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commit 32e4ddeda398ae7952338715fdb4f10066a19aea
Author:     Michael Niedermayer <[email protected]>
AuthorDate: Mon Feb 23 20:29:40 2026 +0100
Commit:     Michael Niedermayer <[email protected]>
CommitDate: Tue Mar 3 03:28:03 2026 +0100

    avformat/vividas: Reset n_audio_subpackets on error
    
    Fixes: signed integer overflow: -63 - 2147483594 cannot be represented in 
type 'int'
    Fixes: 
486530208/clusterfuzz-testcase-minimized-ffmpeg_dem_VIVIDAS_fuzzer-4694818252193792
    
    Found-by: continuous fuzzing process 
https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
    Signed-off-by: Michael Niedermayer <[email protected]>
---
 libavformat/vividas.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libavformat/vividas.c b/libavformat/vividas.c
index b708d71c65..76557acb8b 100644
--- a/libavformat/vividas.c
+++ b/libavformat/vividas.c
@@ -723,8 +723,10 @@ static int viv_read_packet(AVFormatContext *s,
         }
         last_start =
         viv->audio_subpackets[viv->n_audio_subpackets].start = (int)(off - 
avio_tell(pb));
-        if (last_start < last)
+        if (last_start < last) {
+            viv->n_audio_subpackets = 0;
             return AVERROR_INVALIDDATA;
+        }
         viv->current_audio_subpacket = 0;
 
     } else {

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