[FFmpeg-cvslog] avcodec/cscd: Error out when LZ* decompression fails

[Michael Niedermayer]

ffmpeg | branch: release/3.3 | Michael Niedermayer <michael at niedermayer.cc> | Mon Mar 12 00:05:04 2018 +0100| [1d3c141af4f0fa693cf86d0d7a70265beace4cb5] | committer: Michael Niedermayer

avcodec/cscd: Error out when LZ* decompression fails

Fixes: Timeout
Fixes: 6304/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_CSCD_fuzzer-5754772461191168

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit d52be5d4e91871a22dac70af3e0ab429e95a2d10)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=1d3c141af4f0fa693cf86d0d7a70265beace4cb5
---

 libavcodec/cscd.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/libavcodec/cscd.c b/libavcodec/cscd.c
index 9e1dec9d96..35c4ee08c3 100644
--- a/libavcodec/cscd.c
+++ b/libavcodec/cscd.c
@@ -81,15 +81,19 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
     switch ((buf[0] >> 1) & 7) {
         case 0: { // lzo compression
             int outlen = c->decomp_size, inlen = buf_size - 2;
-            if (av_lzo1x_decode(c->decomp_buf, &outlen, &buf[2], &inlen))
+            if (av_lzo1x_decode(c->decomp_buf, &outlen, &buf[2], &inlen)) {
                 av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
+                return AVERROR_INVALIDDATA;
+            }
             break;
         }
         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) {
                 av_log(avctx, AV_LOG_ERROR, "error during zlib decompression\n");
+                return AVERROR_INVALIDDATA;
+            }
             break;
 #else
             av_log(avctx, AV_LOG_ERROR, "compiled without zlib support\n");