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| author | Masahiro Yamada <masahiroy@kernel.org> | 2024-02-02 18:57:59 +0300 |
|---|---|---|
| committer | Sasha Levin <sashal@kernel.org> | 2024-03-27 01:17:29 +0300 |
| commit | 257b26293786443db541ee5b4044719dcdc2ba1b (patch) | |
| tree | 6262da5822d140f0747ee11469582f6d21f310f4 /scripts | |
| parent | 36f99de1d7cf94212133bfbb80c9dae55e14d8b3 (diff) | |
| download | linux-257b26293786443db541ee5b4044719dcdc2ba1b.tar.xz | |
kconfig: fix infinite loop when expanding a macro at the end of file
[ Upstream commit af8bbce92044dc58e4cc039ab94ee5d470a621f5 ]
A macro placed at the end of a file with no newline causes an infinite
loop.
[Test Kconfig]
$(info,hello)
\ No newline at end of file
I realized that flex-provided input() returns 0 instead of EOF when it
reaches the end of a file.
Fixes: 104daea149c4 ("kconfig: reference environment variables directly and remove 'option env='")
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'scripts')
| -rw-r--r-- | scripts/kconfig/lexer.l | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/scripts/kconfig/lexer.l b/scripts/kconfig/lexer.l index cc386e443683..2c2b3e6f248c 100644 --- a/scripts/kconfig/lexer.l +++ b/scripts/kconfig/lexer.l @@ -302,8 +302,11 @@ static char *expand_token(const char *in, size_t n) new_string(); append_string(in, n); - /* get the whole line because we do not know the end of token. */ - while ((c = input()) != EOF) { + /* + * get the whole line because we do not know the end of token. + * input() returns 0 (not EOF!) when it reachs the end of file. + */ + while ((c = input()) != 0) { if (c == '\n') { unput(c); break; |