[FFmpeg-cvslog] avformat/vqf: Ensure that comm_chunk is fully read

[Michael Niedermayer]

ffmpeg | branch: release/6.1 | Michael Niedermayer <michael at niedermayer.cc> | Wed Jul 23 13:36:42 2025 +0200| [1865bc93fc8975cef557b08b5a958b8cc4a173a7] | committer: Michael Niedermayer

avformat/vqf: Ensure that comm_chunk is fully read

Fixes: use of uninitialized memory
Fixes: 412125811/clusterfuzz-testcase-minimized-ffmpeg_dem_VQF_fuzzer-6253774274887680

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 1b7a327b3a43df6ab82885cea5ae02bf9dd899a9)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=1865bc93fc8975cef557b08b5a958b8cc4a173a7
---

 libavformat/vqf.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/libavformat/vqf.c b/libavformat/vqf.c
index db49fdcfd9..e282011845 100644
--- a/libavformat/vqf.c
+++ b/libavformat/vqf.c
@@ -20,6 +20,7 @@
  */
 
 #include "avformat.h"
+#include "avio_internal.h"
 #include "internal.h"
 #include "libavutil/intreadwrite.h"
 #include "libavutil/dict.h"
@@ -141,7 +142,9 @@ static int vqf_read_header(AVFormatContext *s)
             if (len < 12)
                 return AVERROR_INVALIDDATA;
 
-            avio_read(s->pb, comm_chunk, 12);
+            ret = ffio_read_size(s->pb, comm_chunk, 12);
+            if (ret < 0)
+                return ret;
             st->codecpar->ch_layout.nb_channels = AV_RB32(comm_chunk) + 1;
             read_bitrate        = AV_RB32(comm_chunk + 4);
             rate_flag           = AV_RB32(comm_chunk + 8);