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fs/cifs: suppress a string overflow warning

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[ Upstream commit bcfb84a996 ]

A powerpc build of cifs with gcc v8.2.0 produces this warning:

fs/cifs/cifssmb.c: In function ‘CIFSSMBNegotiate’:
fs/cifs/cifssmb.c:605:3: warning: ‘strncpy’ writing 16 bytes into a region of size 1 overflows the destination [-Wstringop-overflow=]
   strncpy(pSMB->DialectsArray+count, protocols[i].name, 16);
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Since we are already doing a strlen() on the source, change the strncpy
to a memcpy().

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stephen Rothwell
2018-09-03 13:15:58 +10:00
committed by Greg Kroah-Hartman
parent 3941dbe190
commit a5bdc726e5
1 changed files with 8 additions and 3 deletions
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11
fs/cifs/cifssmb.c
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@@ -589,10 +589,15 @@ CIFSSMBNegotiate(const unsigned int xid, struct cifs_ses *ses)
}
count = 0;
/*
* We know that all the name entries in the protocols array
* are short (< 16 bytes anyway) and are NUL terminated.
*/
for (i = 0; i < CIFS_NUM_PROT; i++) {
strncpy(pSMB->DialectsArray+count, protocols[i].name, 16);
count += strlen(protocols[i].name) + 1;
/* null at end of source and target buffers anyway */
size_t len = strlen(protocols[i].name) + 1;
memcpy(pSMB->DialectsArray+count, protocols[i].name, len);
count += len;
}
inc_rfc1001_len(pSMB, count);
pSMB->ByteCount = cpu_to_le16(count);