linux-kernel - [PATCH 06/13] nvdimm/pmem: check the validity of the pointer pfn

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Message-ID: <153077337481.40830.15235657458024188710.stgit@dwillia2-desk3.amr.corp.intel.com>
Date:   Wed, 04 Jul 2018 23:49:34 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     akpm@...ux-foundation.org
Cc:     Huaisheng Ye <yehs1@...ovo.com>, Jan Kara <jack@...e.cz>,
        vishal.l.verma@...el.com, hch@....de, linux-nvdimm@...ts.01.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH 06/13] nvdimm/pmem: check the validity of the pointer pfn

From: Huaisheng Ye <yehs1@...ovo.com>

direct_access needs to check the validity of pointer pfn for NULL
assignment. If pfn equals to NULL, it doesn't need to calculate the value.

Signed-off-by: Huaisheng Ye <yehs1@...ovo.com>
Reviewed-by: Jan Kara <jack@...e.cz>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
---
 drivers/nvdimm/pmem.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index e8ac6f244d2b..c430536320a5 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -228,7 +228,8 @@ __weak long __pmem_direct_access(struct pmem_device *pmem, pgoff_t pgoff,
 					PFN_PHYS(nr_pages))))
 		return -EIO;
 	*kaddr = pmem->virt_addr + offset;
-	*pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags);
+	if (pfn)
+		*pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags);
 
 	/*
 	 * If badblocks are present, limit known good range to the