kernel/linux.git/scripts/kconfig/conf.c, branch v5.15.219

kconfig: fix potential NULL pointer dereference in conf_askvalue

2026-07-24T13:51:28+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

2025-03-13T11:50:14+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: 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

kconfig: remove assignment for Kconfig file

2021-03-25T04:35:20+00:00

Pass av[optind] to conf_parse() directly. Signed-off-by: Masahiro Yamada

kconfig: add help messages for --help (-h) and --silent (-s)

2021-03-25T04:35:12+00:00

Add missing options and make the help message more readable. Signed-off-by: Masahiro Yamada

kconfig: add long options --help and --silent

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

They are long options for -h and -s, respectively. Signed-off-by: Masahiro Yamada

kconfig: refactor option parse code

2021-03-25T04:34:37+00:00

The current option parse code is clumsy. The 's' option is separately handled in an if-conditional due to the following code: input_mode = (enum input_mode)opt; If 's' is moved to the switch statement, the invalid value 's' would be assigned to the input_mode. Another potential problem is that we are mixing 'enum input_mode' and ASCII characters. They could overwrap if we add more input modes. To separate them out, set the flag field of long options to a pointer of input_mode_opt. For mode select options, getopt_long() returns 0, which never causes overwrap with ASCII characters that represent short options. Signed-off-by: Masahiro Yamada