diff options
| author | fanchaoting <fanchaoting@cn.fujitsu.com> | 2013-03-21 09:15:30 +0800 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2013-04-10 03:20:01 +0100 |
| commit | 8626d723c5495ec9a276c8c13a22b374c421ba72 (patch) | |
| tree | c879e3b376be6363d842150dd8728617de74c84c /fs | |
| parent | 4f9347e4b59bdc29b17ff6c4b377195f208402b2 (diff) | |
pnfs-block: removing DM device maybe cause oops when call dev_remove
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<fanchaoting@cn.fujitsu.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
[bwh: Backported to 3.2:
- In dev_remove(), msg is a structure not a pointer to it]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/nfs/blocklayout/blocklayoutdm.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/nfs/blocklayout/blocklayoutdm.c b/fs/nfs/blocklayout/blocklayoutdm.c index d055c7558073..7326e6ec0dc4 100644 --- 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) { |