• Theodore Ts'o's avatar
    ext4: fix race writing to an inline_data file while its xattrs are changing · a54c4613
    Theodore Ts'o authored
    The location of the system.data extended attribute can change whenever
    xattr_sem is not taken.  So we need to recalculate the i_inline_off
    field since it mgiht have changed between ext4_write_begin() and
    ext4_write_end().
    
    This means that caching i_inline_off is probably not helpful, so in
    the long run we should probably get rid of it and shrink the in-memory
    ext4 inode slightly, but let's fix the race the simple way for now.
    
    Cc: stable@kernel.org
    Fixes: f19d5870
    
     ("ext4: add normal write support for inline data")
    Reported-by: syzbot+13146364637c7363a7de@syzkaller.appspotmail.com
    Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
    a54c4613