diff --git a/libavcodec/iff.c b/libavcodec/iff.c
index 76ad63d102..83d0ee524d 100644
--- a/libavcodec/iff.c
+++ b/libavcodec/iff.c
@@ -722,6 +722,8 @@ static void decode_deep_rle32(uint8_t *dst, const uint8_t *src, int src_size, in
             int size = opcode + 1;
             for (i = 0; i < size; i++) {
                 int length = FFMIN(size - i, width);
+                if (src_end - src < length * 4)
+                    return;
                 memcpy(dst + y*linesize + x * 4, src, length * 4);
                 src += length * 4;
                 x += length;