3.2.43-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: fanchaoting <fanchaot...@cn.fujitsu.com>
commit 4376c94618c26225e69e17b7c91169c45a90b292 upstream.
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>
Signed-off-by: Trond Myklebust <trond.mykleb...@netapp.com>
[bwh: Backported to 3.2:
- In dev_remove(), msg is a structure not a pointer to it]
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
fs/nfs/blocklayout/blocklayoutdm.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/fs/nfs/blocklayout/blocklayoutdm.c
+++ b/fs/nfs/blocklayout/blocklayoutdm.c
@@ -52,7 +52,8 @@ static void dev_remove(dev_t dev)
dprintk("Entering %s\n", __func__);
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;
@@ -63,7 +64,6 @@ static void dev_remove(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(&bl_wq, &wq);
if (rpc_queue_upcall(bl_device_pipe->d_inode, &msg) < 0) {
--
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