linux-kernel - [PATCH v2] nvmem: u-boot-env: align endianness of crc32 values

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Message-Id: <20221012155133.287-1-musashino.open@gmail.com>
Date:   Thu, 13 Oct 2022 00:51:33 +0900
From:   INAGAKI Hiroshi <musashino.open@...il.com>
To:     rafal@...ecki.pl, srinivas.kandagatla@...aro.org
Cc:     linux-kernel@...r.kernel.org,
        INAGAKI Hiroshi <musashino.open@...il.com>
Subject: [PATCH v2] nvmem: u-boot-env: align endianness of crc32 values

This patch fixes crc32 error on Big-Endianness system by conversion of
calculated crc32 value.

Little-Endianness system:

  obtained crc32: Little
calculated crc32: Little

Big-Endianness system:

  obtained crc32: Little
calculated crc32: Big

log (APRESIA ApresiaLightGS120GT-SS, RTL8382M, Big-Endianness):

[    8.570000] u_boot_env 18001200.spi:flash@0:partitions:partition@...00: Invalid calculated CRC32: 0x88cd6f09 (expected: 0x096fcd88)
[    8.580000] u_boot_env: probe of 18001200.spi:flash@0:partitions:partition@...00 failed with error -22

Fixes: f955dc1445069 ("nvmem: add driver handling U-Boot environment variables")

Signed-off-by: INAGAKI Hiroshi <musashino.open@...il.com>
---
v1 -> v2

- add missing cast to __le32 for calculated crc32
  (reported by kernel test robot <lkp@...el.com>)

- add missing "Fixes:" tag

 drivers/nvmem/u-boot-env.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nvmem/u-boot-env.c b/drivers/nvmem/u-boot-env.c
index 8e72d1bbd649..b5aacf805fc6 100644
--- a/drivers/nvmem/u-boot-env.c
+++ b/drivers/nvmem/u-boot-env.c
@@ -143,7 +143,7 @@ static int u_boot_env_parse(struct u_boot_env *priv)
 	crc32_data_len = priv->mtd->size - crc32_data_offset;
 	data_len = priv->mtd->size - data_offset;
 
-	calc = crc32(~0, buf + crc32_data_offset, crc32_data_len) ^ ~0L;
+	calc = le32_to_cpu((__le32)crc32(~0, buf + crc32_data_offset, crc32_data_len) ^ ~0L);
 	if (calc != crc32) {
 		dev_err(dev, "Invalid calculated CRC32: 0x%08x (expected: 0x%08x)\n", calc, crc32);
 		err = -EINVAL;

base-commit: 60bbaad38109684b156e21112322e0a922f92cde
-- 
2.25.1