From: David Disseldorp <ddiss@suse.de>
Date: Wed, 13 Dec 2017 17:22:30 +0000 (+0100)
Subject: target/iscsi: avoid NULL dereference in CHAP auth error path
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=4cbb9fdf133cc5a5dcb1ac7153791792976c62c9;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

target/iscsi: avoid NULL dereference in CHAP auth error path

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 <elfring@users.sourceforge.net>
Signed-off-by: David Disseldorp <ddiss@suse.de>
Cc: stable@vger.kernel.org # 4.6+
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/target/iscsi/iscsi_target_auth.c b/drivers/target/iscsi/iscsi_target_auth.c
index f9bc8ec6fb6b..9518ffd8b8ba 100644
--- a/drivers/target/iscsi/iscsi_target_auth.c
+++ b/drivers/target/iscsi/iscsi_target_auth.c
@@ -421,7 +421,8 @@ 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;