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| author | Michael Niedermayer <michael@niedermayer.cc> | 2015-11-04 21:27:04 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2015-11-04 21:51:21 +0100 |
| commit | cc35f6f4768ffe57cc4fcfa56ecb89aee409e3d5 (patch) | |
| tree | 4c27d031246c5877c4af814d2aabc15d3cb7a2d6 /libavcodec/mjpegdec.c | |
| parent | d24888ef19ba38b787b11d1ee091a3d94920c76a (diff) | |
| download | ffmpeg-cc35f6f4768ffe57cc4fcfa56ecb89aee409e3d5.tar.gz | |
avcodec/mjpegdec: Reinitialize IDCT on BPP changes
Fixes misaligned access
Fixes: dc9262a469f6f315f74c087a7b3a7f35/signal_sigsegv_2e95bcd_9_9c0f9f4a9ba82aa9b3ab2b91ce4d5277.jpg
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Diffstat (limited to 'libavcodec/mjpegdec.c')
| -rw-r--r-- | libavcodec/mjpegdec.c | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/libavcodec/mjpegdec.c b/libavcodec/mjpegdec.c index 6dfe832865..ebde12cf98 100644 --- a/libavcodec/mjpegdec.c +++ b/libavcodec/mjpegdec.c @@ -98,6 +98,15 @@ static void parse_avid(MJpegDecodeContext *s, uint8_t *buf, int len) av_log(s->avctx, AV_LOG_INFO, "AVID: len:%d %d\n", len, len > 14 ? buf[12] : -1); } +static void init_idct(AVCodecContext *avctx) +{ + MJpegDecodeContext *s = avctx->priv_data; + + ff_idctdsp_init(&s->idsp, avctx); + ff_init_scantable(s->idsp.idct_permutation, &s->scantable, + ff_zigzag_direct); +} + av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx) { MJpegDecodeContext *s = avctx->priv_data; @@ -112,9 +121,7 @@ av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx) s->avctx = avctx; ff_blockdsp_init(&s->bdsp, avctx); ff_hpeldsp_init(&s->hdsp, avctx->flags); - ff_idctdsp_init(&s->idsp, avctx); - ff_init_scantable(s->idsp.idct_permutation, &s->scantable, - ff_zigzag_direct); + init_idct(avctx); s->buffer_size = 0; s->buffer = NULL; s->start_code = -1; @@ -267,7 +274,6 @@ int ff_mjpeg_decode_sof(MJpegDecodeContext *s) /* XXX: verify len field validity */ len = get_bits(&s->gb, 16); - s->avctx->bits_per_raw_sample = bits = get_bits(&s->gb, 8); if (bits > 16 || bits < 1) { @@ -275,6 +281,11 @@ int ff_mjpeg_decode_sof(MJpegDecodeContext *s) return AVERROR_INVALIDDATA; } + if (s->avctx->bits_per_raw_sample != bits) { + av_log(s->avctx, AV_LOG_INFO, "Changeing bps to %d\n", bits); + s->avctx->bits_per_raw_sample = bits; + init_idct(s->avctx); + } if (s->pegasus_rct) bits = 9; if (bits == 9 && !s->pegasus_rct) |