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>

diff --git a/common/env_ubi.c b/common/env_ubi.c
index e611199a58d6d30a69e72dc5c95fa39e9577dff8..0ac2f65f0b24be57a7b2c123d3ef7a1faa8f0c6e 100644 (file)
--- a/common/env_ubi.c
+++ b/common/env_ubi.c
@@ -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);