diff --git a/libavcodec/alsdec.c b/libavcodec/alsdec.c
index bfadf70e0d..b1f6b3a435 100644
--- a/libavcodec/alsdec.c
+++ b/libavcodec/alsdec.c
@@ -1468,6 +1468,11 @@ static int read_frame_data(ALSDecContext *ctx, unsigned int ra_frame)
 
     // TODO: read_diff_float_data
 
+    if (get_bits_left(gb) < 0) {
+        av_log(ctx->avctx, AV_LOG_ERROR, "Overread %d\n", -get_bits_left(gb));
+        return AVERROR_INVALIDDATA;
+    }
+
     return 0;
 }