[FFmpeg-devel] [PATCH 2/3] avformat/avidec: Ignore duplicate GAB2

From: Michael Niedermayer <michael@niedermayer.cc>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: [FFmpeg-devel] [PATCH 2/3] avformat/avidec: Ignore duplicate GAB2
Date: Sat, 10 May 2025 16:36:07 +0200
Message-ID: <20250510143608.2309616-2-michael@niedermayer.cc> (raw)
In-Reply-To: <20250510143608.2309616-1-michael@niedermayer.cc>

Fixes: memleak
Fixes: 398401912/clusterfuzz-testcase-minimized-ffmpeg_dem_AVI_fuzzer-4669849976766464

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

diff --git a/libavformat/avidec.c b/libavformat/avidec.c
index 1ae09efc150..81a0ae31bab 100644
--- a/libavformat/avidec.c
+++ b/libavformat/avidec.c
@@ -1122,6 +1122,10 @@ static int read_gab2_sub(AVFormatContext *s, AVStream *st, AVPacket *pkt)
         int size;
         AVProbeData pd;
         unsigned int desc_len;
+
+        if (ast->sub_ctx)
+            return 0;
+
         AVIOContext *pb = avio_alloc_context(pkt->data + 7,
                                              pkt->size - 7,
                                              0, NULL, NULL, NULL, NULL);
-- 
2.49.0

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