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common: env_ubi: Clear environment buffer before reading 

In case we have restarted u-boot there is a chance that environment
buffer contains old environment (from the previous boot). If UBI volume
is zero size, ubi_volume_read() doesn't modify the buffer and exits
successfully.

We need to clear buffer manually before reading it from UBI, so the
invalid CRC will cause setting default environment in case that the UBI
volume is zero size.

Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
This commit is contained in:
Marcin Niestroj 2016-05-24 14:59:55 +02:00 committed by Heiko Schocher
parent 6b3943f1b0
commit c1f51e0f3e
1 changed files with 21 additions and 0 deletions
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21
common/env_ubi.c
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@ -115,6 +115,17 @@ void env_relocate_spec(void)
int crc1_ok = 0, crc2_ok = 0;
env_t *ep, *tmp_env1, *tmp_env2;
/*
* In case we have restarted u-boot there is a chance that buffer
* contains old environment (from the previous boot).
* If UBI volume is zero size, ubi_volume_read() doesn't modify the
* buffer.
* We need to clear buffer manually here, so the invalid CRC will
* cause setting default environment as expected.
*/
memset(env1_buf, 0x0, CONFIG_ENV_SIZE);
memset(env2_buf, 0x0, CONFIG_ENV_SIZE);
tmp_env1 = (env_t *)env1_buf;
tmp_env2 = (env_t *)env2_buf;
@ -174,6 +185,16 @@ void env_relocate_spec(void)
{
ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
/*
* In case we have restarted u-boot there is a chance that buffer
* contains old environment (from the previous boot).
* If UBI volume is zero size, ubi_volume_read() doesn't modify the
* buffer.
* We need to clear buffer manually here, so the invalid CRC will
* cause setting default environment as expected.
*/
memset(buf, 0x0, CONFIG_ENV_SIZE);
if (ubi_part(CONFIG_ENV_UBI_PART, NULL)) {
printf("\n** Cannot find mtd partition \"%s\"\n",
CONFIG_ENV_UBI_PART);