sgi-xp: fix writing past the end of kzalloc()'d space

A missing type cast results in writing way beyond the end of a kzalloc()'d
memory segment resulting in slab corruption. But it seems like the better
solution is to define ->recv_msg_slots as a 'void *' rather than a
'struct xpc_notify_mq_msg_uv *' and add the type cast.

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>

1 files changed, 5 insertions, 6 deletions

diff --git a/drivers/misc/sgi-xp/xpc_uv.c b/drivers/misc/sgi-xp/xpc_uv.c
index f17f7d40ea2c..29c0502a96b2 100644
--- a/drivers/misc/sgi-xp/xpc_uv.c
+++ b/drivers/misc/sgi-xp/xpc_uv.c
@@ -3,7 +3,7 @@
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
  *
- * Copyright (c) 2008 Silicon Graphics, Inc.  All Rights Reserved.
+ * Copyright (c) 2008-2009 Silicon Graphics, Inc.  All Rights Reserved.
  */
 
 /*
@@ -1010,8 +1010,8 @@ xpc_allocate_recv_msg_slot_uv(struct xpc_channel *ch)
                         continue;
 
                 for (entry = 0; entry < nentries; entry++) {
-                        msg_slot = ch_uv->recv_msg_slots + entry *
-                            ch->entry_size;
+                        msg_slot = ch_uv->recv_msg_slots +
+                            entry * ch->entry_size;
 
                         msg_slot->hdr.msg_slot_number = entry;
                 }
@@ -1308,9 +1308,8 @@ xpc_handle_notify_mq_msg_uv(struct xpc_partition *part,
         /* we're dealing with a normal message sent via the notify_mq */
         ch_uv = &ch->sn.uv;
 
-        msg_slot = (struct xpc_notify_mq_msg_uv *)((u64)ch_uv->recv_msg_slots +
-                    (msg->hdr.msg_slot_number % ch->remote_nentries) *
-                    ch->entry_size);
+        msg_slot = ch_uv->recv_msg_slots +
+            (msg->hdr.msg_slot_number % ch->remote_nentries) * ch->entry_size;
 
         BUG_ON(msg->hdr.msg_slot_number != msg_slot->hdr.msg_slot_number);
         BUG_ON(msg_slot->hdr.size != 0);