Double free security issue

[clod81]

When attempting to parse a file with the following bytes, a double free occurs.
BD 22 5C 0A 0A

Tested on ubuntu, with ruby 2.4.2.

gdb debug:
gdb --batch -q --ex=r --ex 'back' --ex 'disass $pc, $pc+16' --ex 'info reg' --ex 'quit' --args /usr/local/bin/ruby /data/ccsv/ext/test.rb file_containing_crash_bytes 0</dev/null

gdb output:

*** Error in `/usr/local/bin/ruby': double free or corruption (fasttop): 0x0000000002116b80 ***
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x777e5)[0x7fb6195c57e5]
/lib/x86_64-linux-gnu/libc.so.6(+0x8037a)[0x7fb6195ce37a]
/lib/x86_64-linux-gnu/libc.so.6(cfree+0x4c)[0x7fb6195d253c]
/data/ccsv/ext/ccsv.so(+0x2f0d)[0x7fb618d33f0d]
/usr/local/lib/libruby.so.2.4(+0x596a98)[0x7fb61a810a98]
/usr/local/lib/libruby.so.2.4(+0x58869b)[0x7fb61a80269b]
/usr/local/lib/libruby.so.2.4(+0x583741)[0x7fb61a7fd741]
/usr/local/lib/libruby.so.2.4(+0x583510)[0x7fb61a7fd510]
/usr/local/lib/libruby.so.2.4(+0x58319b)[0x7fb61a7fd19b]
/usr/local/lib/libruby.so.2.4(+0x5411bf)[0x7fb61a7bb1bf]
/usr/local/lib/libruby.so.2.4(+0x578756)[0x7fb61a7f2756]
/usr/local/lib/libruby.so.2.4(rb_iseq_eval_main+0x838)[0x7fb61a7f5218]
/usr/local/lib/libruby.so.2.4(ruby_run_node+0x339)[0x7fb61a3ff479]
/usr/local/bin/ruby[0x4011d7]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7fb61956e830]
/usr/local/bin/ruby(_start+0x29)[0x401059]
======= Memory map: ========
00400000-00402000 r-xp 00000000 00:32 300                                /usr/local/bin/ruby
00601000-00602000 r--p 00001000 00:32 300                                /usr/local/bin/ruby
00602000-00603000 rw-p 00002000 00:32 300                                /usr/local/bin/ruby
00603000-00613000 rw-p 00000000 00:00 0 
01dae000-02123000 rw-p 00000000 00:00 0                                  [heap]
7fb614000000-7fb614021000 rw-p 00000000 00:00 0 
7fb614021000-7fb618000000 ---p 00000000 00:00 0 
7fb618b1b000-7fb618b31000 r-xp 00000000 00:32 1495                       /lib/x86_64-linux-gnu/libgcc_s.so.1
7fb618b31000-7fb618d30000 ---p 00016000 00:32 1495                       /lib/x86_64-linux-gnu/libgcc_s.so.1
7fb618d30000-7fb618d31000 rw-p 00015000 00:32 1495                       /lib/x86_64-linux-gnu/libgcc_s.so.1
7fb618d31000-7fb618d35000 r-xp 00000000 00:32 1326                       /data/ccsv/ext/ccsv.so
7fb618d35000-7fb618f34000 ---p 00004000 00:32 1326                       /data/ccsv/ext/ccsv.so
7fb618f34000-7fb618f35000 r--p 00003000 00:32 1326                       /data/ccsv/ext/ccsv.so
7fb618f35000-7fb618f36000 rw-p 00004000 00:32 1326                       /data/ccsv/ext/ccsv.so
7fb618f36000-7fb618f46000 r-xp 00000000 00:32 335                        /usr/local/lib/ruby/2.4.0/x86_64-linux/stringio.so
7fb618f46000-7fb619146000 ---p 00010000 00:32 335                        /usr/local/lib/ruby/2.4.0/x86_64-linux/stringio.so
7fb619146000-7fb619147000 r--p 00010000 00:32 335                        /usr/local/lib/ruby/2.4.0/x86_64-linux/stringio.so
7fb619147000-7fb619148000 rw-p 00011000 00:32 335                        /usr/local/lib/ruby/2.4.0/x86_64-linux/stringio.so
7fb619148000-7fb61914a000 r-xp 00000000 00:32 318                        /usr/local/lib/ruby/2.4.0/x86_64-linux/enc/trans/transdb.so
7fb61914a000-7fb619349000 ---p 00002000 00:32 318                        /usr/local/lib/ruby/2.4.0/x86_64-linux/enc/trans/transdb.so
7fb619349000-7fb61934a000 r--p 00001000 00:32 318                        /usr/local/lib/ruby/2.4.0/x86_64-linux/enc/trans/transdb.so
7fb61934a000-7fb61934b000 rw-p 00002000 00:32 318                        /usr/local/lib/ruby/2.4.0/x86_64-linux/enc/trans/transdb.so
7fb61934b000-7fb61934d000 r-xp 00000000 00:32 316                        /usr/local/lib/ruby/2.4.0/x86_64-linux/enc/encdb.so
7fb61934d000-7fb61954c000 ---p 00002000 00:32 316                        /usr/local/lib/ruby/2.4.0/x86_64-linux/enc/encdb.so
7fb61954c000-7fb61954d000 r--p 00001000 00:32 316                        /usr/local/lib/ruby/2.4.0/x86_64-linux/enc/encdb.so
7fb61954d000-7fb61954e000 rw-p 00002000 00:32 316                        /usr/local/lib/ruby/2.4.0/x86_64-linux/enc/encdb.so
7fb61954e000-7fb61970e000 r-xp 00000000 00:32 43                         /lib/x86_64-linux-gnu/libc-2.23.so
7fb61970e000-7fb61990e000 ---p 001c0000 00:32 43                         /lib/x86_64-linux-gnu/libc-2.23.so
7fb61990e000-7fb619912000 r--p 001c0000 00:32 43                         /lib/x86_64-linux-gnu/libc-2.23.so
7fb619912000-7fb619914000 rw-p 001c4000 00:32 43                         /lib/x86_64-linux-gnu/libc-2.23.so
7fb619914000-7fb619918000 rw-p 00000000 00:00 0 
7fb619918000-7fb619a20000 r-xp 00000000 00:32 139                        /lib/x86_64-linux-gnu/libm-2.23.so
7fb619a20000-7fb619c1f000 ---p 00108000 00:32 139                        /lib/x86_64-linux-gnu/libm-2.23.so
7fb619c1f000-7fb619c20000 r--p 00107000 00:32 139                        /lib/x86_64-linux-gnu/libm-2.23.so
7fb619c20000-7fb619c21000 rw-p 00108000 00:32 139                        /lib/x86_64-linux-gnu/libm-2.23.so
7fb619c21000-7fb619c2a000 r-xp 00000000 00:32 305                        /lib/x86_64-linux-gnu/libcrypt-2.23.so
7fb619c2a000-7fb619e29000 ---p 00009000 00:32 305                        /lib/x86_64-linux-gnu/libcrypt-2.23.so
7fb619e29000-7fb619e2a000 r--p 00008000 00:32 305                        /lib/x86_64-linux-gnu/libcrypt-2.23.so
7fb619e2a000-7fb619e2b000 rw-p 00009000 00:32 305                        /lib/x86_64-linux-gnu/libcrypt-2.23.so
7fb619e2b000-7fb619e59000 rw-p 00000000 00:00 0 
7fb619e59000-7fb619e5c000 r-xp 00000000 00:32 41                         /lib/x86_64-linux-gnu/libdl-2.23.so
7fb619e5c000-7fb61a05b000 ---p 00003000 00:32 41                         /lib/x86_64-linux-gnu/libdl-2.23.so
7fb61a05b000-7fb61a05c000 r--p 00002000 00:32 41                         /lib/x86_64-linux-gnu/libdl-2.23.so
7fb61a05c000-7fb61a05d000 rw-p 00003000 00:32 41                         /lib/x86_64-linux-gnu/libdl-2.23.so
7fb61a05d000-7fb61a075000 r-xp 00000000 00:32 85                         /lib/x86_64-linux-gnu/libpthread-2.23.so
7fb61a075000-7fb61a274000 ---p 00018000 00:32 85                         /lib/x86_64-linux-gnu/libpthread-2.23.so
7fb61a274000-7fb61a275000 r--p 00017000 00:32 85                         /lib/x86_64-linux-gnu/libpthread-2.23.so
7fb61a275000-7fb61a276000 rw-p 00018000 00:32 85                         /lib/x86_64-linux-gnu/libpthread-2.23.so
7fb61a276000-7fb61a27a000 rw-p 00000000 00:00 0 
7fb61a27a000-7fb61a905000 r-xp 00000000 00:32 303                        /usr/local/lib/libruby.so.2.4.2
7fb61a905000-7fb61ab05000 ---p 0068b000 00:32 303                        /usr/local/lib/libruby.so.2.4.2
7fb61ab05000-7fb61ab0b000 r--p 0068b000 00:32 303                        /usr/local/lib/libruby.so.2.4.2
7fb61ab0b000-7fb61ab0e000 rw-p 00691000 00:32 303                        /usr/local/lib/libruby.so.2.4.2
7fb61ab0e000-7fb61ab1e000 rw-p 00000000 00:00 0 
7fb61ab1e000-7fb61ab44000 r-xp 00000000 00:32 36                         /lib/x86_64-linux-gnu/ld-2.23.so
7fb61ac04000-7fb61ad3b000 rw-p 00000000 00:00 0 
7fb61ad3c000-7fb61ad3d000 rw-p 00000000 00:00 0 
7fb61ad3d000-7fb61ad3e000 ---p 00000000 00:00 0 
7fb61ad3e000-7fb61ad43000 rw-p 00000000 00:00 0 
7fb61ad43000-7fb61ad44000 r--p 00025000 00:32 36                         /lib/x86_64-linux-gnu/ld-2.23.so
7fb61ad44000-7fb61ad45000 rw-p 00026000 00:32 36                         /lib/x86_64-linux-gnu/ld-2.23.so
7fb61ad45000-7fb61ad46000 rw-p 00000000 00:00 0 
7ffc1a668000-7ffc1ae67000 rw-p 00000000 00:00 0                          [stack]
7ffc1ae6a000-7ffc1ae6c000 r--p 00000000 00:00 0                          [vvar]
7ffc1ae6c000-7ffc1ae6e000 r-xp 00000000 00:00 0                          [vdso]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                  [vsyscall]
During startup program terminated with signal SIGABRT, Aborted.

[G-Rath]

This has been reported as GHSA-5gxp-c379-pj42 - is it possible get a new release with the fix so we can update?