netdev - [PATCH 2/7] nfc: llcp: nullify llcp_sock->dev on connect() error paths

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20220115122650.128182-3-krzysztof.kozlowski@canonical.com>
Date:   Sat, 15 Jan 2022 13:26:45 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, linux-nfc@...ts.01.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/7] nfc: llcp: nullify llcp_sock->dev on connect() error paths

Nullify the llcp_sock->dev on llcp_sock_connect() error paths,
symmetrically to the code llcp_sock_bind().  The non-NULL value of
llcp_sock->dev is used in a few places to check whether the socket is
still valid.

There was no particular issue observed with missing NULL assignment in
connect() error path, however an similar case - in the bind() error path
- was triggereable.  That one was fixed in commit 4ac06a1e013c ("nfc:
fix NULL ptr dereference in llcp_sock_getname() after failed connect"),
so the change here seems logical as well.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
---
 net/nfc/llcp_sock.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/nfc/llcp_sock.c b/net/nfc/llcp_sock.c
index 0b93a17b9f11..e92440c0c4c7 100644
--- a/net/nfc/llcp_sock.c
+++ b/net/nfc/llcp_sock.c
@@ -764,6 +764,7 @@ static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr,
 	llcp_sock->local = NULL;
 
 put_dev:
+	llcp_sock->dev = NULL;
 	nfc_put_device(dev);
 
 error:
-- 
2.32.0