linux-kernel - [ 065/180] nfsd: dont allow zero length strings in cache

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Message-Id: <20121001225200.363096738@1wt.eu>
Date:	Tue, 02 Oct 2012 00:53:02 +0200
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Dan Carpenter <dan.carpenter@...cle.com>,
	"J. Bruce Fields" <bfields@...hat.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Willy Tarreau <w@....eu>
Subject: [ 065/180] nfsd: dont allow zero length strings in cache_parse()

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

------------------

From: Dan Carpenter <dan.carpenter@...cle.com>

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 <dan.carpenter@...cle.com>
Signed-off-by: J. Bruce Fields <bfields@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Willy Tarreau <w@....eu>
---
 net/sunrpc/cache.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c
index 25f7801..e3fea46 100644
--- a/net/sunrpc/cache.c
+++ b/net/sunrpc/cache.c
@@ -719,6 +719,8 @@ 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';
-- 
1.7.2.1.45.g54fbc



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