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| author | Jonas Gorski <jonas.gorski@gmail.com> | 2012-11-11 13:22:34 +0100 |
|---|---|---|
| committer | John Crispin <blogic@openwrt.org> | 2012-12-12 18:57:49 +0100 |
| commit | ce8f0d0607bcad3ec0e8599be80353204427093e (patch) | |
| tree | 9d5547b44b31086b498ac83045e3b3dc847836a2 /arch/mips/bcm63xx | |
| parent | MIPS: BCM47XX: remove GPIO driver (diff) | |
| download | linux-ce8f0d0607bcad3ec0e8599be80353204427093e.tar.xz linux-ce8f0d0607bcad3ec0e8599be80353204427093e.zip | |
MIPS: BCM63XX: fix nvram checksum calculation
The current checksum calculation code does nothing except checking that
the first byte of nvram is 0 without actually checking the checksum.
Implement the correct checksum calculation by calculating the crc32 with
the checksum field set to 0.
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
Patchwork: http://patchwork.linux-mips.org/patch/4540
Diffstat (limited to 'arch/mips/bcm63xx')
| -rw-r--r-- | arch/mips/bcm63xx/nvram.c | 23 |
1 files changed, 13 insertions, 10 deletions
diff --git a/arch/mips/bcm63xx/nvram.c b/arch/mips/bcm63xx/nvram.c index b57a10db7c98..620611680839 100644 --- a/arch/mips/bcm63xx/nvram.c +++ b/arch/mips/bcm63xx/nvram.c @@ -11,6 +11,7 @@ #define pr_fmt(fmt) "bcm63xx_nvram: " fmt #include <linux/init.h> +#include <linux/crc32.h> #include <linux/export.h> #include <linux/kernel.h> #include <linux/if_ether.h> @@ -40,23 +41,25 @@ static int mac_addr_used; int __init bcm63xx_nvram_init(void *addr) { unsigned int check_len; - u8 *p; - u32 val; + u32 crc, expected_crc; /* extract nvram data */ memcpy(&nvram, addr, sizeof(nvram)); /* check checksum before using data */ - if (nvram.version <= 4) - check_len = offsetof(struct bcm963xx_nvram, checksum_old); - else + if (nvram.version <= 4) { + check_len = offsetof(struct bcm963xx_nvram, reserved3); + expected_crc = nvram.checksum_old; + nvram.checksum_old = 0; + } else { check_len = sizeof(nvram); - val = 0; - p = (u8 *)&nvram; + expected_crc = nvram.checksum_high; + nvram.checksum_high = 0; + } + + crc = crc32_le(~0, (u8 *)&nvram, check_len); - while (check_len--) - val += *p; - if (val) + if (crc != expected_crc) return -EINVAL; return 0; |