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avformat/dhav: Check amount read

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Prevents potential use of uninitialized data in the following
memcmp().

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2024-05-22 06:57:19 +02:00
parent cf6d07522a
commit d8cad01805
1 changed files with 3 additions and 1 deletions
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4
libavformat/dhav.c
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@ -278,7 +278,9 @@ static int dhav_read_header(AVFormatContext *s)
if (ret < 0)
return ret;
avio_read(s->pb, signature, sizeof(signature));
ret = ffio_read_size(s->pb, signature, sizeof(signature));
if (ret < 0)
return ret;
if (!memcmp(signature, "DAHUA", 5)) {
avio_skip(s->pb, 0x400 - 5);
dhav->last_good_pos = avio_tell(s->pb);