linux-kernel - [PATCH v1 1/1] smb: client: Rework memcpy() to avoid compilation error

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Message-Id: <20230717100003.11824-1-andriy.shevchenko@linux.intel.com>
Date:   Mon, 17 Jul 2023 13:00:03 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Steve French <stfrench@...rosoft.com>, linux-cifs@...r.kernel.org,
        samba-technical@...ts.samba.org, linux-kernel@...r.kernel.org
Cc:     Steve French <sfrench@...ba.org>,
        Paulo Alcantara <pc@...guebit.com>,
        Ronnie Sahlberg <lsahlber@...hat.com>,
        Shyam Prasad N <sprasad@...rosoft.com>,
        Tom Talpey <tom@...pey.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v1 1/1] smb: client: Rework memcpy() to avoid compilation error

In function ‘fortify_memcpy_chk’,
    inlined from ‘CIFS_open’ at fs/smb/client/cifssmb.c:1249:3:
include/linux/fortify-string.h:592:25: error: call to ‘__read_overflow2_field’ declared with attribute warning: detected read beyond size of field (2nd parameter); maybe use struct_group()? [-Werror=attribute-warning]
  592 |                         __read_overflow2_field(q_size_field, size);
      |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors

Instead of memcpy() use member-by-member copy. Let compiler do its job
on optimisation.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 fs/smb/client/cifssmb.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/fs/smb/client/cifssmb.c b/fs/smb/client/cifssmb.c
index 9dee267f1893..33ebb63826d3 100644
--- a/fs/smb/client/cifssmb.c
+++ b/fs/smb/client/cifssmb.c
@@ -1245,8 +1245,11 @@ CIFS_open(const unsigned int xid, struct cifs_open_parms *oparms, int *oplock,
 		*oplock |= CIFS_CREATE_ACTION;
 
 	if (buf) {
-		/* copy from CreationTime to Attributes */
-		memcpy((char *)buf, (char *)&rsp->CreationTime, 36);
+		buf->CreationTime = rsp->CreationTime;
+		buf->LastAccessTime = rsp->LastAccessTime;
+		buf->LastWriteTime = rsp->LastWriteTime;
+		buf->ChangeTime = rsp->ChangeTime;
+		buf->FileAttributes = rsp->FileAttributes;
 		/* the file_info buf is endian converted by caller */
 		buf->AllocationSize = rsp->AllocationSize;
 		buf->EndOfFile = rsp->EndOfFile;
-- 
2.40.0.1.gaa8946217a0b