linux-kernel - [PATCH 1/2] RDMA/ocrdma: Fix an error code in ocrdma_alloc

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Date:   Thu, 13 Jul 2017 10:46:14 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Selvin Xavier <selvin.xavier@...adcom.com>,
        Naresh Gottumukkala <bgottumukkala@...lex.com>
Cc:     Devesh Sharma <devesh.sharma@...adcom.com>,
        Doug Ledford <dledford@...hat.com>,
        Sean Hefty <sean.hefty@...el.com>,
        Hal Rosenstock <hal.rosenstock@...il.com>,
        Leon Romanovsky <leon@...nel.org>,
        Dasaratharaman Chandramouli 
        <dasaratharaman.chandramouli@...el.com>,
        Niranjana Vishwanathapura <niranjana.vishwanathapura@...el.com>,
        Artemy Kovalyov <artemyko@...lanox.com>,
        Or Gerlitz <ogerlitz@...lanox.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        ssh10 <mayhs11saini@...il.com>, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 1/2] RDMA/ocrdma: Fix an error code in ocrdma_alloc_pd()

We should preserve the original "status" error code instead of resetting
it to zero.  Returning ERR_PTR(0) is the same as NULL and results in a
NULL dereference in the callers.  I added a printk() on error instead.

Fixes: 45e86b33ec8b ("RDMA/ocrdma: Cache recv DB until QP moved to RTR")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c b/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c
index 2f30bda8457a..cc317e858040 100644
--- a/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c
+++ b/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c
@@ -744,7 +744,8 @@ struct ib_pd *ocrdma_alloc_pd(struct ib_device *ibdev,
 	if (is_uctx_pd) {
 		ocrdma_release_ucontext_pd(uctx);
 	} else {
-		status = _ocrdma_dealloc_pd(dev, pd);
+		if (_ocrdma_dealloc_pd(dev, pd))
+			pr_err("%s: _ocrdma_dealloc_pd() failed\n", __func__);
 	}
 exit:
 	return ERR_PTR(status);