linux-kernel - [PATCH] AFS: Fix possible null pointer dereference in afs_alloc

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Message-ID: <20100601161538.2174.57858.stgit@warthog.procyon.org.uk>
Date:	Tue, 01 Jun 2010 17:15:39 +0100
From:	David Howells <dhowells@...hat.com>
To:	torvalds@...l.org, akpm@...ux-foundation.org
Cc:	linux-afs@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Denis Kirjanov <dkirjanov@...nel.org>,
	David Howells <dhowells@...hat.com>
Subject: [PATCH] AFS: Fix possible null pointer dereference in
	afs_alloc_server()

From: Denis Kirjanov <dkirjanov@...a.kernel.org>

Fix a possible null pointer dereference in afs_alloc_server(): the server
pointer is NULL if there was an allocation failure, and under such a
condition, we can't dereference it in the _leave() statement.

Signed-off-by: Denis Kirjanov <dkirjanov@...nel.org>
Signed-off-by: David Howells <dhowells@...hat.com>
---

 fs/afs/server.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/afs/server.c b/fs/afs/server.c
index f490995..9fdc7fe 100644
--- a/fs/afs/server.c
+++ b/fs/afs/server.c
@@ -91,9 +91,10 @@ static struct afs_server *afs_alloc_server(struct afs_cell *cell,
 
 		memcpy(&server->addr, addr, sizeof(struct in_addr));
 		server->addr.s_addr = addr->s_addr;
+		_leave(" = %p{%d}", server, atomic_read(&server->usage));
+	} else {
+		_leave(" = NULL [nomem]");
 	}
-
-	_leave(" = %p{%d}", server, atomic_read(&server->usage));
 	return server;
 }
 

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