kconfig: fix infinite loop when expanding a macro at the end of file
[ Upstream commitaf8bbce920
] 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:104daea149
("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>
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@ -301,8 +301,11 @@ static char *expand_token(const char *in, size_t n)
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new_string();
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append_string(in, n);
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/* get the whole line because we do not know the end of token. */
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while ((c = input()) != EOF) {
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/*
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* get the whole line because we do not know the end of token.
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* input() returns 0 (not EOF!) when it reachs the end of file.
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*/
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while ((c = input()) != 0) {
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if (c == '\n') {
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unput(c);
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break;
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