New submission from Daniel Kang <[email protected]>: ffmpeg crashes for 4xm files that initialize the wrong number of tracks. When this happens, ffmpeg will read in the data to one track, but will not use the correct track information while decoding. The patch attached adds a check to see if a track is initialized before decoding.
gdb run:
(gdb) r -i ../fuzzed.4xm -f null /dev/null
Starting program: /afs/csl.tjhsst.edu/students/2011/2011dkang/ffmpeg/ffmpeg_g -i
../fuzzed.4xm -f null /dev/null
[Thread debugging using libthread_db enabled]
FFmpeg version git-df9c3fd, Copyright (c) 2000-2011 the FFmpeg developers
built on Jan 9 2011 23:28:35 with gcc 4.4.5
configuration: --enable-gpl
libavutil 50.36. 0 / 50.36. 0
libavcore 0.16. 0 / 0.16. 0
libavcodec 52.108. 0 / 52.108. 0
libavformat 52.92. 0 / 52.92. 0
libavdevice 52. 2. 3 / 52. 2. 3
libavfilter 1.72. 0 / 1.72. 0
libswscale 0.12. 0 / 0.12. 0
Program received signal SIGFPE, Arithmetic exception.
0x00000000004e070e in fourxm_read_packet (s=0x1202510, pkt=0x7fffffffd070) at
libavformat/4xm.c:308
308 audio_frame_count /=
(gdb) bt
#0 0x00000000004e070e in fourxm_read_packet (s=0x1202510, pkt=0x7fffffffd070)
at libavformat/4xm.c:308
#1 0x00000000004d3f89 in av_read_packet (s=0x1202510, pkt=0x7fffffffd070) at
libavformat/utils.c:701
#2 0x00000000004d5d29 in av_read_frame_internal (s=0x1202510,
pkt=0x7fffffffd380) at libavformat/utils.c:1141
#3 0x00000000004d6ce5 in av_find_stream_info (ic=0x1202510) at
libavformat/utils.c:2287
#4 0x000000000043175b in opt_input_file (filename=0x7fffffffdaf4
"../fuzzed.4xm") at ffmpeg.c:3214
#5 0x000000000043b91c in parse_options (argc=6, argv=0x7fffffffd748,
options=<value optimized out>, parse_arg_function=0x438330 <opt_output_file>) at
cmdutils.c:208
#6 0x0000000000437922 in main (argc=6, argv=0x7fffffffd748) at ffmpeg.c:4345
(gdb) disass $pc-32 $pc+32
A syntax error in expression, near `$pc+32'.
(gdb) info all-registers
rax 0x140 320
rbx 0x7ffff7eb0010 140737352761360
rcx 0x140 320
rdx 0x0 0
rsi 0x140 320
rdi 0x7fffffffd070 140737488343152
rbp 0x120b5b0 0x120b5b0
rsp 0x7fffffffcf70 0x7fffffffcf70
r8 0x220a22a220a20a20 2452811026784193056
r9 0x220a0a222220a0a8 2452784088774385832
r10 0x20a2229a20a220a2 2351480000808624290
r11 0x11007 69639
r12 0x7fffffffd070 140737488343152
r13 0x12035a0 18888096
r14 0x1202510 18883856
r15 0x140 320
rip 0x4e070e 0x4e070e <fourxm_read_packet+542>
eflags 0x10246 [ PF ZF IF RF ]
cs 0x33 51
ss 0x2b 43
ds 0x0 0
es 0x0 0
fs 0x0 0
gs 0x0 0
st0 0 (raw 0x00000000000000000000)
st1 0 (raw 0x00000000000000000000)
st2 0 (raw 0x00000000000000000000)
st3 0 (raw 0x00000000000000000000)
st4 0 (raw 0x00000000000000000000)
st5 0 (raw 0x00000000000000000000)
st6 0 (raw 0x00000000000000000000)
st7 0 (raw 0x00000000000000000000)
fctrl 0x37f 895
fstat 0x0 0
ftag 0xffff 65535
fiseg 0x0 0
fioff 0x0 0
foseg 0x0 0
fooff 0x0 0
fop 0x0 0
xmm0 {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0},
v16_int8 = {0x0 <repeats 16 times>}, v8_int16 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0},
v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, uint128 =
0x00000000000000000000000000000000}
xmm1 {v4_float = {0x0, 0x1, 0x0, 0x0}, v2_double = {0x1,
0x8000000000000000}, v16_int8 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xf0, 0x3f, 0xff,
0xff, 0xff, 0xff,
---Type <return> to continue, or q <return> to quit---
0xff, 0xff, 0xff, 0xff}, v8_int16 = {0x0, 0x0, 0x0, 0x3ff0, 0xffff, 0xffff,
0xffff, 0xffff}, v4_int32 = {0x0, 0x3ff00000, 0xffffffff, 0xffffffff}, v2_int64
= {
0x3ff0000000000000, 0xffffffffffffffff}, uint128 =
0xffffffffffffffff3ff0000000000000}
xmm2 {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0},
v16_int8 = {0x0 <repeats 16 times>}, v8_int16 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0},
v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, uint128 =
0x00000000000000000000000000000000}
xmm3 {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0},
v16_int8 = {0x65, 0x0 <repeats 15 times>}, v8_int16 = {0x65, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0,
0x0}, v4_int32 = {0x65, 0x0, 0x0, 0x0}, v2_int64 = {0x65, 0x0}, uint128 =
0x00000000000000000000000000000065}
xmm4 {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0,
0x8000000000000000}, v16_int8 = {0x73, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x54,
0x72, 0x69, 0x65,
0x64, 0x20, 0x74, 0x6f}, v8_int16 = {0x73, 0x0, 0x0, 0x0, 0x7254, 0x6569,
0x2064, 0x6f74}, v4_int32 = {0x73, 0x0, 0x65697254, 0x6f742064}, v2_int64 =
{0x73,
0x6f74206465697254}, uint128 = 0x6f742064656972540000000000000073}
xmm5 {v4_float = {0x0, 0x1, 0x0, 0x0}, v2_double = {0x0, 0x0},
v16_int8 = {0x0, 0x0, 0x0, 0xe0, 0x95, 0x9c, 0xe7, 0x3f, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0,
0x0}, v8_int16 = {0x0, 0xe000, 0x9c95, 0x3fe7, 0x0, 0x0, 0x0, 0x0}, v4_int32
= {0xe0000000, 0x3fe79c95, 0x0, 0x0}, v2_int64 = {0x3fe79c95e0000000, 0x0},
uint128 = 0x00000000000000003fe79c95e0000000}
xmm6 {v4_float = {0x0, 0x1, 0x0, 0x0}, v2_double = {0x1, 0x0},
v16_int8 = {0x6d, 0x7d, 0xbf, 0xbb, 0x27, 0xaf, 0xf5, 0x3f, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0,
0x0, 0x0}, v8_int16 = {0x7d6d, 0xbbbf, 0xaf27, 0x3ff5, 0x0, 0x0, 0x0, 0x0},
v4_int32 = {0xbbbf7d6d, 0x3ff5af27, 0x0, 0x0}, v2_int64 = {0x3ff5af27bbbf7d6d,
0x0},
uint128 = 0x00000000000000003ff5af27bbbf7d6d}
xmm7 {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0},
v16_int8 = {0x0, 0x0, 0x0, 0x0, 0x68, 0xc8, 0xbc, 0x3b, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0,
0x0}, v8_int16 = {0x0, 0x0, 0xc868, 0x3bbc, 0x0, 0x0, 0x0, 0x0}, v4_int32 =
{0x0, 0x3bbcc868, 0x0, 0x0}, v2_int64 = {0x3bbcc86800000000, 0x0},
uint128 = 0x00000000000000003bbcc86800000000}
xmm8 {v4_float = {0x0, 0xfffffffd, 0x0, 0x0}, v2_double =
{0xffffffffffffffd2, 0x0}, v16_int8 = {0xe0, 0xe6, 0x35, 0x67, 0x9e, 0x6, 0x47,
0xc0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v8_int16 = {0xe6e0, 0x6735, 0x69e, 0xc047,
0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x6735e6e0, 0xc047069e, 0x0, 0x0}, v2_int64 = {
0xc047069e6735e6e0, 0x0}, uint128 = 0x0000000000000000c047069e6735e6e0}
xmm9 {v4_float = {0x0, 0x1, 0x0, 0x0}, v2_double = {0x1, 0x0},
v16_int8 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xf0, 0x3f, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0,
0x0}, v8_int16 = {0x0, 0x0, 0x0, 0x3ff0, 0x0, 0x0, 0x0, 0x0}, v4_int32 =
{0x0, 0x3ff00000, 0x0, 0x0}, v2_int64 = {0x3ff0000000000000, 0x0},
uint128 = 0x00000000000000003ff0000000000000}
xmm10 {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0},
v16_int8 = {0x0, 0x0, 0x46, 0x84, 0x24, 0x59, 0xd6, 0x3e, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0,
0x0}, v8_int16 = {0x0, 0x8446, 0x5924, 0x3ed6, 0x0, 0x0, 0x0, 0x0}, v4_int32
= {0x84460000, 0x3ed65924, 0x0, 0x0}, v2_int64 = {0x3ed6592484460000, 0x0},
uint128 = 0x00000000000000003ed6592484460000}
xmm11 {v4_float = {0x9689a800, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0},
v16_int8 = {0x6a, 0xa2, 0x65, 0x50, 0xf2, 0xea, 0x8f, 0xbd, 0x0, 0x0, 0x0, 0x0,
0x0,
0x0, 0x0, 0x0}, v8_int16 = {0xa26a, 0x5065, 0xeaf2, 0xbd8f, 0x0, 0x0, 0x0,
0x0}, v4_int32 = {0x5065a26a, 0xbd8feaf2, 0x0, 0x0}, v2_int64 =
{0xbd8feaf25065a26a,
0x0}, uint128 = 0x0000000000000000bd8feaf25065a26a}
xmm12 {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0},
v16_int8 = {0x29, 0xf2, 0x88, 0x6c, 0xa6, 0x49, 0xde, 0x3e, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0,
0x0, 0x0}, v8_int16 = {0xf229, 0x6c88, 0x49a6, 0x3ede, 0x0, 0x0, 0x0, 0x0},
v4_int32 = {0x6c88f229, 0x3ede49a6, 0x0, 0x0}, v2_int64 = {0x3ede49a66c88f229,
0x0},
uint128 = 0x00000000000000003ede49a66c88f229}
xmm13 {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0},
v16_int8 = {0xb3, 0x12, 0x58, 0x17, 0x64, 0x46, 0xe6, 0x3b, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0,
0x0, 0x0}, v8_int16 = {0x12b3, 0x1758, 0x4664, 0x3be6, 0x0, 0x0, 0x0, 0x0},
v4_int32 = {0x175812b3, 0x3be64664, 0x0, 0x0}, v2_int64 = {0x3be64664175812b3,
0x0},
uint128 = 0x00000000000000003be64664175812b3}
xmm14 {v4_float = {0x0, 0x3, 0x0, 0x0}, v2_double = {0x2d, 0x0},
v16_int8 = {0xc0, 0x9, 0xf2, 0x16, 0xb5, 0xdf, 0x46, 0x40, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0,
0x0, 0x0}, v8_int16 = {0x9c0, 0x16f2, 0xdfb5, 0x4046, 0x0, 0x0, 0x0, 0x0},
v4_int32 = {0x16f209c0, 0x4046dfb5, 0x0, 0x0}, v2_int64 = {0x4046dfb516f209c0,
0x0},
uint128 = 0x00000000000000004046dfb516f209c0}
xmm15 {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0},
v16_int8 = {0x0 <repeats 16 times>}, v8_int16 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x0, 0x0},
v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, uint128 =
0x00000000000000000000000000000000}
mxcsr 0x1fa0 [ PE IM DM ZM OM UM PM ]
----------
files: 4xm_init_check.diff
messages: 13338
priority: normal
status: open
substatus: open
title: ffmpeg crashes on 4xm files with invalid headers
type: bug
________________________________________________
FFmpeg issue tracker <[email protected]>
<https://roundup.ffmpeg.org/issue2527>
________________________________________________
4xm_init_check.diff
Description: Binary data
