linux-kernel - [PATCH 3.16 217/410] cifs: silence compiler warnings showing up with gcc-8.0.0

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Date:   Thu, 07 Jun 2018 15:05:21 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Arnd Bergmann" <arnd@...db.de>,
        "Steve French" <smfrench@...il.com>
Subject: [PATCH 3.16 217/410] cifs: silence compiler warnings showing up
 with gcc-8.0.0

3.16.57-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Arnd Bergmann <arnd@...db.de>

commit ade7db991b47ab3016a414468164f4966bd08202 upstream.

This bug was fixed before, but came up again with the latest
compiler in another function:

fs/cifs/cifssmb.c: In function 'CIFSSMBSetEA':
fs/cifs/cifssmb.c:6362:3: error: 'strncpy' offset 8 is out of the bounds [0, 4] [-Werror=array-bounds]
   strncpy(parm_data->list[0].name, ea_name, name_len);

Let's apply the same fix that was used for the other instances.

Fixes: b2a3ad9ca502 ("cifs: silence compiler warnings showing up with gcc-4.7.0")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Steve French <smfrench@...il.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 fs/cifs/cifssmb.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -6366,9 +6366,7 @@ SetEARetry:
 	pSMB->InformationLevel =
 		cpu_to_le16(SMB_SET_FILE_EA);
 
-	parm_data =
-		(struct fealist *) (((char *) &pSMB->hdr.Protocol) +
-				       offset);
+	parm_data = (void *)pSMB + offsetof(struct smb_hdr, Protocol) + offset;
 	pSMB->ParameterOffset = cpu_to_le16(param_offset);
 	pSMB->DataOffset = cpu_to_le16(offset);
 	pSMB->SetupCount = 1;