linux-kernel - [PATCH] nvdimm/pmem: Fix an error handling path in 'pmem_attach

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Date:   Sat,  6 Nov 2021 18:27:11 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     dan.j.williams@...el.com, vishal.l.verma@...el.com,
        dave.jiang@...el.com, ira.weiny@...el.com
Cc:     nvdimm@...ts.linux.dev, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH] nvdimm/pmem: Fix an error handling path in 'pmem_attach_disk()'

If 'devm_init_badblocks()' fails, a previous 'blk_alloc_disk()' call must
be undone.

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
This patch is speculative. Several fixes on error handling paths have been
done recently, but this one has been left as-is. There was maybe a good
reason that I have missed for that. So review with care!

I've not been able to identify a Fixes tag that please me :(
---
 drivers/nvdimm/pmem.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index fe7ece1534e1..c37a1e6750b3 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -490,8 +490,9 @@ static int pmem_attach_disk(struct device *dev,
 	nvdimm_namespace_disk_name(ndns, disk->disk_name);
 	set_capacity(disk, (pmem->size - pmem->pfn_pad - pmem->data_offset)
 			/ 512);
-	if (devm_init_badblocks(dev, &pmem->bb))
-		return -ENOMEM;
+	rc = devm_init_badblocks(dev, &pmem->bb);
+	if (rc)
+		goto out;
 	nvdimm_badblocks_populate(nd_region, &pmem->bb, &bb_range);
 	disk->bb = &pmem->bb;
 
-- 
2.30.2