[FFmpeg-devel] [PATCH] fix for invalid creation time crash (roundup issue 2490)

[Daniel Kang]

I am a Google Code-In student, and as part of a task, I have used zzuf
to generate a mov file with an invalid creation time. This causes ffmpeg
to crash. gmtime is called, and when it cannot convert the time, it
returns NULL. Then, strftime is called with a NULL pointer and
segfaults. The roundup issue is 2490. I have attached a patch to fix
this. The patch adds a sanity check for NULL pointers. Are there any
comments?
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