diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index 0e150f9138..efa3e44c85 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -4618,9 +4618,10 @@ static int64_t webm_dash_manifest_compute_bandwidth(AVFormatContext *s, int64_t
             // The prebuffer ends in the last Cue. Estimate how much data was
             // prebuffered.
             pre_bytes = desc_end.end_offset - desc_end.start_offset;
-            pre_ns = desc_end.end_time_ns - desc_end.start_time_ns;
-            if (pre_ns <= 0)
+            if (desc_end.end_time_ns <= desc_end.start_time_ns ||
+                desc_end.end_time_ns - (uint64_t)desc_end.start_time_ns > INT64_MAX)
                 return -1;
+            pre_ns = desc_end.end_time_ns - desc_end.start_time_ns;
             pre_sec = pre_ns / nano_seconds_per_second;
             prebuffer_bytes +=
                 pre_bytes * ((temp_prebuffer_ns / nano_seconds_per_second) / pre_sec);