ffmpeg | branch: master | Michael Niedermayer <mich...@niedermayer.cc> | Sun May 28 17:20:42 2017 +0200| [67b30decf7793523f7fdaef6fdf7f1179ef42b18] | committer: Michael Niedermayer
avcodec/ylc: Check count in build_vlc() Fixes: runtime error: signed integer overflow: 211633430 + 2147483647 cannot be represented in type 'int' Fixes: 1874/clusterfuzz-testcase-minimized-5037763613163520 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=67b30decf7793523f7fdaef6fdf7f1179ef42b18 --- libavcodec/ylc.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/libavcodec/ylc.c b/libavcodec/ylc.c index 02162a37e7..bf55e37be1 100644 --- a/libavcodec/ylc.c +++ b/libavcodec/ylc.c @@ -109,7 +109,7 @@ static int build_vlc(AVCodecContext *avctx, VLC *vlc, const uint32_t *table) int new_node = j; int first_node = cur_node; int second_node = cur_node; - int nd, st; + unsigned nd, st; nodes[cur_node].count = -1; @@ -133,6 +133,10 @@ static int build_vlc(AVCodecContext *avctx, VLC *vlc, const uint32_t *table) st = nodes[first_node].count; nodes[second_node].count = 0; nodes[first_node].count = 0; + if (nd >= UINT32_MAX - st) { + av_log(avctx, AV_LOG_ERROR, "count overflow\n"); + return AVERROR_INVALIDDATA; + } nodes[cur_node].count = nd + st; nodes[cur_node].sym = -1; nodes[cur_node].n0 = cur_node; _______________________________________________ ffmpeg-cvslog mailing list ffmpeg-cvslog@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-cvslog
