From 3534b8508e4b21eec0b7b839f7234a9b6fe27d03 Mon Sep 17 00:00:00 2001
From: Jeff Layton <jlayton@redhat.com>
Date: Fri, 24 May 2013 07:41:01 -0400
Subject: [PATCH] cifs: throw a warning if negotiate or sess_setup ops are
passed NULL server or session pointers
These look pretty cargo-culty to me, but let's be certain. Leave
them in place for now. Pop a WARN if it ever does happen. Also,
move to a more standard idiom for setting the "server" pointer.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Reviewed-by: Pavel Shilovsky <piastry@etersoft.ru>
Signed-off-by: Steve French <sfrench@us.ibm.com>
---
fs/cifs/cifssmb.c | 11 +++++------
fs/cifs/sess.c | 4 +++-
fs/cifs/smb2pdu.c | 20 ++++++++------------
3 files changed, 16 insertions(+), 19 deletions(-)
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index a58dc77cc443..c1c2006376a1 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -375,16 +375,15 @@ CIFSSMBNegotiate(const unsigned int xid, struct cifs_ses *ses)
int rc = 0;
int bytes_returned;
int i;
- struct TCP_Server_Info *server;
+ struct TCP_Server_Info *server = ses->server;
u16 count;
unsigned int secFlags;
- if (ses->server)
- server = ses->server;
- else {
- rc = -EIO;
- return rc;
+ if (!server) {
+ WARN(1, "%s: server is NULL!\n", __func__);
+ return -EIO;
}
+
rc = smb_init(SMB_COM_NEGOTIATE, 0, NULL /* no tcon yet */ ,
(void **) &pSMB, (void **) &pSMBr);
if (rc)
diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c
index 838e2240fc55..e8c5dc9f3386 100644
--- a/fs/cifs/sess.c
+++ b/fs/cifs/sess.c
@@ -576,8 +576,10 @@ CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
u16 blob_len;
char *ntlmsspblob = NULL;
- if (ses == NULL)
+ if (ses == NULL) {
+ WARN(1, "%s: ses == NULL!", __func__);
return -EINVAL;
+ }
type = ses->server->secType;
cifs_dbg(FYI, "sess setup type %d\n", type);
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 2b95ce2b54e8..3af66aa18d3b 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -328,7 +328,7 @@ SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
struct kvec iov[1];
int rc = 0;
int resp_buftype;
- struct TCP_Server_Info *server;
+ struct TCP_Server_Info *server = ses->server;
unsigned int sec_flags;
u16 temp = 0;
int blob_offset, blob_length;
@@ -337,11 +337,9 @@ SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
cifs_dbg(FYI, "Negotiate protocol\n");
- if (ses->server)
- server = ses->server;
- else {
- rc = -EIO;
- return rc;
+ if (!server) {
+ WARN(1, "%s: server is NULL!\n", __func__);
+ return -EIO;
}
rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
@@ -480,7 +478,7 @@ SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
int rc = 0;
int resp_buftype;
__le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
- struct TCP_Server_Info *server;
+ struct TCP_Server_Info *server = ses->server;
unsigned int sec_flags;
u8 temp = 0;
u16 blob_length = 0;
@@ -490,11 +488,9 @@ SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
cifs_dbg(FYI, "Session Setup\n");
- if (ses->server)
- server = ses->server;
- else {
- rc = -EIO;
- return rc;
+ if (!server) {
+ WARN(1, "%s: server is NULL!\n", __func__);
+ return -EIO;
}
/*