kernel/linux.git/scripts/kconfig/conf.c, branch v6.1.186

kconfig: fix potential NULL pointer dereference in conf_askvalue

2026-07-24T13:54:33+00:00

[ Upstream commit b9d21c32dca2167a614e66c9e27999b9e1c33d55 ] In conf_askvalue(), the 'def' argument (retrieved via sym_get_string_value) can be NULL. While current call sites ensure that 'def' is valid, calling printf("%s\n", def) is technically undefined behavior and could lead to a segmentation fault on certain libc implementations if the function were called with a NULL pointer in the future. Improve the robustness of conf_askvalue() by providing an empty string as a fallback. Additionally, remove the redundant re-initialization of the 'line' buffer inside the !sym_is_changeable(sym) block, as it is already properly initialized at the function entry. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Xingjing Deng Reviewed-by: Nathan Chancellor Link: https://patch.msgid.link/20260306021709.27068-1-micro6947@gmail.com Signed-off-by: Nathan Chancellor Signed-off-by: Sasha Levin

kconfig: WERROR unmet symbol dependency

2025-02-21T12:49:24+00:00

[ Upstream commit 15d3f7664d2776c086f813f1efbfe2ae20a85e89 ] When KCONFIG_WERROR env variable is set treat unmet direct symbol dependency as a terminal condition (error). Suggested-by: Stefan Reinauer Signed-off-by: Sergey Senozhatsky Signed-off-by: Masahiro Yamada Stable-dep-of: a409fc1463d6 ("kconfig: fix memory leak in sym_warn_unmet_dep()") Signed-off-by: Sasha Levin

Kconfig: remove sym_set_choice_value

2022-09-28T19:40:15+00:00

sym_set_choice_value could be removed and directly call sym_set_tristate_value instead. Signed-off-by: Zeng Heng Suggested-by: Masahiro Yamada Signed-off-by: Masahiro Yamada

kconfig: Add `make mod2noconfig` to disable module options

2021-12-02T08:02:36+00:00

When converting a modular kernel to a monolithic kernel, once the kernel works without loading any modules, this helps to quickly disable all the modules before turning off module support entirely. Refactor conf_rewrite_mod_or_yes to a more general conf_rewrite_tristates that accepts an old and new state. Signed-off-by: Josh Triplett Tested-by: Björn Töpel Signed-off-by: Masahiro Yamada

kconfig: refactor listnewconfig code

2021-10-11T14:13:23+00:00

We can reuse __print_symbol() helper to print symbols for listnewconfig. Only the difference is the format for "n" symbols. This prints "CONFIG_FOO=n" instead of "# CONFIG_FOO is not set". Signed-off-by: Masahiro Yamada

kconfig: remove 'const' from the return type of sym_escape_string_value()

2021-10-01T08:28:17+00:00

sym_escape_string_value() returns a malloc'ed memory, but as (const char *). So, it must be casted to (void *) when it is free'd. This is odd. The return type of sym_escape_string_value() should be (char *). I exploited that free(NULL) has no effect. Signed-off-by: Masahiro Yamada

kconfig: constify long_opts

2021-06-05T14:49:46+00:00

getopt_long() does not modify the long_opts structure. Signed-off-by: Masahiro Yamada

kconfig: remove allnoconfig_y option

2021-04-14T06:22:49+00:00

Now that the only user, CONFIG_EMBEDDED has stopped using this option, remove it entirely. Signed-off-by: Masahiro Yamada

kconfig: move conf_set_all_new_symbols() to conf.c

2021-04-14T06:20:14+00:00

This function is only used in conf.c. Move it there together with the randomize_choice_values() helper. Define 'enum conf_def_mode' locally in conf.c as well. Signed-off-by: Masahiro Yamada

kconfig: move conf_rewrite_mod_or_yes() to conf.c

2021-03-25T04:35:29+00:00

This function is only used in conf.c. Signed-off-by: Masahiro Yamada