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| author | Masahiro Yamada <masahiroy@kernel.org> | 2024-02-03 00:57:59 +0900 |
|---|---|---|
| committer | Sasha Levin <sashal@kernel.org> | 2024-03-26 18:21:34 -0400 |
| commit | 04dd61330fe8b56988be9c465082f9877fccb452 (patch) | |
| tree | 252885af4befd4f90c94f4c5d5dd4964c4623932 | |
| parent | 3019ad4a028214cb4ef4fd8ac76d5f6be497b387 (diff) | |
| download | linux-04dd61330fe8b56988be9c465082f9877fccb452.tar.gz linux-04dd61330fe8b56988be9c465082f9877fccb452.tar.bz2 linux-04dd61330fe8b56988be9c465082f9877fccb452.zip | |
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>
| -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 312cbad2d34d..2a76393d52b5 100644 --- a/scripts/kconfig/lexer.l +++ b/scripts/kconfig/lexer.l @@ -301,8 +301,11 @@ 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; |