linux-kernel - [PATCH 4.19 17/96] net/tls: prevent bad memory access in tls_is_sk_tx_device

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Date:   Wed, 24 Apr 2019 19:09:22 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Dirk van der Merwe <dirk.vandermerwe@...ronome.com>,
        Simon Horman <simon.horman@...ronome.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.19 17/96] net/tls: prevent bad memory access in tls_is_sk_tx_device_offloaded()

From: Jakub Kicinski <jakub.kicinski@...ronome.com>

[ Upstream commit b4f47f3848eb70986f75d06112af7b48b7f5f462 ]

Unlike '&&' operator, the '&' does not have short-circuit
evaluation semantics.  IOW both sides of the operator always
get evaluated.  Fix the wrong operator in
tls_is_sk_tx_device_offloaded(), which would lead to
out-of-bounds access for for non-full sockets.

Fixes: 4799ac81e52a ("tls: Add rx inline crypto offload")
Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
Reviewed-by: Dirk van der Merwe <dirk.vandermerwe@...ronome.com>
Reviewed-by: Simon Horman <simon.horman@...ronome.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 include/net/tls.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/include/net/tls.h
+++ b/include/net/tls.h
@@ -317,7 +317,7 @@ tls_validate_xmit_skb(struct sock *sk, s
 static inline bool tls_is_sk_tx_device_offloaded(struct sock *sk)
 {
 #ifdef CONFIG_SOCK_VALIDATE_XMIT
-	return sk_fullsock(sk) &
+	return sk_fullsock(sk) &&
 	       (smp_load_acquire(&sk->sk_validate_xmit_skb) ==
 	       &tls_validate_xmit_skb);
 #else