From: Michael S. Tsirkin Date: Wed, 2 May 2007 12:31:12 +0000 (+0300) Subject: IPoIB/cm: Don't crash if remote side uses one QP for both directions X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=d6ef7d68f6f51c5b9de01c542dab8b90067a9c27;p=linux-beck.git IPoIB/cm: Don't crash if remote side uses one QP for both directions The IPoIB CM spec allows the use of a single connection in both active->passive and passive->active directions. The current Linux code uses one connection for both directions, but if another node only uses one connection for both directions, we oops when we try to look up the passive connection. Fix by checking that qp_context is non-NULL before dereferencing it. Signed-off-by: Michael S. Tsirkin --- diff --git a/drivers/infiniband/ulp/ipoib/ipoib_cm.c b/drivers/infiniband/ulp/ipoib/ipoib_cm.c index 76717410660e..1e27930077e6 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_cm.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_cm.c @@ -370,7 +370,7 @@ void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc) if (!likely(wr_id & IPOIB_CM_RX_UPDATE_MASK)) { p = wc->qp->qp_context; - if (time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) { + if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) { spin_lock_irqsave(&priv->lock, flags); p->jiffies = jiffies; /* Move this entry to list head, but do