From: Michal Wilczynski <michal.wilczynski@intel.com>
To: nvdimm@lists.linux.dev, linux-acpi@vger.kernel.org,
dan.j.williams@intel.com
Cc: rafael@kernel.org, vishal.l.verma@intel.com, lenb@kernel.org,
dave.jiang@intel.com, ira.weiny@intel.com,
linux-kernel@vger.kernel.org,
Michal Wilczynski <michal.wilczynski@intel.com>,
Andy Shevchenko <andy.shevchenko@gmail.com>
Subject: [PATCH v2] ACPI: NFIT: Fix local use of devm_*()
Date: Fri, 13 Oct 2023 11:57:22 +0300 [thread overview]
Message-ID: <20231013085722.3031537-1-michal.wilczynski@intel.com> (raw)
devm_*() family of functions purpose is managing memory attached to a
device. So in general it should only be used for allocations that should
last for the whole lifecycle of the device. This is not the case for
acpi_nfit_init_interleave_set(). There are two allocations that are only
used locally in this function.
Fix this by switching from devm_kcalloc() to kcalloc(), and adding
modern scope based rollback. This is similar to C++ RAII and is
preferred way for handling local memory allocations.
Reported-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Suggested-by: Dave Jiang <dave.jiang@intel.com>
Suggested-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Michal Wilczynski <michal.wilczynski@intel.com>
---
v2:
- removed first commit from the patchset, as the commit couldn't
be marked as a fix
- squashed those commits together, since the second one were
mostly overwriting the previous one
drivers/acpi/nfit/core.c | 21 ++++++++-------------
1 file changed, 8 insertions(+), 13 deletions(-)
diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index 3826f49d481b..67a844a705c4 100644
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -2257,26 +2257,23 @@ static int acpi_nfit_init_interleave_set(struct acpi_nfit_desc *acpi_desc,
struct nd_region_desc *ndr_desc,
struct acpi_nfit_system_address *spa)
{
+ u16 nr = ndr_desc->num_mappings;
+ struct nfit_set_info2 *info2 __free(kfree) =
+ kcalloc(nr, sizeof(*info2), GFP_KERNEL);
+ struct nfit_set_info *info __free(kfree) =
+ kcalloc(nr, sizeof(*info), GFP_KERNEL);
struct device *dev = acpi_desc->dev;
struct nd_interleave_set *nd_set;
- u16 nr = ndr_desc->num_mappings;
- struct nfit_set_info2 *info2;
- struct nfit_set_info *info;
int i;
+ if (!info || !info2)
+ return -ENOMEM;
+
nd_set = devm_kzalloc(dev, sizeof(*nd_set), GFP_KERNEL);
if (!nd_set)
return -ENOMEM;
import_guid(&nd_set->type_guid, spa->range_guid);
- info = devm_kcalloc(dev, nr, sizeof(*info), GFP_KERNEL);
- if (!info)
- return -ENOMEM;
-
- info2 = devm_kcalloc(dev, nr, sizeof(*info2), GFP_KERNEL);
- if (!info2)
- return -ENOMEM;
-
for (i = 0; i < nr; i++) {
struct nd_mapping_desc *mapping = &ndr_desc->mapping[i];
struct nvdimm *nvdimm = mapping->nvdimm;
@@ -2337,8 +2334,6 @@ static int acpi_nfit_init_interleave_set(struct acpi_nfit_desc *acpi_desc,
}
ndr_desc->nd_set = nd_set;
- devm_kfree(dev, info);
- devm_kfree(dev, info2);
return 0;
}
--
2.41.0
next reply other threads:[~2023-10-13 8:57 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-13 8:57 Michal Wilczynski [this message]
2023-10-13 16:38 ` [PATCH v2] ACPI: NFIT: Fix local use of devm_*() Dan Williams
2023-10-13 17:00 ` Wilczynski, Michal
2023-10-13 17:05 ` Dan Williams
2023-10-13 17:18 ` Wilczynski, Michal
2023-10-13 21:20 ` Dan Williams
2023-10-14 10:17 ` Andy Shevchenko
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