avfilter/vf_format: check that the format list is not empty
Fixes Ticket3210 Signed-off-by: Michael Niedermayer <michaelni@gmx.at> (cherry picked from commit ee16e0cacc16ea60c35a66796410012755263c3c)
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@ -55,6 +55,9 @@ static av_cold int init(AVFilterContext *ctx)
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int pix_fmt_name_len, ret;
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enum AVPixelFormat pix_fmt;
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if (!s->pix_fmts)
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return AVERROR(EINVAL);
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/* parse the list of formats */
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for (cur = s->pix_fmts; cur; cur = sep ? sep + 1 : NULL) {
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if (!(sep = strchr(cur, '|')))
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