diff --git a/libavcodec/dpx.c b/libavcodec/dpx.c
index e4dd1b05b5..ffebbd8fd6 100644
--- a/libavcodec/dpx.c
+++ b/libavcodec/dpx.c
@@ -147,6 +147,9 @@ static int decode_frame(AVCodecContext *avctx,
         return AVERROR_PATCHWELCOME;
     }
 
+    if (bits_per_color > 32)
+        return AVERROR_INVALIDDATA;
+
     buf += 820;
     avctx->sample_aspect_ratio.num = read32(&buf, endian);
     avctx->sample_aspect_ratio.den = read32(&buf, endian);