[FFmpeg-devel] [PATCH 3/4] avformat/ipmovie: Check signature_buffer read
Michael Niedermayer
michael at niedermayer.cc
Thu Dec 26 05:01:49 EET 2024
Fixes: use of uninitilaized data
Fixes: 385167047/clusterfuzz-testcase-minimized-ffmpeg_dem_IPMOVIE_fuzzer-5941477505564672
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
libavformat/ipmovie.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/libavformat/ipmovie.c b/libavformat/ipmovie.c
index 5d1748953ab..3701be276f3 100644
--- a/libavformat/ipmovie.c
+++ b/libavformat/ipmovie.c
@@ -614,7 +614,8 @@ static int ipmovie_read_header(AVFormatContext *s)
ipmovie->avf = s;
- avio_read(pb, signature_buffer, sizeof(signature_buffer));
+ if (avio_read(pb, signature_buffer, sizeof(signature_buffer)) != sizeof(signature_buffer))
+ return AVERROR_INVALIDDATA;
while (memcmp(signature_buffer, signature, sizeof(signature))) {
memmove(signature_buffer, signature_buffer + 1, sizeof(signature_buffer) - 1);
signature_buffer[sizeof(signature_buffer) - 1] = avio_r8(pb);
--
2.47.0
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