[FFmpeg-devel] [PR] avformat/scd: Use ffio_read_size() (PR #21679)

[michaelni via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>]

PR #21679 opened by michaelni
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21679
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21679.patch

Fixes: use of uninitialized memory
Fixes: 471771529/clusterfuzz-testcase-minimized-ffmpeg_dem_SCD_fuzzer-5328203515494400

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


>From a5007428e853c5a61e4ac3c6e24fa0304c3d0c1e Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Sun, 8 Feb 2026 00:19:12 +0100
Subject: [PATCH] avformat/scd: Use ffio_read_size()

Fixes: use of uninitialized memory
Fixes: 471771529/clusterfuzz-testcase-minimized-ffmpeg_dem_SCD_fuzzer-5328203515494400

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavformat/scd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/scd.c b/libavformat/scd.c
index 06d3408e15..091d20824c 100644
--- a/libavformat/scd.c
+++ b/libavformat/scd.c
@@ -122,7 +122,7 @@ static int scd_read_offsets(AVFormatContext *s)
     SCDDemuxContext  *ctx = s->priv_data;
     uint8_t buf[SCD_OFFSET_HEADER_SIZE];
 
-    if ((ret = avio_read(s->pb, buf, SCD_OFFSET_HEADER_SIZE)) < 0)
+    if ((ret = ffio_read_size(s->pb, buf, SCD_OFFSET_HEADER_SIZE)) < 0)
         return ret;
 
     ctx->hdr.table0.count  = AV_RB16(buf +  0);
-- 
2.52.0

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