[CIFS] Add missing check for path name allocation failure. Remove four

redundant null pointer checks before cifs_buf_release.

Found by coverity analyzer.

Signed-off-by: Steve French (sfrench@us.ibm.com)

fs/cifs/cifssmb.c

@@ -415,14 +415,15 @@ CIFSSMBNegotiate(unsigned int xid, struct cifsSesInfo *ses)
 			if(server->secMode & SECMODE_SIGN_REQUIRED)
 				cERROR(1,
 				 ("Server requires /proc/fs/cifs/PacketSigningEnabled"));
-			server->secMode &= ~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED);
+			server->secMode &= ~(SECMODE_SIGN_ENABLED | 
+							SECMODE_SIGN_REQUIRED);
 		} else if(sign_CIFS_PDUs == 1) {
 			if((server->secMode & SECMODE_SIGN_REQUIRED) == 0)
-				server->secMode &= ~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED);
+				server->secMode &= ~(SECMODE_SIGN_ENABLED |
+							 SECMODE_SIGN_REQUIRED);
 		}
 				
 	}
-	if (pSMB)
 	cifs_buf_release(pSMB);
 	return rc;
 }
@@ -537,9 +538,8 @@ CIFSSMBLogoff(const int xid, struct cifsSesInfo *ses)
 			rc = -ESHUTDOWN;
 		}
 	}
-	if (pSMB)
+	up(&ses->sesSem)	
 	cifs_small_buf_release(pSMB);
-	up(&ses->sesSem);
 
 	/* if session dead then we do not need to do ulogoff,
 		since server closed smb session, no sense reporting 
@@ -1796,7 +1796,6 @@ CIFSSMBQueryReparseLinkInfo(const int xid, struct cifsTconInfo *tcon,
 		}
 	}
 qreparse_out:
-	if (pSMB)
 	cifs_buf_release(pSMB);
 
 	/* Note: On -EAGAIN error only caller can retry on handle based calls
@@ -2520,11 +2519,10 @@ CIFSFindFirst(const int xid, struct cifsTconInfo *tcon,
 	rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
 			 (struct smb_hdr *) pSMBr, &bytes_returned, 0);
 
-	if (rc) {/* BB add logic to retry regular search if Unix search rejected unexpectedly by server */
+	if (rc) {/* BB add logic to retry regular search if Unix search 
+			rejected unexpectedly by server */
 		/* BB Add code to handle unsupported level rc */
 		cFYI(1, ("Error in FindFirst = %d", rc));
-
-		if (pSMB)
 		cifs_buf_release(pSMB);
 
 		/* BB eventually could optimize out free and realloc of buf */

fs/cifs/dir.c

@@ -226,7 +226,8 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode,
 		}
 
 		if (rc != 0) {
-			cFYI(1,("Create worked but get_inode_info failed with rc = %d",
+			cFYI(1,
+			     ("Create worked but get_inode_info failed rc = %d",
 			      rc));
 		} else {
 			direntry->d_op = &cifs_dentry_ops;
@@ -303,8 +304,7 @@ int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode, dev_t dev
 	up(&direntry->d_sb->s_vfs_rename_sem);
 	if(full_path == NULL)
 		rc = -ENOMEM;
-	
-	if (full_path && (pTcon->ses->capabilities & CAP_UNIX)) {
+	else if (pTcon->ses->capabilities & CAP_UNIX) {
 		if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
 			rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path,
 				mode,(__u64)current->euid,(__u64)current->egid,