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graphparser: add a NULL check on the argument passed to strstr

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Fix crash in create_filter() which occurrs if a scale filter with no
args is provided.

Signed-off-by: Anton Khirnov <anton@khirnov.net>
This commit is contained in:
Stefano Sabatini 2011-03-30 21:30:31 +02:00 committed by Anton Khirnov
parent c61bfc113a
commit f80b381bfd
1 changed files with 1 additions and 1 deletions
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libavfilter/graphparser.c
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@ -121,7 +121,7 @@ static int create_filter(AVFilterContext **filt_ctx, AVFilterGraph *ctx, int ind
return ret;
}
if (!strcmp(filt_name, "scale") && !strstr(args, "flags")) {
if (!strcmp(filt_name, "scale") && args && !strstr(args, "flags")) {
snprintf(tmp_args, sizeof(tmp_args), "%s:%s",
args, ctx->scale_sws_opts);
args = tmp_args;