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avcodec/mjpegdec: Check escape sequence validity

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Fixes assertion failure
Fixes: asan_heap-oob_1c1a4ea_1242_cov_2274415971_TESTcmyk.jpg

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2015-02-04 20:13:18 +01:00
parent 7f02fcd917
commit afa92907f3
1 changed files with 4 additions and 0 deletions
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4
libavcodec/mjpegdec.c
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@ -1901,6 +1901,10 @@ int ff_mjpeg_find_marker(MJpegDecodeContext *s,
put_bits(&pb, 8, x); put_bits(&pb, 8, x);
if (x == 0xFF) { if (x == 0xFF) {
x = src[b++]; x = src[b++];
if (x & 0x80) {
av_log(s->avctx, AV_LOG_WARNING, "Invalid escape sequence\n");
x &= 0x7f;
}
put_bits(&pb, 7, x); put_bits(&pb, 7, x);
bit_count--; bit_count--;
} }