cifs: properly handle case where CIFSGetSrvInodeNumber fails

...if it does then we pass a pointer to an unintialized variable for
the inode number to cifs_new_inode. Have it pass a NULL pointer instead.

Also tweak the function prototypes to reduce the amount of casting.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

3 files changed, 14 insertions, 15 deletions

diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 62fd5bd499f6..446e62cbece9 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -92,8 +92,7 @@ extern u64 cifs_UnixTimeToNT(struct timespec);
 extern __le64 cnvrtDosCifsTm(__u16 date, __u16 time);
 extern struct timespec cnvrtDosUnixTm(__u16 date, __u16 time);
 
-extern struct inode *cifs_new_inode(struct super_block *sb,
-                                    unsigned long *inum);
+extern struct inode *cifs_new_inode(struct super_block *sb, __u64 *inum);
 extern int cifs_get_inode_info(struct inode **pinode,
                         const unsigned char *search_path,
                         FILE_ALL_INFO *pfile_info,
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index c7674f595adb..475115c7cc79 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -213,7 +213,7 @@ static void fill_fake_finddataunix(FILE_UNIX_BASIC_INFO *pfnd_dat,
  * guaranteed to be unique.
  */
 struct inode *
-cifs_new_inode(struct super_block *sb, unsigned long *inum)
+cifs_new_inode(struct super_block *sb, __u64 *inum)
 {
         struct inode *inode;
 
@@ -228,7 +228,7 @@ cifs_new_inode(struct super_block *sb, unsigned long *inum)
          *     if serverino is disabled, perhaps we should be using iunique()?
          */
         if (inum && (CIFS_SB(sb)->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM))
-                inode->i_ino = *inum;
+                inode->i_ino = (unsigned long) *inum;
 
         /*
          * must set this here instead of cifs_alloc_inode since VFS will
@@ -276,8 +276,7 @@ int cifs_get_inode_info_unix(struct inode **pinode,
 
         /* get new inode */
         if (*pinode == NULL) {
-                *pinode = cifs_new_inode(sb, (unsigned long *)
-                                                &find_data.UniqueId);
+                *pinode = cifs_new_inode(sb, &find_data.UniqueId);
                 if (*pinode == NULL) {
                         rc = -ENOMEM;
                         goto cgiiu_exit;
@@ -499,6 +498,7 @@ int cifs_get_inode_info(struct inode **pinode,
         /* get new inode */
         if (*pinode == NULL) {
                 __u64 inode_num;
+                __u64 *pinum = &inode_num;
 
                 /* Is an i_ino of zero legal? Can we use that to check
                    if the server supports returning inode numbers?  Are
@@ -518,20 +518,20 @@ int cifs_get_inode_info(struct inode **pinode,
                         int rc1 = 0;
 
                         rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
-                                        full_path, &inode_num,
+                                        full_path, pinum,
                                         cifs_sb->local_nls,
                                         cifs_sb->mnt_cifs_flags &
                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
                         if (rc1) {
                                 cFYI(1, ("GetSrvInodeNum rc %d", rc1));
+                                pinum = NULL;
                                 /* BB EOPNOSUPP disable SERVER_INUM? */
                         }
-                        *pinode = cifs_new_inode(sb, (unsigned long *)
-                                                        &inode_num);
                 } else {
-                        *pinode = cifs_new_inode(sb, NULL);
+                        pinum = NULL;
                 }
 
+                *pinode = cifs_new_inode(sb, pinum);
                 if (*pinode == NULL) {
                         rc = -ENOMEM;
                         goto cgii_exit;
@@ -1148,8 +1148,8 @@ int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
                         else
                                 direntry->d_op = &cifs_dentry_ops;
 
-                        newinode = cifs_new_inode(inode->i_sb, (unsigned long *)
-                                                        &pInfo->UniqueId);
+                        newinode = cifs_new_inode(inode->i_sb,
+                                                  &pInfo->UniqueId);
                         if (newinode == NULL) {
                                 kfree(pInfo);
                                 goto mkdir_get_info;
diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
index 02a20221e841..c2c01ff4c32c 100644
--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -61,7 +61,7 @@ static inline void dump_cifs_file_struct(struct file *file, char *label)
 static int
 construct_dentry(struct qstr *qstring, struct file *file,
                  struct inode **ptmp_inode, struct dentry **pnew_dentry,
-                 unsigned long *inum)
+                 __u64 *inum)
 {
         struct dentry *tmp_dentry = NULL;
         struct super_block *sb = file->f_path.dentry->d_sb;
@@ -820,7 +820,7 @@ static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
 /* inode num, inode type and filename returned */
 static int cifs_get_name_from_search_buf(struct qstr *pqst,
         char *current_entry, __u16 level, unsigned int unicode,
-        struct cifs_sb_info *cifs_sb, int max_len, ino_t *pinum)
+        struct cifs_sb_info *cifs_sb, int max_len, __u64 *pinum)
 {
         int rc = 0;
         unsigned int len = 0;
@@ -903,7 +903,7 @@ static int cifs_filldir(char *pfindEntry, struct file *file,
         struct qstr qstring;
         struct cifsFileInfo *pCifsF;
         unsigned int obj_type;
-        ino_t  inum;
+        __u64  inum;
         struct cifs_sb_info *cifs_sb;
         struct inode *tmp_inode;
         struct dentry *tmp_dentry;