Merge git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6:
  cifs: fix pointer initialization and checks in cifs_follow_symlink (try #4)

Author: torvalds

fs/cifs/cifssmb.c

@@ -2475,7 +2475,7 @@ CIFSSMBUnixQuerySymLink(const int xid, struct cifsTconInfo *tcon,
 			/* BB FIXME investigate remapping reserved chars here */
 			*symlinkinfo = cifs_strndup_from_ucs(data_start, count,
 						    is_unicode, nls_codepage);
-			if (!symlinkinfo)
+			if (!*symlinkinfo)
 				rc = -ENOMEM;
 		}
 	}

fs/cifs/link.c

@@ -107,48 +107,48 @@ void *
 cifs_follow_link(struct dentry *direntry, struct nameidata *nd)
 {
 	struct inode *inode = direntry->d_inode;
-	int rc = -EACCES;
+	int rc = -ENOMEM;
 	int xid;
 	char *full_path = NULL;
-	char *target_path = ERR_PTR(-ENOMEM);
-	struct cifs_sb_info *cifs_sb;
-	struct cifsTconInfo *pTcon;
+	char *target_path = NULL;
+	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+	struct cifsTconInfo *tcon = cifs_sb->tcon;
 
 	xid = GetXid();
 
-	full_path = build_path_from_dentry(direntry);
+	/*
+	 * For now, we just handle symlinks with unix extensions enabled.
+	 * Eventually we should handle NTFS reparse points, and MacOS
+	 * symlink support. For instance...
+	 *
+	 * rc = CIFSSMBQueryReparseLinkInfo(...)
+	 *
+	 * For now, just return -EACCES when the server doesn't support posix
+	 * extensions. Note that we still allow querying symlinks when posix
+	 * extensions are manually disabled. We could disable these as well
+	 * but there doesn't seem to be any harm in allowing the client to
+	 * read them.
+	 */
+	if (!(tcon->ses->capabilities & CAP_UNIX)) {
+		rc = -EACCES;
+		goto out;
+	}
 
+	full_path = build_path_from_dentry(direntry);
 	if (!full_path)
 		goto out;
 
 	cFYI(1, ("Full path: %s inode = 0x%p", full_path, inode));
-	cifs_sb = CIFS_SB(inode->i_sb);
-	pTcon = cifs_sb->tcon;
-
-	/* We could change this to:
-		if (pTcon->unix_ext)
-	   but there does not seem any point in refusing to
-	   get symlink info if we can, even if unix extensions
-	   turned off for this mount */
-
-	if (pTcon->ses->capabilities & CAP_UNIX)
-		rc = CIFSSMBUnixQuerySymLink(xid, pTcon, full_path,
-					     &target_path,
-					     cifs_sb->local_nls);
-	else {
-		/* BB add read reparse point symlink code here */
-		/* rc = CIFSSMBQueryReparseLinkInfo */
-		/* BB Add code to Query ReparsePoint info */
-		/* BB Add MAC style xsymlink check here if enabled */
-	}
 
+	rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, &target_path,
+				     cifs_sb->local_nls);
+	kfree(full_path);
+out:
 	if (rc != 0) {
 		kfree(target_path);
 		target_path = ERR_PTR(rc);
 	}
 
-	kfree(full_path);
-out:
 	FreeXid(xid);
 	nd_set_link(nd, target_path);
 	return NULL;