linux-kernel - [PATCH V2 1/3] nvmem: u-boot-env: error if NVMEM device is too small

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Message-Id: <20240729080733.16839-1-zajec5@gmail.com>
Date: Mon, 29 Jul 2024 10:07:31 +0200
From: Rafał Miłecki <zajec5@...il.com>
To: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Michael Walle <michael@...le.cc>,
	Miquel Raynal <miquel.raynal@...tlin.com>,
	devicetree@...r.kernel.org,
	linux-mtd@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	u-boot@...ts.denx.de,
	linux-kernel@...r.kernel.org,
	John Thomson <git@...nthomson.fastmail.com.au>,
	Rafał Miłecki <rafal@...ecki.pl>
Subject: [PATCH V2 1/3] nvmem: u-boot-env: error if NVMEM device is too small

From: John Thomson <git@...nthomson.fastmail.com.au>

Verify data size before trying to parse it to avoid reading out of
buffer. This could happen in case of problems at MTD level or invalid DT
bindings.

Signed-off-by: John Thomson <git@...nthomson.fastmail.com.au>
Fixes: d5542923f200 ("nvmem: add driver handling U-Boot environment variables")
[rmilecki: simplify commit description & rebase]
Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
---
V2: New patch in the series

 drivers/nvmem/u-boot-env.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/nvmem/u-boot-env.c b/drivers/nvmem/u-boot-env.c
index 936e39b20b38..593f0bf4a395 100644
--- a/drivers/nvmem/u-boot-env.c
+++ b/drivers/nvmem/u-boot-env.c
@@ -176,6 +176,13 @@ static int u_boot_env_parse(struct u_boot_env *priv)
 		data_offset = offsetof(struct u_boot_env_image_broadcom, data);
 		break;
 	}
+
+	if (dev_size < data_offset) {
+		dev_err(dev, "Device too small for u-boot-env\n");
+		err = -EIO;
+		goto err_kfree;
+	}
+
 	crc32_addr = (__le32 *)(buf + crc32_offset);
 	crc32 = le32_to_cpu(*crc32_addr);
 	crc32_data_len = dev_size - crc32_data_offset;
-- 
2.35.3