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author | Stephen Rothwell <sfr@canb.auug.org.au> | 2018-09-03 06:15:58 +0300 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-10-10 09:52:12 +0300 |
commit | 8c47defad8510820d609a66d1c8d3cac64913ac5 (patch) | |
tree | 6f2b09a6726e182b23f2d91c9d7392d911eaeb8c /fs/cifs | |
parent | ec5947c8aa7ae9a821f973552a1b48580ae30549 (diff) | |
download | linux-8c47defad8510820d609a66d1c8d3cac64913ac5.tar.xz |
fs/cifs: suppress a string overflow warning
[ Upstream commit bcfb84a996f6fa90b5e6e2954b2accb7a4711097 ]
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>
Diffstat (limited to 'fs/cifs')
-rw-r--r-- | fs/cifs/cifssmb.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c index 63aea21e6298..b9b8f19dce0e 100644 --- a/fs/cifs/cifssmb.c +++ b/fs/cifs/cifssmb.c @@ -577,10 +577,15 @@ 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); |