From 29963437a48475036353b95ab142bf199adb909e Mon Sep 17 00:00:00 2001 From: Sean Hefty Date: Wed, 23 Feb 2011 08:17:40 -0800 Subject: [Dapper] [CVE-2011-0695] [PATCH 1/1] IB/cm: Bump reference count on cm_id before invoking callback, CVE-2011-0695 CVE-2011-0695 BugLink: http://bugs.launchpad.net/bugs/770369 When processing a SIDR REQ, the ib_cm allocates a new cm_id. The refcount of the cm_id is initialized to 1. However, cm_process_work will decrement the refcount after invoking all callbacks. The result is that the cm_id will end up with refcount set to 0 by the end of the sidr req handler. If a user tries to destroy the cm_id, the destruction will proceed, under the incorrect assumption that no other threads are referencing the cm_id. This can lead to a crash when the cm callback thread tries to access the cm_id. This problem was noticed as part of a larger investigation with kernel crashes in the rdma_cm when running on a real time OS. Signed-off-by: Sean Hefty Acked-by: Doug Ledford Cc: Signed-off-by: Roland Dreier (backported from commit 29963437a48475036353b95ab142bf199adb909e) Signed-off-by: Brad Figg --- drivers/infiniband/core/cm.c | 1 + 1 files changed, 1 insertions(+), 0 deletions(-) diff --git a/drivers/infiniband/core/cm.c b/drivers/infiniband/core/cm.c index 02110e0..c777dbd 100644 --- a/drivers/infiniband/core/cm.c +++ b/drivers/infiniband/core/cm.c @@ -2648,6 +2648,7 @@ static int cm_sidr_req_handler(struct cm_work *work) goto out; /* No match. */ } atomic_inc(&cur_cm_id_priv->refcount); + atomic_inc(&cm_id_priv->refcount); spin_unlock_irqrestore(&cm.lock, flags); cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler; -- 1.7.0.4