Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
kconfig: fix infinite loop when expanding a macro at the end of file
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>
+5
-2
+5
-2
scripts/kconfig/lexer.l
+5
-2
scripts/kconfig/lexer.l
···
303
303
new_string();
304
304
append_string(in, n);
305
305
306
-
/* get the whole line because we do not know the end of token. */
307
-
while ((c = input()) != EOF) {
306
+
/*
307
+
* get the whole line because we do not know the end of token.
308
+
* input() returns 0 (not EOF!) when it reachs the end of file.
309
+
*/
310
+
while ((c = input()) != 0) {
308
311
if (c == '\n') {
309
312
unput(c);
310
313
break;