From 1b205c2d2464bfecbba80227e74b412596dc5521 Mon Sep 17 00:00:00 2001 From: Roland Dreier <roland@eddore.topspincom.com> Date: Fri, 9 Sep 2005 20:52:00 -0700 Subject: [PATCH] [PATCH] IB: fix CM use-after-free If the CM REQ handling function gets to error2, then it frees cm_id_priv->timewait_info. But the next line goes through ib_destroy_cm_id() -> ib_send_cm_rej() -> cm_reset_to_idle(), which ends up calling cm_cleanup_timewait(), which dereferences the pointer we just freed. Make sure we clear cm_id_priv->timewait_info after freeing it, so that doesn't happen. Signed-off-by: Roland Dreier <rolandd@cisco.com> --- drivers/infiniband/core/cm.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/infiniband/core/cm.c b/drivers/infiniband/core/cm.c index 96136543aa4ed..54db6d4831f1a 100644 --- a/drivers/infiniband/core/cm.c +++ b/drivers/infiniband/core/cm.c @@ -1315,6 +1315,7 @@ error3: atomic_dec(&cm_id_priv->refcount); cm_deref_id(listen_cm_id_priv); cm_cleanup_timewait(cm_id_priv->timewait_info); error2: kfree(cm_id_priv->timewait_info); + cm_id_priv->timewait_info = NULL; error1: ib_destroy_cm_id(&cm_id_priv->id); return ret; } -- GitLab