[FFmpeg-trac] #1206(avformat:open): Controlled EDX in avformat
FFmpeg
trac at avcodec.org
Sat Apr 14 09:23:43 CEST 2012
#1206: Controlled EDX in avformat
-------------------------------------+-------------------------------------
Reporter: daybreak | Owner:
Type: defect | Status: open
Priority: important | Component: avformat
Version: git-master | Resolution:
Keywords: crash | Blocked By:
SIGSEGV mkv | Reproduced by developer: 1
Blocking: |
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Changes (by cehoyos):
* status: new => open
* reproduced: 0 => 1
* component: undetermined => avformat
* priority: normal => important
* version: unspecified => git-master
* keywords: => crash SIGSEGV mkv
Comment:
{{{
(gdb) r -i 243391nosound.mkvtest107.mkv -f null -
Starting program: ffmpeg_g -i 243391nosound.mkvtest107.mkv -f null -
[Thread debugging using libthread_db enabled]
[New Thread 0xb7b6b6c0 (LWP 11511)]
ffmpeg version N-39787-gcca9528 Copyright (c) 2000-2012 the FFmpeg
developers
built on Apr 14 2012 08:48:33 with gcc 4.3.2
configuration: --cc=/usr/local/gcc-4.3.2/bin/gcc --enable-gpl
libavutil 51. 46.100 / 51. 46.100
libavcodec 54. 14.101 / 54. 14.101
libavformat 54. 3.100 / 54. 3.100
libavdevice 53. 4.100 / 53. 4.100
libavfilter 2. 69.101 / 2. 69.101
libswscale 2. 1.100 / 2. 1.100
libswresample 0. 11.100 / 0. 11.100
libpostproc 52. 0.100 / 52. 0.100
[matroska,webm @ 0x8ee3380] Unknown entry 0x233100
[matroska,webm @ 0x8ee3380] Read error
[matroska,webm @ 0x8ee3380] Unknown entry 0x82
Last message repeated 1 times
[matroska,webm @ 0x8ee3380] Unknown entry 0x84
Last message repeated 1 times
[matroska,webm @ 0x8ee3380] Unknown entry 0x233100
[matroska,webm @ 0x8ee3380] Read error
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb7b6b6c0 (LWP 11511)]
avio_rb16 (s=0xbfd45c88) at libavformat/aviobuf.c:459
459 return *s->buf_ptr++;
(gdb) bt
#0 avio_rb16 (s=0xbfd45c88) at libavformat/aviobuf.c:459
#1 0x08105dc5 in matroska_read_header (s=0x8ee3380) at
libavformat/matroskadec.c:1590
#2 0x0818f066 in avformat_open_input (ps=0xbfd45ed4, filename=0xbfd48269
"243391nosound.mkvtest107.mkv",
fmt=0x0, options=0x8e1fcec) at libavformat/utils.c:634
#3 0x080545db in opt_input_file (o=0xbfd45fd0, opt=0xbfd48267 "i",
filename=0xbfd48269 "243391nosound.mkvtest107.mkv") at ffmpeg.c:3777
#4 0x0805f9d2 in parse_option (optctx=0xbfd45fd0, opt=0xbfd48267 "i",
arg=0xbfd48269 "243391nosound.mkvtest107.mkv", options=0x87d96e0) at
cmdutils.c:303
#5 0x0805fd63 in parse_options (optctx=0xbfd45fd0, argc=6,
argv=0xbfd46204, options=0x87d96e0,
parse_arg_function=0x805a580 <opt_output_file>) at cmdutils.c:336
#6 0x08059806 in main (argc=6, argv=0xbfd46204) at ffmpeg.c:5255
(gdb) disass $pc-28 $pc+32
Dump of assembler code from 0x80d9a8b to 0x80d9ac7:
0x080d9a8b: mov $0x0,%edi
0x080d9a90 <avio_rb16+0>: sub $0xc,%esp
0x080d9a93 <avio_rb16+3>: mov %esi,0x8(%esp)
0x080d9a97 <avio_rb16+7>: mov 0x10(%esp),%esi
0x080d9a9b <avio_rb16+11>: mov %ebx,0x4(%esp)
0x080d9a9f <avio_rb16+15>: mov 0xc(%esi),%eax
0x080d9aa2 <avio_rb16+18>: cmp 0x10(%esi),%eax
0x080d9aa5 <avio_rb16+21>: jae 0x80d9ad8 <avio_rb16+72>
0x080d9aa7 <avio_rb16+23>: movzbl (%eax),%ebx
0x080d9aaa <avio_rb16+26>: add $0x1,%eax
0x080d9aad <avio_rb16+29>: mov %eax,0xc(%esi)
0x080d9ab0 <avio_rb16+32>: shl $0x8,%ebx
0x080d9ab3 <avio_rb16+35>: cmp 0x10(%esi),%eax
0x080d9ab6 <avio_rb16+38>: jae 0x80d9ae9 <avio_rb16+89>
0x080d9ab8 <avio_rb16+40>: movzbl (%eax),%edx
0x080d9abb <avio_rb16+43>: add $0x1,%eax
0x080d9abe <avio_rb16+46>: mov %eax,0xc(%esi)
0x080d9ac1 <avio_rb16+49>: mov 0x8(%esp),%esi
0x080d9ac5 <avio_rb16+53>: or %edx,%ebx
(gdb) info register
eax 0x16 22
ecx 0x2e7261 3043937
edx 0x0 0
ebx 0xbfd45c88 -1076601720
esp 0xbfd45bc0 0xbfd45bc0
ebp 0x8ee4340 0x8ee4340
esi 0xbfd45c88 -1076601720
edi 0x15000 86016
eip 0x80d9aa7 0x80d9aa7 <avio_rb16+23>
eflags 0x10283 [ CF SF IF RF ]
cs 0x73 115
ss 0x7b 123
ds 0x7b 123
es 0x7b 123
fs 0x0 0
gs 0x33 51
}}}
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1206#comment:1>
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