cifs: possible memory leak in xattr.

Memory is allocated irrespective of whether CIFS_ACL is configured
or not. But free is happenning only if CIFS_ACL is set. This is a
possible memory leak scenario.

Fix is:
Allocate and free memory only if CIFS_ACL is configured.

Signed-off-by: Santosh Nayak <santoshprasadnayak@gmail.com>
Reviewed-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

diff --git a/fs/cifs/xattr.c b/fs/cifs/xattr.c
index 45f07c4..10d92cf 100644 (file)
--- a/fs/cifs/xattr.c
+++ b/fs/cifs/xattr.c
@@ -105,7 +105,6 @@ int cifs_setxattr(struct dentry *direntry, const char *ea_name,
        struct cifs_tcon *pTcon;
        struct super_block *sb;
        char *full_path;
-       struct cifs_ntsd *pacl;
 
        if (direntry == NULL)
                return -EIO;
@@ -164,23 +163,24 @@ int cifs_setxattr(struct dentry *direntry, const char *ea_name,
                        cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
        } else if (strncmp(ea_name, CIFS_XATTR_CIFS_ACL,
                        strlen(CIFS_XATTR_CIFS_ACL)) == 0) {
+#ifdef CONFIG_CIFS_ACL
+               struct cifs_ntsd *pacl;
                pacl = kmalloc(value_size, GFP_KERNEL);
                if (!pacl) {
                        cFYI(1, "%s: Can't allocate memory for ACL",
                                        __func__);
                        rc = -ENOMEM;
                } else {
-#ifdef CONFIG_CIFS_ACL
                        memcpy(pacl, ea_value, value_size);
                        rc = set_cifs_acl(pacl, value_size,
                                direntry->d_inode, full_path, CIFS_ACL_DACL);
                        if (rc == 0) /* force revalidate of the inode */
                                CIFS_I(direntry->d_inode)->time = 0;
                        kfree(pacl);
+               }
 #else
                        cFYI(1, "Set CIFS ACL not supported yet");
 #endif /* CONFIG_CIFS_ACL */
-               }
        } else {
                int temp;
                temp = strncmp(ea_name, POSIX_ACL_XATTR_ACCESS,