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opt: avoid segfault in av_opt_next() if the class does not have an option list

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CC: libav-stable@libav.org
(cherry picked from commit d02202e08a994c6c80f0256ae756698541b59902)

Signed-off-by: Reinhard Tartler <siretart@tauware.de>
This commit is contained in:
Justin Ruggles 2012-11-08 18:35:49 -05:00 committed by Reinhard Tartler
parent 77e6676d3e
commit dfb7a638e6
1 changed files with 4 additions and 2 deletions
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6
libavutil/opt.c
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@ -57,8 +57,10 @@ const AVOption *av_next_option(void *obj, const AVOption *last)
const AVOption *av_opt_next(void *obj, const AVOption *last)
{
AVClass *class = *(AVClass**)obj;
if (!last && class->option[0].name) return class->option;
if (last && last[1].name) return ++last;
if (!last && class->option && class->option[0].name)
return class->option;
if (last && last[1].name)
return ++last;
return NULL;
}