3.6.11.2 stable review patch.
If anyone has any objections, please let me know.
------------------
From: fanchaoting <fanchaot...@cn.fujitsu.com>
[ Upstream commit 4376c94618c26225e69e17b7c91169c45a90b292 ]
when pnfs block using device mapper,if umounting later,it maybe
cause oops. we apply "1 + sizeof(bl_umount_request)" memory for
msg->data, the memory maybe overflow when we do "memcpy(&dataptr
[sizeof(bl_msg)], &bl_umount_request, sizeof(bl_umount_request))",
because the size of bl_msg is more than 1 byte.
Signed-off-by: fanchaoting<fanchaot...@cn.fujitsu.com>
Cc: sta...@vger.kernel.org
Signed-off-by: Trond Myklebust <trond.mykleb...@netapp.com>
Signed-off-by: Steven Rostedt <rost...@goodmis.org>
---
fs/nfs/blocklayout/blocklayoutdm.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/fs/nfs/blocklayout/blocklayoutdm.c
b/fs/nfs/blocklayout/blocklayoutdm.c
index 737d839..6fc7b5c 100644
--- a/fs/nfs/blocklayout/blocklayoutdm.c
+++ b/fs/nfs/blocklayout/blocklayoutdm.c
@@ -55,7 +55,8 @@ static void dev_remove(struct net *net, dev_t dev)
bl_pipe_msg.bl_wq = &nn->bl_wq;
memset(msg, 0, sizeof(*msg));
- msg->data = kzalloc(1 + sizeof(bl_umount_request), GFP_NOFS);
+ msg->len = sizeof(bl_msg) + bl_msg.totallen;
+ msg->data = kzalloc(msg->len, GFP_NOFS);
if (!msg->data)
goto out;
@@ -66,7 +67,6 @@ static void dev_remove(struct net *net, dev_t dev)
memcpy(msg->data, &bl_msg, sizeof(bl_msg));
dataptr = (uint8_t *) msg->data;
memcpy(&dataptr[sizeof(bl_msg)], &bl_umount_request,
sizeof(bl_umount_request));
- msg->len = sizeof(bl_msg) + bl_msg.totallen;
add_wait_queue(&nn->bl_wq, &wq);
if (rpc_queue_upcall(nn->bl_device_pipe, msg) < 0) {
--
1.7.10.4
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