linux-kernel - [PATCH] ib umem: bugfix: mixed put_pid()s in ib_umem

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Date:   Thu, 29 Dec 2016 10:24:43 +0800
From:   Kenneth Lee <liguozhu@...ilicon.com>
To:     <dledford@...hat.com>, <sean.hefty@...el.com>,
        <hal.rosenstock@...il.com>
CC:     <robin.murphy@....com>, <jroedel@...e.de>, <egtvedt@...fundet.no>,
        <vgupta@...opsys.com>, <liguozhu@...ilicon.com>,
        <dave.hansen@...ux.intel.com>, <lstoakes@...il.com>,
        <krzk@...nel.org>, <sebott@...ux.vnet.ibm.com>,
        <markb@...lanox.com>, <linux-rdma@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] ib umem: bugfix: mixed put_pid()s in ib_umem_get()

There are two bugfixes in this patch:

1. When the execution go to the ib_umem_odp_get() path, pid should be put
   back.
2. When the memory allocation fail, the pid also should be put back before
   exit.

Signed-off-by: Kenneth Lee <liguozhu@...ilicon.com>
---
 drivers/infiniband/core/umem.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c
index 1e62a5f..4609b92 100644
--- a/drivers/infiniband/core/umem.c
+++ b/drivers/infiniband/core/umem.c
@@ -134,6 +134,7 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
 		 IB_ACCESS_REMOTE_ATOMIC | IB_ACCESS_MW_BIND));
 
 	if (access & IB_ACCESS_ON_DEMAND) {
+		put_pid(umem->pid);
 		ret = ib_umem_odp_get(context, umem);
 		if (ret) {
 			kfree(umem);
@@ -149,6 +150,7 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
 
 	page_list = (struct page **) __get_free_page(GFP_KERNEL);
 	if (!page_list) {
+		put_pid(umem->pid);
 		kfree(umem);
 		return ERR_PTR(-ENOMEM);
 	}
-- 
1.9.1