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66 lines
1.8 KiB
66 lines
1.8 KiB
From 7180de9a27ce433efc15bc1982b9a9e4ba3c48dc Mon Sep 17 00:00:00 2001
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From: Jonas Gorski <jonas.gorski@gmail.com>
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Date: Sat, 10 Nov 2012 02:04:58 +0100
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Subject: [PATCH] MIPS: BCM63XX: fix nvram checksum calculation
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The current checksum calculation code does nothing except checking that
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the first byte of nvram is 0 without actually checking the checksum.
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Implement the correct checksum calculation by calculating the crc32 with
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the checksum field set to 0.
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Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
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---
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This patch depends on the previous nvram patch ("move nvram functions
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into their own file").
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arch/mips/bcm63xx/nvram.c | 23 +++++++++++++----------
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1 files changed, 13 insertions(+), 10 deletions(-)
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--- a/arch/mips/bcm63xx/nvram.c
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+++ b/arch/mips/bcm63xx/nvram.c
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@@ -11,6 +11,7 @@
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#define pr_fmt(fmt) "bcm63xx_nvram: " fmt
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#include <linux/init.h>
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+#include <linux/crc32.h>
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#include <linux/export.h>
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#include <linux/kernel.h>
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#include <linux/if_ether.h>
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@@ -40,23 +41,25 @@ static int mac_addr_used;
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int __init bcm63xx_nvram_init(void *addr)
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{
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unsigned int check_len;
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- u8 *p;
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- u32 val;
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+ u32 crc, expected_crc;
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/* extract nvram data */
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memcpy(&nvram, addr, sizeof(nvram));
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/* check checksum before using data */
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- if (nvram.version <= 4)
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- check_len = offsetof(struct bcm963xx_nvram, checksum_old);
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- else
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+ if (nvram.version <= 4) {
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+ check_len = offsetof(struct bcm963xx_nvram, reserved3);
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+ expected_crc = nvram.checksum_old;
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+ nvram.checksum_old = 0;
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+ } else {
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check_len = sizeof(nvram);
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- val = 0;
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- p = (u8 *)&nvram;
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+ expected_crc = nvram.checksum_high;
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+ nvram.checksum_high = 0;
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+ }
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- while (check_len--)
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- val += *p;
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- if (val)
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+ crc = crc32_le(~0, (u8 *)&nvram, check_len);
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+
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+ if (crc != expected_crc)
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return -EINVAL;
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return 0;
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