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| author | Michael Niedermayer <michaelni@gmx.at> | 2014-10-03 01:50:27 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2015-03-12 00:47:04 +0100 |
| commit | b5e661bcd2bb4fe771cb2c1e21215c68e6a17665 (patch) | |
| tree | 7a76412cfb0042162921cfc3ad36e25fa431ae2a | |
| parent | 794fcabfe8b8506dbdf33a735318d1a2aecfb150 (diff) | |
| download | ffmpeg-b5e661bcd2bb4fe771cb2c1e21215c68e6a17665.tar.gz | |
avcodec/mjpegdec: check bits per pixel for changes similar to dimensions
Fixes out of array accesses
Fixes: asan_heap-oob_16668e9_2_asan_heap-oob_16668e9_346_miss_congeniality_pegasus_mjpg.avi
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 5c378d6a6df8243f06c87962b873bd563e58cd39)
Conflicts:
libavcodec/mjpegdec.c
(cherry picked from commit 94371a404c663c3dae3d542fa43951567ab67f82)
Conflicts:
libavcodec/mjpegdec.c
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
| -rw-r--r-- | libavcodec/mjpegdec.c | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/libavcodec/mjpegdec.c b/libavcodec/mjpegdec.c index 817636fa47..6d0ec63b95 100644 --- a/libavcodec/mjpegdec.c +++ b/libavcodec/mjpegdec.c @@ -212,16 +212,16 @@ int ff_mjpeg_decode_dht(MJpegDecodeContext *s) int ff_mjpeg_decode_sof(MJpegDecodeContext *s) { - int len, nb_components, i, width, height, pix_fmt_id; + int len, nb_components, i, width, height, bits, pix_fmt_id; /* XXX: verify len field validity */ len = get_bits(&s->gb, 16); - s->bits= get_bits(&s->gb, 8); + bits= get_bits(&s->gb, 8); - if(s->pegasus_rct) s->bits=9; - if(s->bits==9 && !s->pegasus_rct) s->rct=1; //FIXME ugly + if(s->pegasus_rct) bits=9; + if(bits==9 && !s->pegasus_rct) s->rct=1; //FIXME ugly - if (s->bits != 8 && !s->lossless){ + if (bits != 8 && !s->lossless){ av_log(s->avctx, AV_LOG_ERROR, "only 8 bits/component accepted\n"); return -1; } @@ -241,7 +241,7 @@ int ff_mjpeg_decode_sof(MJpegDecodeContext *s) if (nb_components <= 0 || nb_components > MAX_COMPONENTS) return -1; - if (s->ls && !(s->bits <= 8 || nb_components == 1)){ + if (s->ls && !(bits <= 8 || nb_components == 1)){ av_log(s->avctx, AV_LOG_ERROR, "only <= 8 bits/component or 16-bit gray accepted for JPEG-LS\n"); return -1; } @@ -274,11 +274,14 @@ int ff_mjpeg_decode_sof(MJpegDecodeContext *s) /* if different size, realloc/alloc picture */ /* XXX: also check h_count and v_count */ - if (width != s->width || height != s->height) { + if ( width != s->width || height != s->height + || bits != s->bits + ) { av_freep(&s->qscale_table); s->width = width; s->height = height; + s->bits = bits; s->interlaced = 0; /* test interlaced mode */ |