From: Quentin Schulz <quentin.sch...@theobroma-systems.com> U-Boot proper automatically modifies boot_targets to swap the order in which MMC storage media are used for standard boot based on which MMC storage medium was used to load U-Boot proper. This is however only done if the user has not changed it manually, therefore a check between the default and current value is done.
This used to work fine until the migration to standard boot where boot_targets value size in the default environment went above the 32 characters that env_get_default function can return, thus resulting in a truncated variable. Therefore the check between default and current value would always fail. By using the newly added env_get_default_into function, a buffer of the appropriate size can be allocated on the stack to get the whole value of boot_targets in the default environment and thus fixing the check. Cc: Quentin Schulz <foss+ub...@0leil.net> Signed-off-by: Quentin Schulz <quentin.sch...@theobroma-systems.com> --- board/theobroma-systems/puma_rk3399/puma-rk3399.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/board/theobroma-systems/puma_rk3399/puma-rk3399.c b/board/theobroma-systems/puma_rk3399/puma-rk3399.c index 1b7a39b0474..df667fae5fc 100644 --- a/board/theobroma-systems/puma_rk3399/puma-rk3399.c +++ b/board/theobroma-systems/puma_rk3399/puma-rk3399.c @@ -54,7 +54,9 @@ static int setup_boottargets(void) { const char *boot_device = ofnode_read_chosen_string("u-boot,spl-boot-device"); - char *env_default, *env; + char env_default[sizeof(BOOT_TARGETS)]; + char *env; + int ret; if (!boot_device) { debug("%s: /chosen/u-boot,spl-boot-device not set\n", @@ -63,7 +65,10 @@ static int setup_boottargets(void) } debug("%s: booted from %s\n", __func__, boot_device); - env_default = env_get_default("boot_targets"); + ret = env_get_default_into("boot_targets", env_default, + sizeof(env_default)); + if (ret < 0) + env_default[0] = '\0'; env = env_get("boot_targets"); if (!env) { debug("%s: boot_targets does not exist\n", __func__); -- 2.41.0