[FFmpeg-devel] [PATCH 1/7] avformat/vivo: Do not use the general expression evaluator for parsing a floating point value

[Michael Niedermayer]

Fixes: Timeout
Fixes: 41564/clusterfuzz-testcase-minimized-ffmpeg_dem_VIVO_fuzzer-6309014024093696

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
 libavformat/vivo.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/libavformat/vivo.c b/libavformat/vivo.c
index b2904cd25a7..8e819d910b7 100644
--- a/libavformat/vivo.c
+++ b/libavformat/vivo.c
@@ -206,11 +206,12 @@ static int vivo_read_header(AVFormatContext *s)
                     return AVERROR_INVALIDDATA;
                 value_used = 1;
             } else if (!strcmp(key, "FPS")) {
-                AVRational tmp;
+                double d;
+                if (sscanf(value, "%f", &d) != 1)
+                    return AVERROR_INVALIDDATA;
 
                 value_used = 1;
-                if (!av_parse_ratio(&tmp, value, 10000, AV_LOG_WARNING, s))
-                    fps = av_inv_q(tmp);
+                fps = av_d2q(1/d, 10000);
             }
 
             if (!value_used)
-- 
2.17.1