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

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Message-Id: <20230704081751.12170-1-ben.dooks@codethink.co.uk>
Date:   Tue,  4 Jul 2023 09:17:51 +0100
From:   Ben Dooks <ben.dooks@...ethink.co.uk>
To:     linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Cc:     nvdimm@...ts.linux.dev, 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 snprintf() 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>
---
 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