linux-kernel - [PATCH] ACPI: NFIT: limit string attribute write

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Date:   Tue, 11 Jul 2023 10:22:44 +0100
From:   Ben Dooks <ben.dooks@...ethink.co.uk>
To:     nvdimm@...ts.linux.dev
Cc:     linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        lenb@...nel.org, Ben Dooks <ben.dooks@...ethink.co.uk>
Subject: [PATCH] ACPI: NFIT: limit string attribute write

If we're writing what could be an arbitrary sized string into an attribute
we should probably use sysfs_emit() just to be safe. Most of the other
attriubtes are some sort of integer so unlikely to be an issue so not
altered at this time.

Signed-off-by: Ben Dooks <ben.dooks@...ethink.co.uk>
---
v2:
  - use sysfs_emit() instead of snprintf.
---
 drivers/acpi/nfit/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index 9213b426b125..d7e9d9cd16d2 100644
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -1579,7 +1579,7 @@ static ssize_t id_show(struct device *dev,
 {
 	struct nfit_mem *nfit_mem = to_nfit_mem(dev);
 
-	return sprintf(buf, "%s\n", nfit_mem->id);
+	return snprintf(buf, PAGE_SIZE, "%s\n", nfit_mem->id);
 }
 static DEVICE_ATTR_RO(id);
 
-- 
2.40.1