Commits on Sep 22, 2021

1. ext4: fix race writing to an inline_data file while its xattrs are ch… …

   …anging
   
   commit a54c4613dac1500b40e4ab55199f7c51f028e848 upstream.
   
   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: f19d587 ("ext4: add normal write support for inline data")
   Reported-by: syzbot+13146364637c7363a7de@syzkaller.appspotmail.com
   Signed-off-by: Theodore Ts'o <tytso@mit.edu>
   Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

   

   tytso authored and JeevakaPrabu committed Sep 22, 2021
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