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dm: fix alloc_dax error handling in alloc_dev

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[ Upstream commit d751939235b9b7bc4af15f90a3e99288a8b844a7 ]

Make sure ->dax_dev is NULL on error so that the cleanup path doesn't
trip over an ERR_PTR.

Reported-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20211129102203.2243509-2-hch@lst.de
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Christoph Hellwig 2021-11-29 11:21:35 +01:00 committed by Greg Kroah-Hartman
parent 78d56d0754
commit efd507bed1
1 changed files with 3 additions and 1 deletions
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4
drivers/md/dm.c
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@ -1794,8 +1794,10 @@ static struct mapped_device *alloc_dev(int minor)
if (IS_ENABLED(CONFIG_DAX_DRIVER)) {
md->dax_dev = alloc_dax(md, md->disk->disk_name,
&dm_dax_ops, 0);
if (IS_ERR(md->dax_dev))
if (IS_ERR(md->dax_dev)) {
md->dax_dev = NULL;
goto bad;
}
}
format_dev_t(md->name, MKDEV(_major, minor));