linux-kernel - [patch] afs: potential null dereference

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Message-ID: <20100320111938.GT5331@bicker>
Date:	Sat, 20 Mar 2010 14:19:38 +0300
From:	Dan Carpenter <error27@...il.com>
To:	David Howells <dhowells@...hat.com>
Cc:	linux-afs@...ts.infradead.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [patch] afs: potential null dereference

It seems clear from the surrounding code that xpermits is allowed to be 
NULL here.

Signed-off-by: Dan Carpenter <error27@...il.com>

diff --git a/fs/afs/security.c b/fs/afs/security.c
index 3ef5043..bb4ed14 100644
--- a/fs/afs/security.c
+++ b/fs/afs/security.c
@@ -189,8 +189,9 @@ void afs_cache_permit(struct afs_vnode *vnode, struct key *key, long acl_order)
 	if (!permits)
 		goto out_unlock;
 
-	memcpy(permits->permits, xpermits->permits,
-	       count * sizeof(struct afs_permit));
+	if (xpermits)
+		memcpy(permits->permits, xpermits->permits,
+			count * sizeof(struct afs_permit));
 
 	_debug("key %x access %x",
 	       key_serial(key), vnode->status.caller_access);
--
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