[PATCH 5.13 015/151] cifs: create sd context must be a multiple of 8

Greg Kroah-Hartman
2021-08-16T13:19:56Z

From: Shyam Prasad N <sprasad@microsoft.com>

commit 7d3fc01796fc895e5fcce45c994c5a8db8120a8d upstream.

We used to follow the rule earlier that the create SD context
always be a multiple of 8. However, with the change:
cifs: refactor create_sd_buf() and and avoid corrupting the buffer
...we recompute the length, and we failed that rule.
Fixing that with this change.

Cc: <stable@vger.kernel.org> # v5.10+
Signed-off-by: Shyam Prasad N <sprasad@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/cifs/smb2pdu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -2375,7 +2375,7 @@ create_sd_buf(umode_t mode, bool set_own
memcpy(aclptr, &acl, sizeof(struct cifs_acl));

buf->ccontext.DataLength = cpu_to_le32(ptr - (__u8 *)&buf->sd);
- *len = ptr - (__u8 *)buf;
+ *len = roundup(ptr - (__u8 *)buf, 8);

return buf;
}