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author | Theodore Ts'o <tytso@mit.edu> | 2021-08-21 06:44:17 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-09-08 09:52:38 +0300 |
commit | f8ea208b3fbbc0546d71b47e8abaf98b0961dec1 (patch) | |
tree | 8e140d8d9b5a122c7c95e4fd7fb7d7643b2ceabe /fs | |
parent | 66a613c5173456fe0edfa1a89147381d2802d4e4 (diff) | |
download | linux-f8ea208b3fbbc0546d71b47e8abaf98b0961dec1.tar.xz |
ext4: fix race writing to an inline_data file while its xattrs are changing
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: f19d5870cbf72 ("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>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/ext4/inline.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c index 70cb64db33f7..24e994e75f5c 100644 --- a/fs/ext4/inline.c +++ b/fs/ext4/inline.c @@ -750,6 +750,12 @@ int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len, ext4_write_lock_xattr(inode, &no_expand); BUG_ON(!ext4_has_inline_data(inode)); + /* + * ei->i_inline_off may have changed since ext4_write_begin() + * called ext4_try_to_write_inline_data() + */ + (void) ext4_find_inline_data_nolock(inode); + kaddr = kmap_atomic(page); ext4_write_inline_data(inode, &iloc, kaddr, pos, len); kunmap_atomic(kaddr); |