out-of-bounds write in coders/sgi.c:535:4
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#369 out-of-bounds write in coders/sgi.c:535:4
This bug was found while fuzzing graphicsmagick with afl-fuzz
Tested on hg changeset 44ed8318ba6a+
Command: gm convert id:000117,sig:06,src:000990,op:havoc,rep:32 /dev/null
=================================================================
==18044==ERROR: AddressSanitizer: heap-buffer-overflow on address 0xb5901618 at pc 0x0850bc32 bp 0xbfea9df8 sp 0xbfea9df0
WRITE of size 1 at 0xb5901618 thread T0
#0 0x850bc31 in ReadSGIImage /home/user/Desktop/graphicsmagick/coders/sgi.c:535:4
#1 0x81f84b4 in ReadImage /home/user/Desktop/graphicsmagick/magick/constitute.c:1607:14
#2 0x816fbca in ConvertImageCommand /home/user/Desktop/graphicsmagick/magick/command.c:4348:22
#3 0x8187f6b in MagickCommand /home/user/Desktop/graphicsmagick/magick/command.c:8862:27
#4 0x81cd999 in GMCommandSingle /home/user/Desktop/graphicsmagick/magick/command.c:17338:10
#5 0x81cc6ae in GMCommand /home/user/Desktop/graphicsmagick/magick/command.c:17391:16
#6 0x8139511 in main /home/user/Desktop/graphicsmagick/utilities/gm.c:61:10
#7 0xb749673d in __libc_start_main /build/glibc-tVsQx_/glibc-2.21/csu/libc-start.c:289
#8 0x807fd9b in _start (/home/user/Desktop/graphicsmagick/utilities/gm+0x807fd9b)
0xb5901618 is located 0 bytes to the right of 56-byte region [0xb59015e0,0xb5901618)
allocated by thread T0 here:
#0 0x8117a29 in malloc (/home/user/Desktop/graphicsmagick/utilities/gm+0x8117a29)
#1 0x827e984 in MagickMalloc /home/user/Desktop/graphicsmagick/magick/memory.c:156:11
#2 0x81f84b4 in ReadImage /home/user/Desktop/graphicsmagick/magick/constitute.c:1607:14
#3 0x816fbca in ConvertImageCommand /home/user/Desktop/graphicsmagick/magick/command.c:4348:22
#4 0x8187f6b in MagickCommand /home/user/Desktop/graphicsmagick/magick/command.c:8862:27
#5 0x81cd999 in GMCommandSingle /home/user/Desktop/graphicsmagick/magick/command.c:17338:10
#6 0x81cc6ae in GMCommand /home/user/Desktop/graphicsmagick/magick/command.c:17391:16
#7 0x8139511 in main /home/user/Desktop/graphicsmagick/utilities/gm.c:61:10
SUMMARY: AddressSanitizer: heap-buffer-overflow /home/user/Desktop/graphicsmagick/coders/sgi.c:535 ReadSGIImage
Shadow bytes around the buggy address:
0x36b20270: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x36b20280: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x36b20290: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x36b202a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x36b202b0: fa fa fa fa fa fa fa fa fa fa fa fa 00 00 00 00
=>0x36b202c0: 00 00 00[fa]fa fa fa fa 00 00 00 00 00 00 00 fa
0x36b202d0: fa fa fa fa 00 00 00 00 00 00 00 00 fa fa fa fa
0x36b202e0: 00 00 00 00 00 00 00 fa fa fa fa fa 00 00 00 00
0x36b202f0: 00 00 00 04 fa fa fa fa 00 00 00 00 00 00 00 04
0x36b20300: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x36b20310: 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
==18044==ABORTING
Diff:
Fixed by Mercurial changeset 14751:74ff7c15c946