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

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Date:   Fri,  2 Feb 2018 16:48:47 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Steve French <sfrench@...ba.org>
Cc:     Martin Sebor <msebor@....gnu.org>, Arnd Bergmann <arnd@...db.de>,
        Pavel Shilovsky <pshilov@...rosoft.com>,
        Ronnie Sahlberg <lsahlber@...hat.com>,
        Aurelien Aptel <aaptel@...e.com>,
        Long Li <longli@...rosoft.com>,
        Samuel Cabrero <scabrero@...e.de>,
        Sachin Prabhu <sprabhu@...hat.com>, linux-cifs@...r.kernel.org,
        samba-technical@...ts.samba.org, linux-kernel@...r.kernel.org
Subject: [PATCH] cifs: silence compiler warnings showing up with gcc-8.0.0

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>
---
 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 72d71703f1e8..78bc86c315ec 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -6343,9 +6343,7 @@ CIFSSMBSetEA(const unsigned int xid, struct cifs_tcon *tcon,
 	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;
-- 
2.9.0