From: Erick Archer <erick.archer@outlook.com>
To: "Miquel Raynal" <miquel.raynal@bootlin.com>,
"Richard Weinberger" <richard@nod.at>,
"Vignesh Raghavendra" <vigneshr@ti.com>,
"Tudor Ambarus" <tudor.ambarus@linaro.org>,
"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>,
"Kees Cook" <keescook@chromium.org>,
"Gustavo A. R. Silva" <gustavoars@kernel.org>
Cc: Erick Archer <erick.archer@outlook.com>,
linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org,
linux-hardening@vger.kernel.org
Subject: [PATCH] mtd: maps: sa1100-flash: Prefer struct_size over open coded arithmetic
Date: Sat, 30 Mar 2024 18:55:35 +0100 [thread overview]
Message-ID: <AS8PR02MB7237AC633B0D1D2EBD3C40E98B392@AS8PR02MB7237.eurprd02.prod.outlook.com> (raw)
This is an effort to get rid of all multiplications from allocation
functions in order to prevent integer overflows [1][2].
As the "info" variable is a pointer to "struct sa_info" and this
structure ends in a flexible array:
struct sa_info {
[...]
struct sa_subdev_info subdev[];
};
the preferred way in the kernel is to use the struct_size() helper to
do the arithmetic instead of the calculation "size + size * count" in
the kzalloc() function.
This way, the code is more readable and safer.
This code was detected with the help of Coccinelle, and audited and
modified manually.
Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments [1]
Link: https://github.com/KSPP/linux/issues/160 [2]
Signed-off-by: Erick Archer <erick.archer@outlook.com>
---
Hi,
The Coccinelle script used to detect this code pattern is the following:
virtual report
@rule1@
type t1;
type t2;
identifier i0;
identifier i1;
identifier i2;
identifier ALLOC =~ "kmalloc|kzalloc|kmalloc_node|kzalloc_node|vmalloc|vzalloc|kvmalloc|kvzalloc";
position p1;
@@
i0 = sizeof(t1) + sizeof(t2) * i1;
...
i2 = ALLOC@p1(..., i0, ...);
@script:python depends on report@
p1 << rule1.p1;
@@
msg = "WARNING: verify allocation on line %s" % (p1[0].line)
coccilib.report.print_report(p1[0],msg)
Regards,
Erick
---
drivers/mtd/maps/sa1100-flash.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/drivers/mtd/maps/sa1100-flash.c b/drivers/mtd/maps/sa1100-flash.c
index d4ce2376d33f..ac8a0a19a021 100644
--- a/drivers/mtd/maps/sa1100-flash.c
+++ b/drivers/mtd/maps/sa1100-flash.c
@@ -153,7 +153,7 @@ static struct sa_info *sa1100_setup_mtd(struct platform_device *pdev,
struct flash_platform_data *plat)
{
struct sa_info *info;
- int nr, size, i, ret = 0;
+ int nr, i, ret = 0;
/*
* Count number of devices.
@@ -167,12 +167,10 @@ static struct sa_info *sa1100_setup_mtd(struct platform_device *pdev,
goto out;
}
- size = sizeof(struct sa_info) + sizeof(struct sa_subdev_info) * nr;
-
/*
* Allocate the map_info structs in one go.
*/
- info = kzalloc(size, GFP_KERNEL);
+ info = kzalloc(struct_size(info, subdev, nr), GFP_KERNEL);
if (!info) {
ret = -ENOMEM;
goto out;
--
2.25.1
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next reply other threads:[~2024-03-30 17:56 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-30 17:55 Erick Archer [this message]
2024-04-09 6:40 ` [PATCH] mtd: maps: sa1100-flash: Prefer struct_size over open coded arithmetic Miquel Raynal
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