diff --git a/libavcodec/qdm2.c b/libavcodec/qdm2.c
index 1d0fb3774e..38eca42476 100644
--- a/libavcodec/qdm2.c
+++ b/libavcodec/qdm2.c
@@ -795,6 +795,11 @@ static int synthfilt_build_sb_samples (QDM2Context *q, GetBitContext *gb, int le
                 for (j = 0; j < 16; j++)
                     sign_bits[j] = get_bits1 (gb);
 
+            if (q->coding_method[0][sb][0] <= 0) {
+                av_log(NULL, AV_LOG_ERROR, "coding method invalid\n");
+                return AVERROR_INVALIDDATA;
+            }
+
             for (j = 0; j < 64; j++)
                 if (q->coding_method[1][sb][j] > q->coding_method[0][sb][j])
                     q->coding_method[0][sb][j] = q->coding_method[1][sb][j];