efivarfs: use I_MUTEX_CHILD nested lock to traverse variables on resume

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syzbot warns about a potential deadlock, but this is a false positive
resulting from a missing lockdep annotation: iterate_dir() locks the
parent whereas the inode_lock() it warns about locks the child, which is
guaranteed to be a different lock.

So use inode_lock_nested() instead with the appropriate lock class.

Reported-by: syzbot+019072ad24ab1d948228@syzkaller.appspotmail.com
Suggested-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>

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Ard Biesheuvel 2025-03-17 08:23:11 +01:00

parent cb16dfed00

commit dec1277875

1 changed files with 1 additions and 1 deletions

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fs/efivarfs/super.c

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