ffmpeg | branch: release/2.8 | Michael Niedermayer <mich...@niedermayer.cc> | Fri Nov 27 22:45:46 2015 +0100| [e3487695442914c1f220b931e466af4e08ad7529] | committer: Michael Niedermayer
avcodec/hevc_cabac: Fix multiple integer overflows Fixes: 04ec80eefa77aecd7a49a442cc02baea/asan_heap-oob_19544fa_3303_1905796cd9d8e15f86d664332caabc00.bit Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> (cherry picked from commit d5028f61e44b7607b6a547f218f7d85217490a5b) Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=e3487695442914c1f220b931e466af4e08ad7529 --- libavcodec/hevc_cabac.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/libavcodec/hevc_cabac.c b/libavcodec/hevc_cabac.c index ffff87d..d1bef83 100644 --- a/libavcodec/hevc_cabac.c +++ b/libavcodec/hevc_cabac.c @@ -831,11 +831,13 @@ static av_always_inline int mvd_decode(HEVCContext *s) int k = 1; while (k < CABAC_MAX_BIN && get_cabac_bypass(&s->HEVClc->cc)) { - ret += 1 << k; + ret += 1U << k; k++; } - if (k == CABAC_MAX_BIN) + if (k == CABAC_MAX_BIN) { av_log(s->avctx, AV_LOG_ERROR, "CABAC_MAX_BIN : %d\n", k); + return 0; + } while (k--) ret += get_cabac_bypass(&s->HEVClc->cc) << k; return get_cabac_bypass_sign(&s->HEVClc->cc, -ret); @@ -973,8 +975,10 @@ static av_always_inline int coeff_abs_level_remaining_decode(HEVCContext *s, int while (prefix < CABAC_MAX_BIN && get_cabac_bypass(&s->HEVClc->cc)) prefix++; - if (prefix == CABAC_MAX_BIN) + if (prefix == CABAC_MAX_BIN) { av_log(s->avctx, AV_LOG_ERROR, "CABAC_MAX_BIN : %d\n", prefix); + return 0; + } if (prefix < 3) { for (i = 0; i < rc_rice_param; i++) suffix = (suffix << 1) | get_cabac_bypass(&s->HEVClc->cc); _______________________________________________ ffmpeg-cvslog mailing list ffmpeg-cvslog@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-cvslog
