[FFmpeg-cvslog] lavfi/vf_vpp_qsv: check output format string against NULL pointer

[Haihao Xiang]

ffmpeg | branch: master | Haihao Xiang <haihao.xiang at intel.com> | Mon Jan  9 15:12:08 2023 +0800| [6ce23ebaac4f36d0477da18991ef16188e52a2ad] | committer: Haihao Xiang

lavfi/vf_vpp_qsv: check output format string against NULL pointer

This is in preparation for reusing the code for other QSV filters. E.g.
deinterlacing_qsv may have an option array without format option

Signed-off-by: Haihao Xiang <haihao.xiang at intel.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=6ce23ebaac4f36d0477da18991ef16188e52a2ad
---

 libavfilter/vf_vpp_qsv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavfilter/vf_vpp_qsv.c b/libavfilter/vf_vpp_qsv.c
index b04307b644..4aad856a2e 100644
--- a/libavfilter/vf_vpp_qsv.c
+++ b/libavfilter/vf_vpp_qsv.c
@@ -279,7 +279,7 @@ static av_cold int vpp_init(AVFilterContext *ctx)
 {
     VPPContext  *vpp  = ctx->priv;
 
-    if (!strcmp(vpp->output_format_str, "same")) {
+    if (!vpp->output_format_str || !strcmp(vpp->output_format_str, "same")) {
         vpp->out_format = AV_PIX_FMT_NONE;
     } else {
         vpp->out_format = av_get_pix_fmt(vpp->output_format_str);