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avfilter/avfilter: fix null pointer dereference with queued ping filters

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-09-10 13:39:57 +02:00
parent 9b07d34efb
commit bb23bf8fd7
1 changed files with 8 additions and 0 deletions
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8
libavfilter/avfilter.c
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@ -427,7 +427,15 @@ void ff_update_link_current_pts(AVFilterLink *link, int64_t pts)
int avfilter_process_command(AVFilterContext *filter, const char *cmd, const char *arg, char *res, int res_len, int flags)
{
if(!strcmp(cmd, "ping")){
char local_res[256] = {0};
if (!res) {
res = local_res;
res_len = sizeof(local_res);
}
av_strlcatf(res, res_len, "pong from:%s %s\n", filter->filter->name, filter->name);
if (res == local_res)
av_log(filter, AV_LOG_INFO, "%s", res);
return 0;
}else if(!strcmp(cmd, "enable")) {
return set_enable_expr(filter, arg);