[FFmpeg-devel] [PR] avformat/vividas: Reset n_audio_subpackets on error (PR #22271)

[FFmpeg-devel] [PR] avformat/vividas: Reset n_audio_subpackets on error (PR #22271)

[michaelni via ffmpeg-devel]

PR #22271 opened by michaelni
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/22271
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/22271.patch

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 <michael@niedermayer.cc>


>From dbc8531b57a657340678ae289678377c54688af4 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Mon, 23 Feb 2026 20:29:40 +0100
Subject: [PATCH] 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 <michael@niedermayer.cc>
---
 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 {
-- 
2.52.0

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