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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.
This commit is contained in:
Stefano Sabatini 2011-03-30 21:30:31 +02:00
parent ffd39f9d23
commit 2f86e7bd12
1 changed files with 1 additions and 1 deletions
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2
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;