[FFmpeg-devel] [PATCH] avformat/matroskadec: Use rounded down duration in get_cue_desc() check

[FFmpeg-devel] [PATCH] avformat/matroskadec: Use rounded down duration in get_cue_desc() check

[Michael Niedermayer]

Floating point is evil, it would be better if duration was not a double

Fixes: Infinite loop
Fixes: 45123/clusterfuzz-testcase-minimized-ffmpeg_dem_WEBM_DASH_MANIFEST_fuzzer-6725052291219456

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavformat/matroskadec.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index 95e49cbe7f..4aa4f0d828 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -4008,7 +4008,8 @@ static CueDesc get_cue_desc(AVFormatContext *s, int64_t ts, int64_t cues_start)
     CueDesc cue_desc;
     int i;
 
-    if (ts >= matroska->duration * matroska->time_scale) return (CueDesc) {-1, -1, -1, -1};
+    if (ts >= (int64_t)(matroska->duration * matroska->time_scale))
+        return (CueDesc) {-1, -1, -1, -1};
     for (i = 1; i < nb_index_entries; i++) {
         if (index_entries[i - 1].timestamp * matroska->time_scale <= ts &&
             index_entries[i].timestamp * matroska->time_scale > ts) {
-- 
2.17.1

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Re: [FFmpeg-devel] [PATCH] avformat/matroskadec: Use rounded down duration in get_cue_desc() check

[Michael Niedermayer]

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On Fri, Mar 11, 2022 at 12:47:47AM +0100, Michael Niedermayer wrote:
> Floating point is evil, it would be better if duration was not a double
> 
> Fixes: Infinite loop
> Fixes: 45123/clusterfuzz-testcase-minimized-ffmpeg_dem_WEBM_DASH_MANIFEST_fuzzer-6725052291219456
> 
> Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
> ---
>  libavformat/matroskadec.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)

will apply

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