On Tue, Mar 07, 2023 at 06:02:02PM +0100, Greg Kroah-Hartman wrote:
From: Jan Kara jack@suse.cz
commit 0813299c586b175d7edb25f56412c54b812d0379 upstream.
When we are renaming a directory to a different directory, we need to update '..' entry in the moved directory. However nothing prevents moved directory from being modified and even converted from the inline format to the normal format. When such race happens the rename code gets confused and we crash. Fix the problem by locking the moved directory.
CC: stable@vger.kernel.org Fixes: 32f7f22c0b52 ("ext4: let ext4_rename handle inline dir") Signed-off-by: Jan Kara jack@suse.cz Link: https://lore.kernel.org/r/20230126112221.11866-1-jack@suse.cz Signed-off-by: Theodore Ts'o tytso@mit.edu Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
This commit has a reported regression (https://lore.kernel.org/linux-ext4/5efbe1b9-ad8b-4a4f-b422-24824d2b775c@kili...), so probably it should not be backported quite yet.
- Eric