linux-kernel - [patch] nfsd: don't allow zero length strings in cache

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Date:	Wed, 18 Jan 2012 12:56:02 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	"J. Bruce Fields" <bfields@...ldses.org>
Cc:	Sasha Levin <levinsasha928@...il.com>,
	linux-kernel@...r.kernel.org, Neil Brown <neilb@...e.de>,
	linux-nfs@...r.kernel.org
Subject: [patch] nfsd: don't allow zero length strings in cache_parse()

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 <dan.carpenter@...cle.com>

diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c
index 465df9a..8c6598e 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';

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