[FFmpeg-cvslog] avformat/lafdec: Check for EOF in header reading

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sat Nov 12 18:14:19 2022 +0100| [b92260f70a4ac194d1cc09c40b92766d38c7c783] | committer: Michael Niedermayer

avformat/lafdec: Check for EOF in header reading

Fixes: OOM testcase
Fixes: 51527/clusterfuzz-testcase-minimized-ffmpeg_dem_LAF_fuzzer-5453663505612800

OOM can still happen after this as an arbitrary sized block is allocated and read
this would require a redesign or some limit on the sample rate.

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=b92260f70a4ac194d1cc09c40b92766d38c7c783
---

 libavformat/lafdec.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavformat/lafdec.c b/libavformat/lafdec.c
index 12b0d8540b..d02b479c4d 100644
--- a/libavformat/lafdec.c
+++ b/libavformat/lafdec.c
@@ -111,6 +111,9 @@ static int laf_read_header(AVFormatContext *ctx)
     sample_rate = avio_rl32(pb);
     duration = avio_rl64(pb) / st_count;
 
+    if (avio_feof(pb))
+        return AVERROR_INVALIDDATA;
+
     switch (quality) {
     case 0:
         codec_id = AV_CODEC_ID_PCM_U8;