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| author | Michael Niedermayer <michaelni@gmx.at> | 2012-02-17 13:35:10 -0800 |
|---|---|---|
| committer | Reinhard Tartler <siretart@tauware.de> | 2012-04-01 18:33:28 +0200 |
| commit | 4be63587e110c05cda3101abf2e3745d919f3fae (patch) | |
| tree | 6f469555bee1527b6252cdfbe0c33800574b4e2e | |
| parent | a642953b0f1c87592d2e7bff5b67ed024bc29a64 (diff) | |
| download | ffmpeg-4be63587e110c05cda3101abf2e3745d919f3fae.tar.gz | |
h263dec: Disallow width/height changing with frame threads.
Fixes CVE-2011-3937
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 71db86d53b5c6872cea31bf714a1a38ec78feaba)
Conflicts:
libavcodec/h263dec.c
Signed-off-by: Alex Converse <alex.converse@gmail.com>
Signed-off-by: Reinhard Tartler <siretart@tauware.de>
| -rw-r--r-- | libavcodec/h263dec.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/libavcodec/h263dec.c b/libavcodec/h263dec.c index bc6d613be4..abdaf2bf24 100644 --- a/libavcodec/h263dec.c +++ b/libavcodec/h263dec.c @@ -552,8 +552,7 @@ retry: #if HAVE_MMX if (s->codec_id == CODEC_ID_MPEG4 && s->xvid_build>=0 && avctx->idct_algo == FF_IDCT_AUTO && (av_get_cpu_flags() & AV_CPU_FLAG_MMX)) { avctx->idct_algo= FF_IDCT_XVIDMMX; - avctx->coded_width= 0; // force reinit -// dsputil_init(&s->dsp, avctx); + ff_dct_common_init(s); s->picture_number=0; } #endif @@ -567,6 +566,12 @@ retry: || s->height != avctx->coded_height) { /* H.263 could change picture size any time */ ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat + + if (HAVE_THREADS && (s->avctx->active_thread_type&FF_THREAD_FRAME)) { + av_log_missing_feature(s->avctx, "Width/height/bit depth/chroma idc changing with threads is", 0); + return -1; // width / height changed during parallelized decoding + } + s->parse_context.buffer=0; MPV_common_end(s); s->parse_context= pc; |