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avformat/scd: ensure SCD_MIN_HEADER_SIZE bytes are read

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Instead of accessing unintialized data when input is shorter than
expected size.

Fixes use of uninitialized value in MSAN build.
Found by OSS-Fuzz.

Signed-off-by: Kacper Michajłow <kasper93@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Kacper Michajłow
2025-07-07 21:25:30 +02:00
committed by Michael Niedermayer
parent 1787fade20
commit 3334bdc6e7
1 changed files with 2 additions and 1 deletions
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3
libavformat/scd.c
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@@ -30,6 +30,7 @@
#include "libavutil/mem.h"
#include "libavformat/internal.h"
#include "avformat.h"
#include "avio_internal.h"
#include "demux.h"
#define SCD_MAGIC ((uint64_t)MKBETAG('S', 'E', 'D', 'B') << 32 | \
@@ -243,7 +244,7 @@ static int scd_read_header(AVFormatContext *s)
SCDDemuxContext *ctx = s->priv_data;
uint8_t buf[SCD_MIN_HEADER_SIZE];
if ((ret = avio_read(s->pb, buf, SCD_MIN_HEADER_SIZE)) < 0)
if ((ret = ffio_read_size(s->pb, buf, SCD_MIN_HEADER_SIZE)) < 0)
return ret;
ctx->hdr.magic = AV_RB64(buf + 0);