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kconfig: remove string expansion in file_lookup()

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There are two callers of file_lookup(), but there is no more reason
to expand the given path.

[1] zconf_initscan()
    This is used to open the first Kconfig.  sym_expand_string_value()
    has never been used in a useful way here; before opening the first
    Kconfig file, obviously there is no symbol to expand.  If you use
    expand_string_value() instead, environments in KBUILD_KCONFIG would
    be expanded, but I do not see practical benefits for that.

[2] zconf_nextfile()
    This is used to open the next file from 'source' statement.
    Symbols in the path like "arch/$SRCARCH/Kconfig" needed expanding,
    but it was replaced with the direct environment expansion.  The
    environment has already been expanded before the token is passed
    to the parser.

By the way, file_lookup() was already buggy; it expanded a given path,
but it used the path before expansion for look-up:
        if (!strcmp(name, file->name)) {

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Ulf Magnusson <ulfalizer@gmail.com>
This commit is contained in:
Masahiro Yamada 2018-05-28 18:21:41 +09:00
parent 104daea149
commit bb222ceeb3
1 changed files with 1 additions and 3 deletions
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4
scripts/kconfig/util.c
View File

@ -14,18 +14,16 @@
struct file *file_lookup(const char *name)
{
struct file *file;
char *file_name = sym_expand_string_value(name);
for (file = file_list; file; file = file->next) {
if (!strcmp(name, file->name)) {
free(file_name);
return file;
}
}
file = xmalloc(sizeof(*file));
memset(file, 0, sizeof(*file));
file->name = file_name;
file->name = xstrdup(name);
file->next = file_list;
file_list = file;
return file;