ext4: correct max_inline_xattr_value_size computing

If the ext4 inode does not have xattr space, 0 is returned in the
get_max_inline_xattr_value_size function. Otherwise, the function returns
a negative value when the inode does not contain EXT4_STATE_XATTR.

Cc: stable@kernel.org
Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20220616021358.2504451-4-libaokun1@huawei.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c
index 1fa36cbe09ecc04486f9ef04c6ef911deab5fc61..a4fbe825694b10bc0d477fbc897813b523d0cf2e 100644 (file)
--- a/fs/ext4/inline.c
+++ b/fs/ext4/inline.c
@@ -36,6 +36,9 @@ static int get_max_inline_xattr_value_size(struct inode *inode,
        struct ext4_inode *raw_inode;
        int free, min_offs;
 
+       if (!EXT4_INODE_HAS_XATTR_SPACE(inode))
+               return 0;
+
        min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
                        EXT4_GOOD_OLD_INODE_SIZE -
                        EXT4_I(inode)->i_extra_isize -