linux-kernel - [PATCH AUTOSEL 6.1 12/21] fs/super.c: stop calling fscrypt_destroy_keyring() from __put

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Message-Id: <20230226034256.771769-12-sashal@kernel.org>
Date:   Sat, 25 Feb 2023 22:42:47 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Eric Biggers <ebiggers@...gle.com>,
        Sasha Levin <sashal@...nel.org>, viro@...iv.linux.org.uk,
        linux-fsdevel@...r.kernel.org
Subject: [PATCH AUTOSEL 6.1 12/21] fs/super.c: stop calling fscrypt_destroy_keyring() from __put_super()

From: Eric Biggers <ebiggers@...gle.com>

[ Upstream commit ec64036e68634231f5891faa2b7a81cdc5dcd001 ]

Now that the key associated with the "test_dummy_operation" mount option
is added on-demand when it's needed, rather than immediately when the
filesystem is mounted, fscrypt_destroy_keyring() no longer needs to be
called from __put_super() to avoid a memory leak on mount failure.

Remove this call, which was causing confusion because it appeared to be
a sleep-in-atomic bug (though it wasn't, for a somewhat-subtle reason).

Signed-off-by: Eric Biggers <ebiggers@...gle.com>
Link: https://lore.kernel.org/r/20230208062107.199831-5-ebiggers@kernel.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/super.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/fs/super.c b/fs/super.c
index 4f8a626a35cd9..76d47620b930d 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -291,7 +291,6 @@ static void __put_super(struct super_block *s)
 		WARN_ON(s->s_inode_lru.node);
 		WARN_ON(!list_empty(&s->s_mounts));
 		security_sb_free(s);
-		fscrypt_destroy_keyring(s);
 		put_user_ns(s->s_user_ns);
 		kfree(s->s_subtype);
 		call_rcu(&s->rcu, destroy_super_rcu);
-- 
2.39.0