From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x227OAafk3wuMKYbtwRBSGRE9ZMtlRX1zgDV6+lTFxdEugfP6i+a0FcxrdxbVqWjiZOXVcdIQ ARC-Seal: i=1; a=rsa-sha256; t=1519217681; cv=none; d=google.com; s=arc-20160816; b=wJ4aq1rWDn1BjmTxx7HsPxgQuBgWroJJtWL3y63bbtz7EW0FvfOs0qSNoFGaQ/mL3I AcKMaFwb2yOBoTpVloi6RJYMEhaY32oAwxbUttYno0NduPn7AKh2/9Jdljgv1fA1A7fI tqQGwZHYfciTRD2y5GnKMlcsz1moTQ6lujDsYb6GK+F44r1h90ryJskDPsGvS8X9xFQV pyFoXATAM9iloOtmIOTRxqJJxrsGowIN3mlFZu5ZUy6tD76UG69nHxuUqYhyJWf3fZJr OZcYVFY2Z8O6xt1OHGyNVbi6aZcq4AmCqBvOGseVfdKP127um+2QQZfMNcByhdQasu77 Gb/w== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:user-agent:references:in-reply-to:message-id:date :subject:cc:to:from:arc-authentication-results; bh=OHv0djUL33R2Vj9DcSrVOLmdt/QgOn1U1tOPZyUp4zw=; b=MB5XrxaucKMYkJhToBxjKAJht0bxkrkM8lUUjsTpvYIdvw881xEiJhXipRvuNuf+JN Xr098Zap0yduxLhM8pPYRR7Sx7k6fcxdgacnVxg3lbvm6mIj4TrGnxvWXD9iS4UW29vQ BtMHDZY40Gk7azUJxjIJcboA3mMEsZQpNN61VzcUGWlF7uPNmBcJoPIeqRxuSWVEZr3X l83A6NUCFJjrbxpzEcLbF9yct6LyDQl5Y9NG8RnFFqzOD9yf4UkKSnfFg7OcYZ1MMl9O pvErx6r27ZtDyFNtW6mBHspCIRCXRUfTNM5M78kNEjdcfVLsXTlec6v/dE6QV6Jq5Qu2 Z6fA== ARC-Authentication-Results: i=1; mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 90.92.71.90 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 90.92.71.90 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Markus Elfring , David Disseldorp , Nicholas Bellinger Subject: [PATCH 4.9 17/77] target/iscsi: avoid NULL dereference in CHAP auth error path Date: Wed, 21 Feb 2018 13:48:26 +0100 Message-Id: <20180221124432.904654100@linuxfoundation.org> X-Mailer: git-send-email 2.16.2 In-Reply-To: <20180221124432.172390020@linuxfoundation.org> References: <20180221124432.172390020@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-LABELS: =?utf-8?b?IlxcU2VudCI=?= X-GMAIL-THRID: =?utf-8?q?1593015199328743705?= X-GMAIL-MSGID: =?utf-8?q?1593015199328743705?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: David Disseldorp commit ce512d79d0466a604793addb6b769d12ee326822 upstream. If chap_server_compute_md5() fails early, e.g. via CHAP_N mismatch, then crypto_free_shash() is called with a NULL pointer which gets dereferenced in crypto_shash_tfm(). Fixes: 69110e3cedbb ("iscsi-target: Use shash and ahash") Suggested-by: Markus Elfring Signed-off-by: David Disseldorp Cc: stable@vger.kernel.org # 4.6+ Signed-off-by: Nicholas Bellinger Signed-off-by: Greg Kroah-Hartman --- drivers/target/iscsi/iscsi_target_auth.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/target/iscsi/iscsi_target_auth.c +++ b/drivers/target/iscsi/iscsi_target_auth.c @@ -413,7 +413,8 @@ static int chap_server_compute_md5( auth_ret = 0; out: kzfree(desc); - crypto_free_shash(tfm); + if (tfm) + crypto_free_shash(tfm); kfree(challenge); kfree(challenge_binhex); return auth_ret;