[FFmpeg-devel] [PATCH 5/6] avformat/iff: Check that we have a stream in read_dst_frame()

From: Michael Niedermayer <michael@niedermayer.cc>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: [FFmpeg-devel] [PATCH 5/6] avformat/iff: Check that we have a stream in read_dst_frame()
Date: Sun,  9 Feb 2025 03:24:20 +0100
Message-ID: <20250209022421.2346210-5-michael@niedermayer.cc> (raw)
In-Reply-To: <20250209022421.2346210-1-michael@niedermayer.cc>

Fixes: null pointer dereference
Fixes: 385644864/clusterfuzz-testcase-minimized-ffmpeg_dem_IFF_fuzzer-4551049565765632

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

diff --git a/libavformat/iff.c b/libavformat/iff.c
index 38f90dd81cb..7142a06e98f 100644
--- a/libavformat/iff.c
+++ b/libavformat/iff.c
@@ -364,6 +364,9 @@ static int read_dst_frame(AVFormatContext *s, AVPacket *pkt)
     uint64_t chunk_pos, data_pos, data_size;
     int ret = AVERROR_EOF;
 
+    if (s->nb_streams < 1)
+        return AVERROR_INVALIDDATA;
+
     while (!avio_feof(pb)) {
         chunk_pos = avio_tell(pb);
         if (chunk_pos >= iff->body_end)
-- 
2.48.1

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