linux-kernel - [PATCH] qedr: return -EINVAL if pd is null and avoid null ptr dereference

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Message-Id: <20161018183928.8539-1-colin.king@canonical.com>
Date:   Tue, 18 Oct 2016 19:39:28 +0100
From:   Colin King <colin.king@...onical.com>
To:     Doug Ledford <dledford@...hat.com>,
        Sean Hefty <sean.hefty@...el.com>,
        Hal Rosenstock <hal.rosenstock@...il.com>,
        Rajesh Borundia <rajesh.borundia@...ium.com>,
        Ram Amrani <Ram.Amrani@...ium.com>, linux-rdma@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] qedr: return -EINVAL if pd is null and avoid null ptr dereference

From: Colin Ian King <colin.king@...onical.com>

Currently, if pd is null then we hit a null pointer derference
on accessing pd->pd_id.  Instead of just printing an error message
we should also return -EINVAL immediately.

Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/infiniband/hw/qedr/verbs.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/qedr/verbs.c b/drivers/infiniband/hw/qedr/verbs.c
index a615142..b2a0eb8 100644
--- a/drivers/infiniband/hw/qedr/verbs.c
+++ b/drivers/infiniband/hw/qedr/verbs.c
@@ -511,8 +511,10 @@ int qedr_dealloc_pd(struct ib_pd *ibpd)
 	struct qedr_dev *dev = get_qedr_dev(ibpd->device);
 	struct qedr_pd *pd = get_qedr_pd(ibpd);
 
-	if (!pd)
+	if (!pd) {
 		pr_err("Invalid PD received in dealloc_pd\n");
+		return -EINVAL;
+	}
 
 	DP_DEBUG(dev, QEDR_MSG_INIT, "Deallocating PD %d\n", pd->pd_id);
 	dev->ops->rdma_dealloc_pd(dev->rdma_ctx, pd->pd_id);
-- 
2.9.3