Btrfs: deal with NULL acl sent to btrfs_set_acl



It is legal for btrfs_set_acl to be sent a NULL acl.  This
makes sure we don't dereference it.  A similar patch was sent by
Johannes Hirte <johannes.hirte@fem.tu-ilmenau.de>

Signed-off-by: Chris Mason <chris.mason@oracle.com>

parent 6c090a11

fs/btrfs/acl.c

+7 −5

Original line number	Diff line number	Diff line
		@@ -112,12 +112,14 @@ static int btrfs_set_acl(struct btrfs_trans_handle *trans,
		switch (type) {
		case ACL_TYPE_ACCESS:
		mode = inode->i_mode;
		name = POSIX_ACL_XATTR_ACCESS;
		if (acl) {
		ret = posix_acl_equiv_mode(acl, &mode);
		if (ret < 0)
		return ret;
		ret = 0;
		inode->i_mode = mode;
		name = POSIX_ACL_XATTR_ACCESS;
		}
		ret = 0;
		break;
		case ACL_TYPE_DEFAULT:
		if (!S_ISDIR(inode->i_mode))