[PATCH 1/3] smb: client: use unaligned reads in parse_posix_ctxt()

From: Zihan Xi <[email protected]>

The server controls create-context DataOffset, so the POSIX context data
pointer may be misaligned on strict-alignment architectures. Use
get_unaligned_le32() when reading nlink, reparse_tag, and mode.

Fixes: 69dda3059e7a ("cifs: add SMB2_open() arg to return POSIX data")
Cc: [email protected]
Signed-off-by: Zihan Xi <[email protected]>
Signed-off-by: Ren Wei <[email protected]>
---
 fs/smb/client/smb2pdu.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/smb/client/smb2pdu.c b/fs/smb/client/smb2pdu.c
index 3c7691b39377..ed782d219d55 100644
--- a/fs/smb/client/smb2pdu.c
+++ b/fs/smb/client/smb2pdu.c
@@ -2396,9 +2396,9 @@ parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info,
 
 	memset(posix, 0, sizeof(*posix));
 
-	posix->nlink = le32_to_cpu(*(__le32 *)(beg + 0));
-	posix->reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4));
-	posix->mode = le32_to_cpu(*(__le32 *)(beg + 8));
+	posix->nlink = get_unaligned_le32(beg);
+	posix->reparse_tag = get_unaligned_le32(beg + 4);
+	posix->mode = get_unaligned_le32(beg + 8);
 
 	sid = beg + 12;
 	sid_len = posix_info_sid_size(sid, end);
-- 
2.43.0