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h264_mp4toannexb: Add a comment about possible overread 

Before reading a 16bit size field during parsing of extradata, no check
is performed to make sure that said length field is actually contained
in the extradata. Given that this overread is not dangerous (the extradata
is supposed to be padded), only a comment for it has been added; the error
itself will be detected as part of the normal check for overreads.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Andreas Rheinhardt 2019-12-14 23:19:17 +01:00 committed by Michael Niedermayer
parent 268dffc12b
commit 015950596c
1 changed files with 1 additions and 0 deletions
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libavcodec/h264_mp4toannexb_bsf.c
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@ -98,6 +98,7 @@ static int h264_extradata_to_annexb(AVBSFContext *ctx, const int padding)
while (unit_nb--) {
int err;
/* possible overread ok due to padding */
unit_size = bytestream2_get_be16u(gb);
total_size += unit_size + 4;
av_assert1(total_size <= INT_MAX - padding);