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.rheinha...@outlook.com>
---
libavformat/assenc.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/libavformat/assenc.c b/libavformat/assenc.c
index 85a1e53371..a75f458023 100644
--- a/libavformat/assenc.c
+++ b/libavformat/assenc.c
@@ -63,8 +63,8 @@ static int write_header(AVFormatContext *s)
if (trailer)
trailer = strstr(trailer, "\n");
- if (trailer++) {
- header_size = (trailer - par->extradata);
+ if (trailer) {
+ header_size = (++trailer - par->extradata);
ass->trailer_size = par->extradata_size - header_size;
if (ass->trailer_size)
ass->trailer = trailer;
--
2.34.1
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