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avfiltergraph: check for sws opts being non-NULL before using them.

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Avoid snprintfing a NULL pointer.

CC: libav-stable@libav.org
(cherry picked from commit 6e3c13a559)

Signed-off-by: Reinhard Tartler <siretart@tauware.de>
This commit is contained in:
Anton Khirnov
2013-03-17 16:14:58 +01:00
committed by Reinhard Tartler
parent f844cb9bce
commit 33c9e18b09
2 changed files with 8 additions and 2 deletions
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3
libavfilter/graphparser.c
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@@ -121,7 +121,8 @@ static int create_filter(AVFilterContext **filt_ctx, AVFilterGraph *ctx, int ind
return ret;
}
if (!strcmp(filt_name, "scale") && args && !strstr(args, "flags")) {
if (!strcmp(filt_name, "scale") && args && !strstr(args, "flags") &&
ctx->scale_sws_opts) {
snprintf(tmp_args, sizeof(tmp_args), "%s:%s",
args, ctx->scale_sws_opts);
args = tmp_args;