diff --git a/libavformat/flvdec.c b/libavformat/flvdec.c
index 76d41b0c9b..d2d9b5bd43 100644
--- a/libavformat/flvdec.c
+++ b/libavformat/flvdec.c
@@ -428,9 +428,13 @@ static int parse_keyframes_index(AVFormatContext *s, AVIOContext *ioc, int64_t m
         }
 
         for (i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) {
+            double d;
             if (avio_r8(ioc) != AMF_DATA_TYPE_NUMBER)
                 goto invalid;
-            current_array[0][i] = av_int2double(avio_rb64(ioc));
+            d = av_int2double(avio_rb64(ioc));
+            if (isnan(d) || d < INT64_MIN || d > INT64_MAX)
+                goto invalid;
+            current_array[0][i] = d;
         }
         if (times && filepositions) {
             // All done, exiting at a position allowing amf_parse_object