diff options
| author | Michael Niedermayer <michaelni@gmx.at> | 2014-11-25 13:53:06 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2014-11-30 21:40:36 +0100 |
| commit | 8524009161b0430ba961a4e6fcd8125a695edd7c (patch) | |
| tree | e9bb2ce3147fd498e76c0590a10dd6e78b706a3c | |
| parent | 47f345de1dd25178f82f3da68fc584050d3f0ad2 (diff) | |
| download | ffmpeg-8524009161b0430ba961a4e6fcd8125a695edd7c.tar.gz | |
avcodec/mjpegdec: Fix context fields becoming inconsistent
Fixes out of array access
Fixes: asan_heap-oob_1ca4f85_2760_cov_144449187_miss_congeniality_pegasus_ljpg.avi
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 0eecf40935b22644e6cd74c586057237ecfd6844)
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
| -rw-r--r-- | libavcodec/mjpegdec.c | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/libavcodec/mjpegdec.c b/libavcodec/mjpegdec.c index 2cf55fd877..5fdf9be221 100644 --- a/libavcodec/mjpegdec.c +++ b/libavcodec/mjpegdec.c @@ -1596,6 +1596,8 @@ static int mjpeg_decode_app(MJpegDecodeContext *s) } if (id == AV_RB32("LJIF")) { + int rgb = s->rgb; + int pegasus_rct = s->pegasus_rct; if (s->avctx->debug & FF_DEBUG_PICT_INFO) av_log(s->avctx, AV_LOG_INFO, "Pegasus lossless jpeg header found\n"); @@ -1605,17 +1607,27 @@ static int mjpeg_decode_app(MJpegDecodeContext *s) skip_bits(&s->gb, 16); /* unknown always 0? */ switch (i=get_bits(&s->gb, 8)) { case 1: - s->rgb = 1; - s->pegasus_rct = 0; + rgb = 1; + pegasus_rct = 0; break; case 2: - s->rgb = 1; - s->pegasus_rct = 1; + rgb = 1; + pegasus_rct = 1; break; default: av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace %d\n", i); } + len -= 9; + if (s->got_picture) + if (rgb != s->rgb || pegasus_rct != s->pegasus_rct) { + av_log(s->avctx, AV_LOG_WARNING, "Mismatching LJIF tag\n"); + goto out; + } + + s->rgb = rgb; + s->pegasus_rct = pegasus_rct; + goto out; } if (id == AV_RL32("colr") && len > 0) { |