The variable "err" is not initialized, and set only when something went wrong.
When everything is OK, nobody sets it, so using it result in UB.
---
libavformat/vapoursynth.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavformat/vapoursynth.c b/libavformat/vapoursynth.c
index f3ad6910e5..69fde1a806 100644
--- a/libavformat/vapoursynth.c
+++ b/libavformat/vapoursynth.c
@@ -177,7 +177,7 @@ static av_cold int read_header_vs(AVFormatContext *s)
char dummy;
const VSVideoInfo *info;
struct VSState *vss_state;
- int err;
+ int err = 0;
vss_state = av_mallocz(sizeof(*vss_state));
if (!vss_state) {
--
2.20.1
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