From b43188de0cd27787a75c79856e72c649d4ee9035 Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Wed, 18 Jan 2012 12:56:02 +0300 Subject: nfsd: don't allow zero length strings in cache_parse() commit 6d8d17499810479eabd10731179c04b2ca22152f upstream. There is no point in passing a zero length string here and quite a few of that cache_parse() implementations will Oops if count is zero. Signed-off-by: Dan Carpenter Signed-off-by: J. Bruce Fields Signed-off-by: Greg Kroah-Hartman --- net/sunrpc/cache.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c index 72ad836e4fe0..4530a912b8b0 100644 --- a/net/sunrpc/cache.c +++ b/net/sunrpc/cache.c @@ -828,6 +828,8 @@ static ssize_t cache_do_downcall(char *kaddr, const char __user *buf, { ssize_t ret; + if (count == 0) + return -EINVAL; if (copy_from_user(kaddr, buf, count)) return -EFAULT; kaddr[count] = '\0'; -- cgit v1.2.3