target/linux/generic/backport-5.15/807-v6.1-0011-nvmem-u-boot-env-fix-crc32_data_offset-on-redundant-.patch

   1 From ee424f7d3960152f5f862bbb6943e59828dc7917 Mon Sep 17 00:00:00 2001
   2 From: Christian Lamparter <chunkeey@gmail.com>
   3 Date: Fri, 4 Nov 2022 17:52:03 +0100
   4 Subject: [PATCH] nvmem: u-boot-env: fix crc32_data_offset on redundant
   5  u-boot-env
   6
   7 The Western Digital MyBook Live (PowerPC 464/APM82181)
   8 has a set of redundant u-boot-env. Loading up the driver
   9 the following error:
  10
  11 | u_boot_env: Invalid calculated CRC32: 0x4f8f2c86 (expected: 0x98b14514)
  12 | u_boot_env: probe of partition@1e000 failed with error -22
  13
  14 Looking up the userspace libubootenv utilities source [0],
  15 it looks like the "mark" or "flag" is not part of the
  16 crc32 sum... which is unfortunate :(
  17
  18 |static int libuboot_load(struct uboot_ctx *ctx)
  19 |{
  20 |[...]
  21 |       if (ctx->redundant) {
  22 |               [...]
  23 |               offsetdata = offsetof(struct uboot_env_redund, data);
  24 |               [...]                                   //-----^^
  25 |       }
  26 |       usable_envsize = ctx->size - offsetdata;
  27 |       buf[0] = malloc(bufsize);
  28 |[...]
  29 |       for (i = 0; i < copies; i++) {
  30 |               data = (uint8_t *)(buf[i] + offsetdata);
  31 |               uint32_t crc;
  32 |
  33 |               ret = devread(ctx, i, buf[i]);
  34 |               [...]
  35 |               crc = *(uint32_t *)(buf[i] + offsetcrc);
  36 |               dev->crc = crc32(0, (uint8_t *)data, usable_envsize);
  37 |
  38
  39 [0] https://github.com/sbabic/libubootenv/blob/master/src/uboot_env.c#L951
  40
  41 Fixes: d5542923f200 ("nvmem: add driver handling U-Boot environment variables")
  42 Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
  43 Link: https://lore.kernel.org/r/70a16eae113e08db2390b76e174f4837caa135c3.1667580636.git.chunkeey@gmail.com
  44 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  45 ---
  46  drivers/nvmem/u-boot-env.c | 2 +-
  47  1 file changed, 1 insertion(+), 1 deletion(-)
  48
  49 --- a/drivers/nvmem/u-boot-env.c
  50 +++ b/drivers/nvmem/u-boot-env.c
  51 @@ -135,7 +135,7 @@ static int u_boot_env_parse(struct u_boo
  52                 break;
  53         case U_BOOT_FORMAT_REDUNDANT:
  54                 crc32_offset = offsetof(struct u_boot_env_image_redundant, crc32);
  55 -               crc32_data_offset = offsetof(struct u_boot_env_image_redundant, mark);
  56 +               crc32_data_offset = offsetof(struct u_boot_env_image_redundant, data);
  57                 data_offset = offsetof(struct u_boot_env_image_redundant, data);
  58                 break;
  59         }