Improper buffer handling resulting in overflow which leads to crash

[adhokshajmishra]

How to trigger:
src/pinfo -m python2 -c 'print "A"*558'

Output
Przemek's Info Viewer v0.6.10
Looking for man page...

Caught signal 11, bye!
pinfo: crash with: No such file or directory

Register Dump
[----------------------------------registers-----------------------------------]
RAX: 0x54 ('T')
RBX: 0x20414141414141 ('AAAAAA ')
RCX: 0x8a0
RDX: 0x10
RSI: 0x0
RDI: 0x7f72f8c7b8a0 --> 0x727245004d524554 ('TERM')
RBP: 0x7fffffffdcf8 --> 0x20414141414141 ('AAAAAA ')
RSP: 0x7fffffffd6b0 --> 0x7f72f8c7b8a0 --> 0x727245004d524554 ('TERM')
RIP: 0x7f72f88bac95 (<getenv+165>: cmp r12w,WORD PTR [rbx])
R8 : 0x0
R9 : 0x20 (' ')
R10: 0x524
R11: 0x7f72f88babf0 (: push r15)
R12: 0x4554 ('TE')
R13: 0x7f72f8c7b8a2 --> 0x726f727245004d52 ('RM')
R14: 0x4
R15: 0x2
EFLAGS: 0x10206 (carry PARITY adjust zero sign trap INTERRUPT direction overflow)
[-------------------------------------code-------------------------------------]

Stack Dump
[------------------------------------stack-------------------------------------]
0000| 0x7fffffffd6b0 --> 0x7f72f8c7b8a0 --> 0x727245004d524554 ('TERM')
0008| 0x7fffffffd6b8 --> 0x0
0016| 0x7fffffffd6c0 --> 0x7fffffffd700 --> 0x7fffffffd9e0 --> 0x7fffffffdbf0 ('A' <repeats 200 times>...)
0024| 0x7fffffffd6c8 --> 0x555555556e90 (<_start>: xor ebp,ebp)
0032| 0x7fffffffd6d0 --> 0x7fffffffdcd0 ('A' <repeats 46 times>, " ")
0040| 0x7fffffffd6d8 --> 0x0
0048| 0x7fffffffd6e0 --> 0x0
0056| 0x7fffffffd6e8 --> 0x7f72f8c4bca1 (<initscr+49>: test rax,rax)
[------------------------------------------------------------------------------]

Call Stack Trace
#0 0x00007f72f88bac95 in getenv () from /usr/lib/libc.so.6
#1 0x00007f72f8c4bca1 in initscr () from /usr/lib/libncursesw.so.6
#2 0x0000555555569d58 in init_curses () at utils.c:285
#3 0x0000555555560ea5 in handlemanual (name=0x7fffffffdad0 'A' <repeats 200 times>...) at manual.c:266
#4 0x00005555555574bb in main (argc=0x3, argv=0x7fffffffdcd8) at pinfo.c:205

I am working on a patch for this, which will be submitted once done.