linux-kernel - [PATCH 3.4 058/176] KEYS: Fix stale key registration at error path

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Message-Id: <1428569224-23820-58-git-send-email-lizf@kernel.org>
Date:	Thu,  9 Apr 2015 16:45:06 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Takashi Iwai <tiwai@...e.de>,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 058/176] KEYS: Fix stale key registration at error path

From: Takashi Iwai <tiwai@...e.de>

3.4.107-rc1 review patch.  If anyone has any objections, please let me know.

------------------


commit b26bdde5bb27f3f900e25a95e33a0c476c8c2c48 upstream.

When loading encrypted-keys module, if the last check of
aes_get_sizes() in init_encrypted() fails, the driver just returns an
error without unregistering its key type.  This results in the stale
entry in the list.  In addition to memory leaks, this leads to a kernel
crash when registering a new key type later.

This patch fixes the problem by swapping the calls of aes_get_sizes()
and register_key_type(), and releasing resources properly at the error
paths.

Bugzilla: https://bugzilla.opensuse.org/show_bug.cgi?id=908163
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Mimi Zohar <zohar@...ux.vnet.ibm.com>
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 security/keys/encrypted-keys/encrypted.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/security/keys/encrypted-keys/encrypted.c b/security/keys/encrypted-keys/encrypted.c
index 2d1bb8a..a02f923 100644
--- a/security/keys/encrypted-keys/encrypted.c
+++ b/security/keys/encrypted-keys/encrypted.c
@@ -1016,10 +1016,13 @@ static int __init init_encrypted(void)
 	ret = encrypted_shash_alloc();
 	if (ret < 0)
 		return ret;
+	ret = aes_get_sizes();
+	if (ret < 0)
+		goto out;
 	ret = register_key_type(&key_type_encrypted);
 	if (ret < 0)
 		goto out;
-	return aes_get_sizes();
+	return 0;
 out:
 	encrypted_shash_release();
 	return ret;
-- 
1.9.1

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