[PATCH] prevent CVE-2012-2372 rds-ping causes kernel panic

From: Jay Fenlason
Date: Mon Oct 22 2012 - 14:12:48 EST

If you use rds-ping of the local IP address of some Infiniband HCAs
(QLogic, possibly others) the machine will panic with a BUG_ON due to
an overly restrictive check. Loosen the restriction a bit

This should have gotten sent a while ago (it was first noticed in
and patched in kernel-2.6.32-275.el6) but I got confused about its
embargo status and lost it.

Signed-off-by: Jay Fenlason <fenlason@xxxxxxxxxx>

diff --git a/net/rds/ib_send.c b/net/rds/ib_send.c
index e590949..7920c85 100644
--- a/net/rds/ib_send.c
+++ b/net/rds/ib_send.c
@@ -544,7 +544,7 @@ int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
int flow_controlled = 0;
int nr_sig = 0;

+ BUG_ON(!conn->c_loopback && off % RDS_FRAG_SIZE);
BUG_ON(hdr_off != 0 && hdr_off != sizeof(struct rds_header));

/* Do not send cong updates to IB loopback */
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