[FFmpeg-cvslog] tools/target_dec_fuzzer: adjust pixel threshold for MSRLE, as it allows coding gigantic images on tiny input

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Mon Aug 12 21:17:02 2019 +0200| [df7e79a5c31efa5bd8ced01d7145ca6fc1dc1bc3] | committer: Michael Niedermayer

tools/target_dec_fuzzer: adjust pixel threshold for MSRLE, as it allows coding gigantic images on tiny input

Fixes: Timeout (12sec ->2sec)
Fixes: 16125/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MSRLE_fuzzer-5650846364205056

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda at gmail.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=df7e79a5c31efa5bd8ced01d7145ca6fc1dc1bc3
---

 tools/target_dec_fuzzer.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/target_dec_fuzzer.c b/tools/target_dec_fuzzer.c
index e6eed88781..d83039417c 100644
--- a/tools/target_dec_fuzzer.c
+++ b/tools/target_dec_fuzzer.c
@@ -170,6 +170,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
     maxpixels = maxpixels_per_frame * maxiteration;
     switch (c->id) {
         // Allows a small input to generate gigantic output
+    case AV_CODEC_ID_MSRLE:     maxpixels /= 16;  break;
     case AV_CODEC_ID_QTRLE:     maxpixels /= 16;  break;
     case AV_CODEC_ID_GIF:       maxpixels /= 16;  break;
         // Performs slow frame rescaling in C