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: [PATCH] sgi-xpc: Remove NULL pointer dereference.
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>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
drivers/misc/sgi-xp/xpc_sn2.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/misc/sgi-xp/xpc_sn2.c b/drivers/misc/sgi-xp/xpc_sn2.c
index 7aafb8a91945..7d05fb5f4fee 100644
--- a/drivers/misc/sgi-xp/xpc_sn2.c
+++ b/drivers/misc/sgi-xp/xpc_sn2.c
@@ -1957,11 +1957,13 @@ xpc_get_deliverable_payload_sn2(struct xpc_channel *ch)
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;
}