diff --git a/libavformat/mov.c b/libavformat/mov.c
index 940393d3b3..be602ee652 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -537,7 +537,8 @@ static int mov_read_dref(MOVContext *c, AVIOContext *pb, MOVAtom atom)
                     dref->dir = av_malloc(len+1);
                     if (!dref->dir)
                         return AVERROR(ENOMEM);
-                    avio_read(pb, dref->dir, len);
+                    if (avio_read(pb, dref->dir, len) != len)
+                        return AVERROR_INVALIDDATA;
                     dref->dir[len] = 0;
                     for (j = 0; j < len; j++)
                         if (dref->dir[j] == ':')