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Heap buffer overflow #3506

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clayton-shopify opened this issue Mar 14, 2017 · 0 comments
Closed

Heap buffer overflow #3506

clayton-shopify opened this issue Mar 14, 2017 · 0 comments

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@clayton-shopify
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The following input demonstrates a crash:

def to_str
  ``
  0
end

0.times.inspect

Since backquotes are not implemented, this code should result in infinite recursion but it crashes well before the C stack overflows. An attempt is made to write past the end of the Ruby VM stack here:

mruby/src/vm.c

Line 1205 in 4b1e5d4

SET_NIL_VALUE(regs[bidx]);

This suggests that the size of the VM stack was not calculated correctly at some previous point.

ASAN report:

==30916==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x62700001b908 at pc 0x00010213cf0f bp 0x7fff5d8fd890 sp 0x7fff5d8fd888
WRITE of size 4 at 0x62700001b908 thread T0
    #0 0x10213cf0e in mrb_vm_exec (mruby+0x10016ef0e)
    #1 0x102133f99 in mrb_vm_run (mruby+0x100165f99)
    #2 0x10212d01e in mrb_run (mruby+0x10015f01e)
    #3 0x10212a967 in mrb_funcall_with_block (mruby+0x10015c967)
    #4 0x102127337 in mrb_funcall_argv (mruby+0x100159337)
    #5 0x1020acc9e in convert_type (mruby+0x1000dec9e)
    #6 0x1020addba in mrb_check_convert_type (mruby+0x1000dfdba)
    #7 0x1020dbb9d in mrb_check_string_type (mruby+0x10010db9d)
    #8 0x1020779c3 in mrb_f_raise (mruby+0x1000a99c3)
    #9 0x10213eb73 in mrb_vm_exec (mruby+0x100170b73)
    #10 0x102133f99 in mrb_vm_run (mruby+0x100165f99)
    #11 0x10212d01e in mrb_run (mruby+0x10015f01e)
    #12 0x10212a967 in mrb_funcall_with_block (mruby+0x10015c967)
    #13 0x102127337 in mrb_funcall_argv (mruby+0x100159337)
    #14 0x1020acc9e in convert_type (mruby+0x1000dec9e)
    #15 0x1020addba in mrb_check_convert_type (mruby+0x1000dfdba)
    #16 0x1020dbb9d in mrb_check_string_type (mruby+0x10010db9d)
    #17 0x1020779c3 in mrb_f_raise (mruby+0x1000a99c3)
    #18 0x10213eb73 in mrb_vm_exec (mruby+0x100170b73)
    #19 0x102133f99 in mrb_vm_run (mruby+0x100165f99)
    #20 0x10212d01e in mrb_run (mruby+0x10015f01e)
    #21 0x10212a967 in mrb_funcall_with_block (mruby+0x10015c967)
    #22 0x102127337 in mrb_funcall_argv (mruby+0x100159337)
    #23 0x1020acc9e in convert_type (mruby+0x1000dec9e)
    #24 0x1020addba in mrb_check_convert_type (mruby+0x1000dfdba)
    #25 0x1020dbb9d in mrb_check_string_type (mruby+0x10010db9d)
    #26 0x1020779c3 in mrb_f_raise (mruby+0x1000a99c3)
    #27 0x10213eb73 in mrb_vm_exec (mruby+0x100170b73)
    #28 0x102133f99 in mrb_vm_run (mruby+0x100165f99)
    #29 0x10212d01e in mrb_run (mruby+0x10015f01e)
    #30 0x10212a967 in mrb_funcall_with_block (mruby+0x10015c967)
    #31 0x102127337 in mrb_funcall_argv (mruby+0x100159337)
    #32 0x1020acc9e in convert_type (mruby+0x1000dec9e)
    #33 0x1020addba in mrb_check_convert_type (mruby+0x1000dfdba)
    #34 0x1020dbb9d in mrb_check_string_type (mruby+0x10010db9d)
    #35 0x1020779c3 in mrb_f_raise (mruby+0x1000a99c3)
    #36 0x10213eb73 in mrb_vm_exec (mruby+0x100170b73)
    #37 0x102133f99 in mrb_vm_run (mruby+0x100165f99)
    #38 0x10212d01e in mrb_run (mruby+0x10015f01e)
    #39 0x10212a967 in mrb_funcall_with_block (mruby+0x10015c967)
    #40 0x102127337 in mrb_funcall_argv (mruby+0x100159337)
    #41 0x1020acc9e in convert_type (mruby+0x1000dec9e)
    #42 0x1020addba in mrb_check_convert_type (mruby+0x1000dfdba)
    #43 0x1020dbb9d in mrb_check_string_type (mruby+0x10010db9d)
    #44 0x1020779c3 in mrb_f_raise (mruby+0x1000a99c3)
    #45 0x10213eb73 in mrb_vm_exec (mruby+0x100170b73)
    #46 0x102133f99 in mrb_vm_run (mruby+0x100165f99)
    #47 0x10212d01e in mrb_run (mruby+0x10015f01e)
    #48 0x10212a967 in mrb_funcall_with_block (mruby+0x10015c967)
    #49 0x102127337 in mrb_funcall_argv (mruby+0x100159337)
    #50 0x1020acc9e in convert_type (mruby+0x1000dec9e)
    #51 0x1020addba in mrb_check_convert_type (mruby+0x1000dfdba)
    #52 0x1020dbb9d in mrb_check_string_type (mruby+0x10010db9d)
    #53 0x1020779c3 in mrb_f_raise (mruby+0x1000a99c3)
    #54 0x10213eb73 in mrb_vm_exec (mruby+0x100170b73)
    #55 0x102133f99 in mrb_vm_run (mruby+0x100165f99)
    #56 0x10212d01e in mrb_run (mruby+0x10015f01e)
    #57 0x10212a967 in mrb_funcall_with_block (mruby+0x10015c967)
    #58 0x102127337 in mrb_funcall_argv (mruby+0x100159337)
    #59 0x1020acc9e in convert_type (mruby+0x1000dec9e)
    #60 0x1020addba in mrb_check_convert_type (mruby+0x1000dfdba)
    #61 0x1020dbb9d in mrb_check_string_type (mruby+0x10010db9d)
    #62 0x1020779c3 in mrb_f_raise (mruby+0x1000a99c3)
    #63 0x10213eb73 in mrb_vm_exec (mruby+0x100170b73)
    #64 0x102133f99 in mrb_vm_run (mruby+0x100165f99)
    #65 0x10212d01e in mrb_run (mruby+0x10015f01e)
    #66 0x10212a967 in mrb_funcall_with_block (mruby+0x10015c967)
    #67 0x102127337 in mrb_funcall_argv (mruby+0x100159337)
    #68 0x1020acc9e in convert_type (mruby+0x1000dec9e)
    #69 0x1020addba in mrb_check_convert_type (mruby+0x1000dfdba)
    #70 0x1020dbb9d in mrb_check_string_type (mruby+0x10010db9d)
    #71 0x1020779c3 in mrb_f_raise (mruby+0x1000a99c3)
    #72 0x10213eb73 in mrb_vm_exec (mruby+0x100170b73)
    #73 0x102133f99 in mrb_vm_run (mruby+0x100165f99)
    #74 0x10212d01e in mrb_run (mruby+0x10015f01e)
    #75 0x10212a967 in mrb_funcall_with_block (mruby+0x10015c967)
    #76 0x102127337 in mrb_funcall_argv (mruby+0x100159337)
    #77 0x1020acc9e in convert_type (mruby+0x1000dec9e)
    #78 0x1020addba in mrb_check_convert_type (mruby+0x1000dfdba)
    #79 0x1020dbb9d in mrb_check_string_type (mruby+0x10010db9d)
    #80 0x1020779c3 in mrb_f_raise (mruby+0x1000a99c3)
    #81 0x10213eb73 in mrb_vm_exec (mruby+0x100170b73)
    #82 0x102133f99 in mrb_vm_run (mruby+0x100165f99)
    #83 0x10212d01e in mrb_run (mruby+0x10015f01e)
    #84 0x10212a967 in mrb_funcall_with_block (mruby+0x10015c967)
    #85 0x102127337 in mrb_funcall_argv (mruby+0x100159337)
    #86 0x1020acc9e in convert_type (mruby+0x1000dec9e)
    #87 0x1020addba in mrb_check_convert_type (mruby+0x1000dfdba)
    #88 0x1020dbb9d in mrb_check_string_type (mruby+0x10010db9d)
    #89 0x1020779c3 in mrb_f_raise (mruby+0x1000a99c3)
    #90 0x10213eb73 in mrb_vm_exec (mruby+0x100170b73)
    #91 0x102133f99 in mrb_vm_run (mruby+0x100165f99)
    #92 0x10212d01e in mrb_run (mruby+0x10015f01e)
    #93 0x10212a967 in mrb_funcall_with_block (mruby+0x10015c967)
    #94 0x102127337 in mrb_funcall_argv (mruby+0x100159337)
    #95 0x1020acc9e in convert_type (mruby+0x1000dec9e)
    #96 0x1020addba in mrb_check_convert_type (mruby+0x1000dfdba)
    #97 0x1020dbb9d in mrb_check_string_type (mruby+0x10010db9d)
    #98 0x1020779c3 in mrb_f_raise (mruby+0x1000a99c3)
    #99 0x10213eb73 in mrb_vm_exec (mruby+0x100170b73)
    #100 0x102133f99 in mrb_vm_run (mruby+0x100165f99)
    #101 0x10212d01e in mrb_run (mruby+0x10015f01e)
    #102 0x10212a967 in mrb_funcall_with_block (mruby+0x10015c967)
    #103 0x102127337 in mrb_funcall_argv (mruby+0x100159337)
    #104 0x1020acc9e in convert_type (mruby+0x1000dec9e)
    #105 0x1020addba in mrb_check_convert_type (mruby+0x1000dfdba)
    #106 0x1020dbb9d in mrb_check_string_type (mruby+0x10010db9d)
    #107 0x1020779c3 in mrb_f_raise (mruby+0x1000a99c3)
    #108 0x10213eb73 in mrb_vm_exec (mruby+0x100170b73)
    #109 0x102133f99 in mrb_vm_run (mruby+0x100165f99)
    #110 0x10212d01e in mrb_run (mruby+0x10015f01e)
    #111 0x10212a967 in mrb_funcall_with_block (mruby+0x10015c967)
    #112 0x102127337 in mrb_funcall_argv (mruby+0x100159337)
    #113 0x1020acc9e in convert_type (mruby+0x1000dec9e)
    #114 0x1020addba in mrb_check_convert_type (mruby+0x1000dfdba)
    #115 0x1020dbb9d in mrb_check_string_type (mruby+0x10010db9d)
    #116 0x1020779c3 in mrb_f_raise (mruby+0x1000a99c3)
    #117 0x10213eb73 in mrb_vm_exec (mruby+0x100170b73)
    #118 0x102133f99 in mrb_vm_run (mruby+0x100165f99)
    #119 0x10212d01e in mrb_run (mruby+0x10015f01e)
    #120 0x10212a967 in mrb_funcall_with_block (mruby+0x10015c967)
    #121 0x102127337 in mrb_funcall_argv (mruby+0x100159337)
    #122 0x1020acc9e in convert_type (mruby+0x1000dec9e)
    #123 0x1020addba in mrb_check_convert_type (mruby+0x1000dfdba)
    #124 0x1020dbb9d in mrb_check_string_type (mruby+0x10010db9d)
    #125 0x1020779c3 in mrb_f_raise (mruby+0x1000a99c3)
    #126 0x10213eb73 in mrb_vm_exec (mruby+0x100170b73)
    #127 0x102133f99 in mrb_vm_run (mruby+0x100165f99)
    #128 0x10212d01e in mrb_run (mruby+0x10015f01e)
    #129 0x10212a967 in mrb_funcall_with_block (mruby+0x10015c967)
    #130 0x102127337 in mrb_funcall_argv (mruby+0x100159337)
    #131 0x1020acc9e in convert_type (mruby+0x1000dec9e)
    #132 0x1020addba in mrb_check_convert_type (mruby+0x1000dfdba)
    #133 0x1020dbb9d in mrb_check_string_type (mruby+0x10010db9d)
    #134 0x1020779c3 in mrb_f_raise (mruby+0x1000a99c3)
    #135 0x10213eb73 in mrb_vm_exec (mruby+0x100170b73)
    #136 0x102133f99 in mrb_vm_run (mruby+0x100165f99)
    #137 0x10212d01e in mrb_run (mruby+0x10015f01e)
    #138 0x10212a967 in mrb_funcall_with_block (mruby+0x10015c967)
    #139 0x102127337 in mrb_funcall_argv (mruby+0x100159337)
    #140 0x1020acc9e in convert_type (mruby+0x1000dec9e)
    #141 0x1020addba in mrb_check_convert_type (mruby+0x1000dfdba)
    #142 0x1020dbb9d in mrb_check_string_type (mruby+0x10010db9d)
    #143 0x1020779c3 in mrb_f_raise (mruby+0x1000a99c3)
    #144 0x10213eb73 in mrb_vm_exec (mruby+0x100170b73)
    #145 0x102133f99 in mrb_vm_run (mruby+0x100165f99)
    #146 0x10212d01e in mrb_run (mruby+0x10015f01e)
    #147 0x10212a967 in mrb_funcall_with_block (mruby+0x10015c967)
    #148 0x102127337 in mrb_funcall_argv (mruby+0x100159337)
    #149 0x1020acc9e in convert_type (mruby+0x1000dec9e)
    #150 0x1020addba in mrb_check_convert_type (mruby+0x1000dfdba)
    #151 0x1020dbb9d in mrb_check_string_type (mruby+0x10010db9d)
    #152 0x1020779c3 in mrb_f_raise (mruby+0x1000a99c3)
    #153 0x10213eb73 in mrb_vm_exec (mruby+0x100170b73)
    #154 0x102133f99 in mrb_vm_run (mruby+0x100165f99)
    #155 0x10212d01e in mrb_run (mruby+0x10015f01e)
    #156 0x10212a967 in mrb_funcall_with_block (mruby+0x10015c967)
    #157 0x102127337 in mrb_funcall_argv (mruby+0x100159337)
    #158 0x1020acc9e in convert_type (mruby+0x1000dec9e)
    #159 0x1020addba in mrb_check_convert_type (mruby+0x1000dfdba)
    #160 0x1020dbb9d in mrb_check_string_type (mruby+0x10010db9d)
    #161 0x1020779c3 in mrb_f_raise (mruby+0x1000a99c3)
    #162 0x10213eb73 in mrb_vm_exec (mruby+0x100170b73)
    #163 0x102133f99 in mrb_vm_run (mruby+0x100165f99)
    #164 0x10212d01e in mrb_run (mruby+0x10015f01e)
    #165 0x10212a967 in mrb_funcall_with_block (mruby+0x10015c967)
    #166 0x102127337 in mrb_funcall_argv (mruby+0x100159337)
    #167 0x1020acc9e in convert_type (mruby+0x1000dec9e)
    #168 0x1020addba in mrb_check_convert_type (mruby+0x1000dfdba)
    #169 0x1020dbb9d in mrb_check_string_type (mruby+0x10010db9d)
    #170 0x1020779c3 in mrb_f_raise (mruby+0x1000a99c3)
    #171 0x10213eb73 in mrb_vm_exec (mruby+0x100170b73)
    #172 0x102133f99 in mrb_vm_run (mruby+0x100165f99)
    #173 0x10212d01e in mrb_run (mruby+0x10015f01e)
    #174 0x10212a967 in mrb_funcall_with_block (mruby+0x10015c967)
    #175 0x102127337 in mrb_funcall_argv (mruby+0x100159337)
    #176 0x1020acc9e in convert_type (mruby+0x1000dec9e)
    #177 0x1020addba in mrb_check_convert_type (mruby+0x1000dfdba)
    #178 0x1020dbb9d in mrb_check_string_type (mruby+0x10010db9d)
    #179 0x1020779c3 in mrb_f_raise (mruby+0x1000a99c3)
    #180 0x10213eb73 in mrb_vm_exec (mruby+0x100170b73)
    #181 0x102133f99 in mrb_vm_run (mruby+0x100165f99)
    #182 0x10212d01e in mrb_run (mruby+0x10015f01e)
    #183 0x10212a967 in mrb_funcall_with_block (mruby+0x10015c967)
    #184 0x102127337 in mrb_funcall_argv (mruby+0x100159337)
    #185 0x1020acc9e in convert_type (mruby+0x1000dec9e)
    #186 0x1020addba in mrb_check_convert_type (mruby+0x1000dfdba)
    #187 0x1020dbb9d in mrb_check_string_type (mruby+0x10010db9d)
    #188 0x1020779c3 in mrb_f_raise (mruby+0x1000a99c3)
    #189 0x10213eb73 in mrb_vm_exec (mruby+0x100170b73)
    #190 0x102133f99 in mrb_vm_run (mruby+0x100165f99)
    #191 0x10212d01e in mrb_run (mruby+0x10015f01e)
    #192 0x10212a967 in mrb_funcall_with_block (mruby+0x10015c967)
    #193 0x102127337 in mrb_funcall_argv (mruby+0x100159337)
    #194 0x1020acc9e in convert_type (mruby+0x1000dec9e)
    #195 0x1020addba in mrb_check_convert_type (mruby+0x1000dfdba)
    #196 0x1020dbb9d in mrb_check_string_type (mruby+0x10010db9d)
    #197 0x1020779c3 in mrb_f_raise (mruby+0x1000a99c3)
    #198 0x10213eb73 in mrb_vm_exec (mruby+0x100170b73)
    #199 0x102133f99 in mrb_vm_run (mruby+0x100165f99)
    #200 0x10212d01e in mrb_run (mruby+0x10015f01e)
    #201 0x10212a967 in mrb_funcall_with_block (mruby+0x10015c967)
    #202 0x102127337 in mrb_funcall_argv (mruby+0x100159337)
    #203 0x1020acc9e in convert_type (mruby+0x1000dec9e)
    #204 0x1020addba in mrb_check_convert_type (mruby+0x1000dfdba)
    #205 0x1020dbb9d in mrb_check_string_type (mruby+0x10010db9d)
    #206 0x1020779c3 in mrb_f_raise (mruby+0x1000a99c3)
    #207 0x10213eb73 in mrb_vm_exec (mruby+0x100170b73)
    #208 0x102133f99 in mrb_vm_run (mruby+0x100165f99)
    #209 0x10212d01e in mrb_run (mruby+0x10015f01e)
    #210 0x10212a967 in mrb_funcall_with_block (mruby+0x10015c967)
    #211 0x102127337 in mrb_funcall_argv (mruby+0x100159337)
    #212 0x1020acc9e in convert_type (mruby+0x1000dec9e)
    #213 0x1020addba in mrb_check_convert_type (mruby+0x1000dfdba)
    #214 0x1020dbb9d in mrb_check_string_type (mruby+0x10010db9d)
    #215 0x1020779c3 in mrb_f_raise (mruby+0x1000a99c3)
    #216 0x10213eb73 in mrb_vm_exec (mruby+0x100170b73)
    #217 0x102133f99 in mrb_vm_run (mruby+0x100165f99)
    #218 0x10212d01e in mrb_run (mruby+0x10015f01e)
    #219 0x10212a967 in mrb_funcall_with_block (mruby+0x10015c967)
    #220 0x102127337 in mrb_funcall_argv (mruby+0x100159337)
    #221 0x1020acc9e in convert_type (mruby+0x1000dec9e)
    #222 0x1020addba in mrb_check_convert_type (mruby+0x1000dfdba)
    #223 0x1020dbb9d in mrb_check_string_type (mruby+0x10010db9d)
    #224 0x1020779c3 in mrb_f_raise (mruby+0x1000a99c3)
    #225 0x10213eb73 in mrb_vm_exec (mruby+0x100170b73)
    #226 0x102133f99 in mrb_vm_run (mruby+0x100165f99)
    #227 0x10212d01e in mrb_run (mruby+0x10015f01e)
    #228 0x10212a967 in mrb_funcall_with_block (mruby+0x10015c967)
    #229 0x102127337 in mrb_funcall_argv (mruby+0x100159337)
    #230 0x1020acc9e in convert_type (mruby+0x1000dec9e)
    #231 0x1020addba in mrb_check_convert_type (mruby+0x1000dfdba)
    #232 0x1020dbb9d in mrb_check_string_type (mruby+0x10010db9d)
    #233 0x1020779c3 in mrb_f_raise (mruby+0x1000a99c3)
    #234 0x10213eb73 in mrb_vm_exec (mruby+0x100170b73)
    #235 0x102133f99 in mrb_vm_run (mruby+0x100165f99)
    #236 0x10212d01e in mrb_run (mruby+0x10015f01e)
    #237 0x10212a967 in mrb_funcall_with_block (mruby+0x10015c967)
    #238 0x102127337 in mrb_funcall_argv (mruby+0x100159337)
    #239 0x1020acc9e in convert_type (mruby+0x1000dec9e)
    #240 0x1020addba in mrb_check_convert_type (mruby+0x1000dfdba)
    #241 0x1020dbb9d in mrb_check_string_type (mruby+0x10010db9d)
    #242 0x1020779c3 in mrb_f_raise (mruby+0x1000a99c3)
    #243 0x10213eb73 in mrb_vm_exec (mruby+0x100170b73)
    #244 0x102133f99 in mrb_vm_run (mruby+0x100165f99)
    #245 0x10212d01e in mrb_run (mruby+0x10015f01e)
    #246 0x10212a967 in mrb_funcall_with_block (mruby+0x10015c967)
    #247 0x102127337 in mrb_funcall_argv (mruby+0x100159337)
    #248 0x1020acc9e in convert_type (mruby+0x1000dec9e)
    #249 0x1020addba in mrb_check_convert_type (mruby+0x1000dfdba)
    #250 0x1020dbb9d in mrb_check_string_type (mruby+0x10010db9d)
    #251 0x1020779c3 in mrb_f_raise (mruby+0x1000a99c3)
    #252 0x10213eb73 in mrb_vm_exec (mruby+0x100170b73)
    #253 0x102133f99 in mrb_vm_run (mruby+0x100165f99)
    #254 0x10212d01e in mrb_run (mruby+0x10015f01e)
    #255 0x10212a967 in mrb_funcall_with_block (mruby+0x10015c967)

0x62700001b908 is located 8 bytes to the right of 12288-byte region [0x627000018900,0x62700001b900)
allocated by thread T0 here:
    #0 0x102379f87 in wrap_realloc (libclang_rt.asan_osx_dynamic.dylib+0x4af87)
    #1 0x1020c9675 in mrb_default_allocf (mruby+0x1000fb675)
    #2 0x10204b228 in mrb_realloc_simple gc.c:201
    #3 0x10204b90e in mrb_realloc gc.c:215
    #4 0x1021670b1 in stack_extend_alloc (mruby+0x1001990b1)
    #5 0x10212c747 in stack_extend (mruby+0x10015e747)
    #6 0x102129484 in mrb_funcall_with_block (mruby+0x10015b484)
    #7 0x10200db49 in mrb_instance_new (mruby+0x10003fb49)
    #8 0x10213eb73 in mrb_vm_exec (mruby+0x100170b73)
    #9 0x102133f99 in mrb_vm_run (mruby+0x100165f99)
    #10 0x10212d01e in mrb_run (mruby+0x10015f01e)
    #11 0x10212a967 in mrb_funcall_with_block (mruby+0x10015c967)
    #12 0x102127337 in mrb_funcall_argv (mruby+0x100159337)
    #13 0x1020acc9e in convert_type (mruby+0x1000dec9e)
    #14 0x1020addba in mrb_check_convert_type (mruby+0x1000dfdba)
    #15 0x1020dbb9d in mrb_check_string_type (mruby+0x10010db9d)
    #16 0x1020779c3 in mrb_f_raise (mruby+0x1000a99c3)
    #17 0x10213eb73 in mrb_vm_exec (mruby+0x100170b73)
    #18 0x102133f99 in mrb_vm_run (mruby+0x100165f99)
    #19 0x10212d01e in mrb_run (mruby+0x10015f01e)
    #20 0x10212a967 in mrb_funcall_with_block (mruby+0x10015c967)
    #21 0x102127337 in mrb_funcall_argv (mruby+0x100159337)
    #22 0x1020acc9e in convert_type (mruby+0x1000dec9e)
    #23 0x1020addba in mrb_check_convert_type (mruby+0x1000dfdba)
    #24 0x1020dbb9d in mrb_check_string_type (mruby+0x10010db9d)
    #25 0x1020779c3 in mrb_f_raise (mruby+0x1000a99c3)
    #26 0x10213eb73 in mrb_vm_exec (mruby+0x100170b73)
    #27 0x102133f99 in mrb_vm_run (mruby+0x100165f99)
    #28 0x10212d01e in mrb_run (mruby+0x10015f01e)
    #29 0x10212a967 in mrb_funcall_with_block (mruby+0x10015c967)

SUMMARY: AddressSanitizer: heap-buffer-overflow (mruby+0x10016ef0e) in mrb_vm_exec
Shadow bytes around the buggy address:
  0x1c4e000036d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x1c4e000036e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x1c4e000036f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x1c4e00003700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x1c4e00003710: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x1c4e00003720: fa[fa]fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x1c4e00003730: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x1c4e00003740: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x1c4e00003750: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x1c4e00003760: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x1c4e00003770: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07
  Heap left redzone:       fa
  Heap right redzone:      fb
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack partial redzone:   f4
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
==30916==ABORTING
Abort trap: 6

This issue was reported by https://hackerone.com/ston3
@matz matz closed this as completed in b2916f1 Mar 17, 2017
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