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avformat/assenc: Fix potential NULL + 1 

Incrementing a NULL pointer is undefined behaviour,
yet this is what would happen in case trailer were NULL
before the check.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2023-03-14 04:03:19 +01:00
parent 8e53233f68
commit 43991dbd05
1 changed files with 2 additions and 2 deletions
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4
libavformat/assenc.c
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@ -63,8 +63,8 @@ static int write_header(AVFormatContext *s)
if (trailer) if (trailer)
trailer = strstr(trailer, "\n"); trailer = strstr(trailer, "\n");
if (trailer++) { if (trailer) {
header_size = (trailer - par->extradata); header_size = (++trailer - par->extradata);
ass->trailer_size = par->extradata_size - header_size; ass->trailer_size = par->extradata_size - header_size;
if (ass->trailer_size) if (ass->trailer_size)
ass->trailer = trailer; ass->trailer = trailer;