diff --git a/libavcodec/ffv1dec_template.c b/libavcodec/ffv1dec_template.c
index fecdbd0025c9733d8b5366b790d8cbe11c835d5d..25032feda0bdbad2cfcd4d578c6e96c5685f9601 100644
--- a/libavcodec/ffv1dec_template.c
+++ b/libavcodec/ffv1dec_template.c
@@ -50,6 +50,11 @@ static av_always_inline int RENAME(decode_line)(FFV1Context *s, int w,
     for (x = 0; x < w; x++) {
         int diff, context, sign;
 
+        if (!(x & 1023)) {
+            if (is_input_end(s))
+                return AVERROR_INVALIDDATA;
+        }
+
         context = RENAME(get_context)(p, sample[1] + x, sample[0] + x, sample[1] + x);
         if (context < 0) {
             context = -context;