linux-kernel - [PATCH] nvme-rdma: fix null pointer dereference on req->mr

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Message-Id: <20160905152438.14299-1-colin.king@canonical.com>
Date:   Mon,  5 Sep 2016 16:24:38 +0100
From:   Colin King <colin.king@...onical.com>
To:     Keith Busch <keith.busch@...el.com>, Jens Axboe <axboe@...com>,
        linux-nvme@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] nvme-rdma: fix null pointer dereference on req->mr

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

If there is an error on req->mr, req->mr is set to null, however
the following statement sets req->mr->need_inval causing a null
pointer dereference.  Fix this by bailing out to label 'out' to
immediately return and hence skip over the offending null pointer
dereference.

Fixes: f5b7b559e1488 ("nvme-rdma: Get rid of duplicate variable")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/nvme/host/rdma.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c
index ab545fb..162b8c0 100644
--- a/drivers/nvme/host/rdma.c
+++ b/drivers/nvme/host/rdma.c
@@ -291,6 +291,7 @@ static int nvme_rdma_reinit_request(void *data, struct request *rq)
 	if (IS_ERR(req->mr)) {
 		ret = PTR_ERR(req->mr);
 		req->mr = NULL;
+		goto out;
 	}
 
 	req->mr->need_inval = false;
-- 
2.9.3