netdev - [PATCH 05/10] 9P/RDMA: Protect against duplicate replies

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: <1372770684-25573-6-git-send-email-simon.derr@bull.net>
Date:	Tue,  2 Jul 2013 15:11:19 +0200
From:	Simon Derr <simon.derr@...l.net>
To:	netdev@...r.kernel.org
Cc:	simon.derr@...l.net, ericvh@...il.com
Subject: [PATCH 05/10] 9P/RDMA: Protect against duplicate replies

A well-behaved server would not send twice the reply to a request.
But if it ever happens...
This additional check prevents the kernel from leaking memory
and possibly more nasty consequences in that unlikely event.

Signed-off-by: Simon Derr <simon.derr@...l.net>
---
 net/9p/trans_rdma.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/net/9p/trans_rdma.c b/net/9p/trans_rdma.c
index b8b66d3..274a9c1 100644
--- a/net/9p/trans_rdma.c
+++ b/net/9p/trans_rdma.c
@@ -294,6 +294,13 @@ handle_recv(struct p9_client *client, struct p9_trans_rdma *rdma,
 	if (!req)
 		goto err_out;
 
+	/* Check that we have not yet received a reply for this request.
+	 */
+	if (unlikely(req->rc)) {
+		pr_err("Duplicate reply for request %d", tag);
+		goto err_out;
+	}
+
 	req->rc = c->rc;
 	req->status = REQ_STATUS_RCVD;
 	p9_client_cb(client, req);
-- 
1.7.2.2

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html