Fixes: out of array read Fixes: 69673/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SNOW_fuzzer-5476592894148608
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> --- libavcodec/snowenc.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/libavcodec/snowenc.c b/libavcodec/snowenc.c index 8d6dabae658..dd6ce36aa54 100644 --- a/libavcodec/snowenc.c +++ b/libavcodec/snowenc.c @@ -413,6 +413,7 @@ static int encode_q_branch(SnowEncContext *enc, int level, int x, int y) int my_context= av_log2(2*FFABS(left->my - top->my)); int s_context= 2*left->level + 2*top->level + tl->level + tr->level; int ref, best_ref, ref_score, ref_mx, ref_my; + int range = MAX_MV >> (1 + qpel); av_assert0(sizeof(s->block_state) >= 256); if(s->keyframe){ @@ -454,6 +455,11 @@ static int encode_q_branch(SnowEncContext *enc, int level, int x, int y) c->xmax = - (x+1)*block_w + (w<<(LOG2_MB_SIZE - s->block_max_depth)) + 16-3; c->ymax = - (y+1)*block_w + (h<<(LOG2_MB_SIZE - s->block_max_depth)) + 16-3; + c->xmin = FFMAX(c->xmin,-range); + c->xmax = FFMIN(c->xmax, range); + c->ymin = FFMAX(c->ymin,-range); + c->ymax = FFMIN(c->ymax, range); + if(P_LEFT[0] > (c->xmax<<shift)) P_LEFT[0] = (c->xmax<<shift); if(P_LEFT[1] > (c->ymax<<shift)) P_LEFT[1] = (c->ymax<<shift); if(P_TOP[0] > (c->xmax<<shift)) P_TOP[0] = (c->xmax<<shift); -- 2.45.2 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
