5.1-stable patches

[thirdparty/kernel/stable-queue.git] / releases / 2.6.27.14 / sgi-xpc-remove-null-pointer-dereference.patch

From 17e2161654da4e6bdfd8d53d4f52e820ee93f423 Mon Sep 17 00:00:00 2001
From: Robin Holt <holt@sgi.com>
Date: Thu, 29 Jan 2009 14:25:07 -0800
Subject: sgi-xpc: Remove NULL pointer dereference.

From: Robin Holt <holt@sgi.com>

commit 17e2161654da4e6bdfd8d53d4f52e820ee93f423 upstream.

If the bte copy fails, the attempt to retrieve payloads merely returns a
null pointer deref and not NULL as was expected.

Signed-off-by: Robin Holt <holt@sgi.com>
Signed-off-by: Dean Nelson <dcn@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 drivers/misc/sgi-xp/xpc_sn2.c |   10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

--- a/drivers/misc/sgi-xp/xpc_sn2.c
+++ b/drivers/misc/sgi-xp/xpc_sn2.c
@@ -1962,11 +1962,13 @@ xpc_get_deliverable_payload_sn2(struct x
 
 			msg = xpc_pull_remote_msg_sn2(ch, get);
 
-			DBUG_ON(msg != NULL && msg->number != get);
-			DBUG_ON(msg != NULL && (msg->flags & XPC_M_SN2_DONE));
-			DBUG_ON(msg != NULL && !(msg->flags & XPC_M_SN2_READY));
+			if (msg != NULL) {
+				DBUG_ON(msg->number != get);
+				DBUG_ON(msg->flags & XPC_M_SN2_DONE);
+				DBUG_ON(!(msg->flags & XPC_M_SN2_READY));
 
-			payload = &msg->payload;
+				payload = &msg->payload;
+			}
 			break;
 		}