1 files changed, 1 insertions, 1 deletions

diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index 62f3b9074e84..5f312abf1247 100644
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -87,7 +87,7 @@ static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
         struct svc_expkey key;
         struct svc_expkey *ek = NULL;
 
-        if (mesg[mlen-1] != '\n')
+        if (mlen < 1 || mesg[mlen-1] != '\n')
                 return -EINVAL;
         mesg[mlen-1] = 0;