ext4: Fix possible corruption when moving a directory

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[ Upstream commit 0813299c58 ]

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: 32f7f22c0b ("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: Sasha Levin <sashal@kernel.org>

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Jan Kara 2023-01-26 12:22:21 +01:00 • committed by Greg Kroah-Hartman

parent 17e98a5ede

commit b0bb136122

1 changed files with 10 additions and 1 deletions

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fs/ext4/namei.c

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