avfilter/avfiltergraph: Add assert to write down in machine readable form what is assumed about sample rates in swap_samplerates_on_filter()

Fixes CID1397292

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

1 files changed, 2 insertions, 0 deletions

diff --git a/libavfilter/avfiltergraph.c b/libavfilter/avfiltergraph.c
index 97f242ebec..534c6701a8 100644
--- a/libavfilter/avfiltergraph.c
+++ b/libavfilter/avfiltergraph.c
@@ -876,6 +876,8 @@ static void swap_samplerates_on_filter(AVFilterContext *filter)
         for (j = 0; j < outlink->in_samplerates->nb_formats; j++) {
             int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
 
+            av_assert0(diff < INT_MAX); // This would lead to the use of uninitialized best_diff but is only possible with invalid sample rates
+
             if (diff < best_diff) {
                 best_diff = diff;
                 best_idx  = j;