linux-kernel - [PATCH AUTOSEL for 4.9 280/293] cifs: silence compiler warnings showing up with gcc-8.0.0

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Date:   Mon, 9 Apr 2018 00:26:34 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Arnd Bergmann <arnd@...db.de>, Steve French <smfrench@...il.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.9 280/293] cifs: silence compiler warnings
 showing up with gcc-8.0.0

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

[ Upstream commit ade7db991b47ab3016a414468164f4966bd08202 ]

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: Sasha Levin <alexander.levin@...rosoft.com>
---
 fs/cifs/cifssmb.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index cc420d6b71f7..d57222894892 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -6413,9 +6413,7 @@ 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;
-- 
2.15.1