[FFmpeg-devel] [PATCH] avcodec/cscd: Check output len in zlib as in lzo

[Michael Niedermayer]

Fixes: Timeout (>10sec -> 134ms)
Fixes: 27245/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_CSCD_fuzzer-575318210772992

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
 libavcodec/cscd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/cscd.c b/libavcodec/cscd.c
index d50ddd6258..f5c93e9912 100644
--- a/libavcodec/cscd.c
+++ b/libavcodec/cscd.c
@@ -93,7 +93,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
     case 1: { // zlib compression
 #if CONFIG_ZLIB
         unsigned long dlen = c->decomp_size;
-        if (uncompress(c->decomp_buf, &dlen, &buf[2], buf_size - 2) != Z_OK) {
+        if (uncompress(c->decomp_buf, &dlen, &buf[2], buf_size - 2) != Z_OK || dlen != c->decomp_size) {
             av_log(avctx, AV_LOG_ERROR, "error during zlib decompression\n");
             return AVERROR_INVALIDDATA;
         }
-- 
2.17.1