linux-kernel - [PATCH] RDMA/ocrdma: fix double free on pd

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Message-Id: <1433515647-28059-1-git-send-email-colin.king@canonical.com>
Date:	Fri,  5 Jun 2015 15:47:27 +0100
From:	Colin King <colin.king@...onical.com>
To:	Selvin Xavier <selvin.xavier@...lex.com>,
	Devesh Sharma <devesh.sharma@...lex.com>,
	Mitesh Ahuja <mitesh.ahuja@...lex.com>,
	Doug Ledford <dledford@...hat.com>,
	Sean Hefty <sean.hefty@...el.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	linux-rdma@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] RDMA/ocrdma: fix double free on pd

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

A reorganisation of the PD allocation and deallocation in commit
9ba1377daa ("RDMA/ocrdma: Move PD resource management to driver.")
introduced a double free on pd, as detected by static analysis by
smatch:

drivers/infiniband/hw/ocrdma/ocrdma_verbs.c:682 ocrdma_alloc_pd()
  error: double free of 'pd'^

The original call to ocrdma_mbx_dealloc_pd() (which does not kfree
pd) was replaced with a call to _ocrdma_dealloc_pd() (which does
kfree pd).  The kfree following this call causes the double free,
so just remove it to fix the problem.

Fixes: 9ba1377daa ("RDMA/ocrdma: Move PD resource management to driver.")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/infiniband/hw/ocrdma/ocrdma_verbs.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c b/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c
index 9dcb660..219f212 100644
--- a/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c
+++ b/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c
@@ -679,7 +679,6 @@ err:
 		ocrdma_release_ucontext_pd(uctx);
 	} else {
 		status = _ocrdma_dealloc_pd(dev, pd);
-		kfree(pd);
 	}
 exit:
 	return ERR_PTR(status);
-- 
2.1.4

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