[FFmpeg-cvslog] avformat/iamf_reader: Initialize padding and check read in ff_iamf_read_packet()

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Thu Dec 26 03:28:53 2024 +0100| [aec2933344b2b32fc931bdf0b46eef1bd42225ff] | committer: Michael Niedermayer

avformat/iamf_reader: Initialize padding and check read in ff_iamf_read_packet()

Fixes: Use of uninitialized memory
Fixes: 377642312/clusterfuzz-testcase-minimized-ffmpeg_dem_IAMF_fuzzer-4554550985424896

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=aec2933344b2b32fc931bdf0b46eef1bd42225ff
---

 libavformat/iamf_reader.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libavformat/iamf_reader.c b/libavformat/iamf_reader.c
index 9f3469b64f..d331e1315e 100644
--- a/libavformat/iamf_reader.c
+++ b/libavformat/iamf_reader.c
@@ -282,7 +282,7 @@ int ff_iamf_read_packet(AVFormatContext *s, IAMFDemuxContext *c,
     int read = 0;
 
     while (1) {
-        uint8_t header[MAX_IAMF_OBU_HEADER_SIZE + AV_INPUT_BUFFER_PADDING_SIZE];
+        uint8_t header[MAX_IAMF_OBU_HEADER_SIZE + AV_INPUT_BUFFER_PADDING_SIZE] = {0};
         enum IAMF_OBU_Type type;
         unsigned obu_size;
         unsigned skip_samples, discard_padding;
@@ -294,6 +294,8 @@ int ff_iamf_read_packet(AVFormatContext *s, IAMFDemuxContext *c,
         size = avio_read(pb, header, FFMIN(MAX_IAMF_OBU_HEADER_SIZE, max_size));
         if (size < 0)
             return size;
+        if (size != FFMIN(MAX_IAMF_OBU_HEADER_SIZE, max_size))
+            return AVERROR_INVALIDDATA;
 
         len = ff_iamf_parse_obu_header(header, size, &obu_size, &start_pos, &type,
                                        &skip_samples, &discard_padding);