linux-ext4 - [PATCH v3 3/3] ext4 crypto: add missing locking for keyring

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Message-Id: <1449759879-2166-4-git-send-email-tytso@mit.edu>
Date:	Thu, 10 Dec 2015 10:04:39 -0500
From:	Theodore Ts'o <tytso@....edu>
To:	Ext4 Developers List <linux-ext4@...r.kernel.org>
Cc:	mhalcrow@...gle.com, Theodore Ts'o <tytso@....edu>,
	stable@...nel.org
Subject: [PATCH v3 3/3] ext4 crypto: add missing locking for keyring_key access

Cc: stable@...nel.org
Signed-off-by: Theodore Ts'o <tytso@....edu>
---
 fs/ext4/crypto_key.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/ext4/crypto_key.c b/fs/ext4/crypto_key.c
index 039b22d..f96a57a 100644
--- a/fs/ext4/crypto_key.c
+++ b/fs/ext4/crypto_key.c
@@ -213,9 +213,11 @@ retry:
 		res = -ENOKEY;
 		goto out;
 	}
+	down_read(&keyring_key->sem);
 	ukp = user_key_payload(keyring_key);
 	if (ukp->datalen != sizeof(struct ext4_encryption_key)) {
 		res = -EINVAL;
+		up_read(&keyring_key->sem);
 		goto out;
 	}
 	master_key = (struct ext4_encryption_key *)ukp->data;
@@ -226,10 +228,12 @@ retry:
 			    "ext4: key size incorrect: %d\n",
 			    master_key->size);
 		res = -ENOKEY;
+		up_read(&keyring_key->sem);
 		goto out;
 	}
 	res = ext4_derive_key_aes(ctx.nonce, master_key->raw,
 				  raw_key);
+	up_read(&keyring_key->sem);
 	if (res)
 		goto out;
 got_key:
-- 
2.5.0

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