netdev - [PATCH net v2] sctp: Fix a big endian bug in sctp_diag

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-ID: <20170925101926.db4f6x4hblh7tcvo@mwanda>
Date:   Mon, 25 Sep 2017 13:19:26 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Vlad Yasevich <vyasevich@...il.com>,
        Xin Long <lucien.xin@...il.com>
Cc:     Neil Horman <nhorman@...driver.com>,
        "David S. Miller" <davem@...emloft.net>,
        linux-sctp@...r.kernel.org, netdev@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: [PATCH net v2] sctp: Fix a big endian bug in sctp_diag_dump()

The sctp_for_each_transport() function takes an pointer to int.  The
cb->args[] array holds longs so it's only using the high 32 bits.  It
works on little endian system but will break on big endian 64 bit
machines.

Fixes: d25adbeb0cdb ("sctp: fix an use-after-free issue in sctp_sock_dump")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
v2: The v1 patch changed the function to take a long pointer, but v2
    just changes the caller.

diff --git a/net/sctp/sctp_diag.c b/net/sctp/sctp_diag.c
index 22ed01a76b19..a72a7d925d46 100644
--- a/net/sctp/sctp_diag.c
+++ b/net/sctp/sctp_diag.c
@@ -463,6 +463,7 @@ static void sctp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
 		.r = r,
 		.net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN),
 	};
+	int pos = cb->args[2];
 
 	/* eps hashtable dumps
 	 * args:
@@ -493,7 +494,8 @@ static void sctp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
 		goto done;
 
 	sctp_for_each_transport(sctp_sock_filter, sctp_sock_dump,
-				net, (int *)&cb->args[2], &commp);
+				net, &pos, &commp);
+	cb->args[2] = pos;
 
 done:
 	cb->args[1] = cb->args[4];