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Date: Sun, 15 Nov 2015 01:45:45 +0000 From: Ben Hutchings <ben@...adent.org.uk> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org CC: akpm@...ux-foundation.org, "Doron Tsur" <doront@...lanox.com>, "Doug Ledford" <dledford@...hat.com>, "Matan Barak" <matanb@...lanox.com> Subject: [PATCH 3.2 38/60] IB/cm: Fix rb-tree duplicate free and use-after-free 3.2.73-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Doron Tsur <doront@...lanox.com> commit 0ca81a2840f77855bbad1b9f172c545c4dc9e6a4 upstream. ib_send_cm_sidr_rep could sometimes erase the node from the sidr (depending on errors in the process). Since ib_send_cm_sidr_rep is called both from cm_sidr_req_handler and cm_destroy_id, cm_id_priv could be either erased from the rb_tree twice or not erased at all. Fixing that by making sure it's erased only once before freeing cm_id_priv. Fixes: a977049dacde ('[PATCH] IB: Add the kernel CM implementation') Signed-off-by: Doron Tsur <doront@...lanox.com> Signed-off-by: Matan Barak <matanb@...lanox.com> Signed-off-by: Doug Ledford <dledford@...hat.com> Signed-off-by: Ben Hutchings <ben@...adent.org.uk> --- drivers/infiniband/core/cm.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) --- a/drivers/infiniband/core/cm.c +++ b/drivers/infiniband/core/cm.c @@ -856,6 +856,11 @@ retest: case IB_CM_SIDR_REQ_RCVD: spin_unlock_irq(&cm_id_priv->lock); cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT); + spin_lock_irq(&cm.lock); + if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) + rb_erase(&cm_id_priv->sidr_id_node, + &cm.remote_sidr_table); + spin_unlock_irq(&cm.lock); break; case IB_CM_REQ_SENT: ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); @@ -3092,7 +3097,10 @@ int ib_send_cm_sidr_rep(struct ib_cm_id spin_unlock_irqrestore(&cm_id_priv->lock, flags); spin_lock_irqsave(&cm.lock, flags); - rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); + if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) { + rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); + RB_CLEAR_NODE(&cm_id_priv->sidr_id_node); + } spin_unlock_irqrestore(&cm.lock, flags); return 0; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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