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kconfig: Clear "written" flag to avoid data loss 

Prior to this commit, starting nconfig, xconfig or gconfig, and saving
the .config file more than once caused data loss, where a .config file
that contained only comments would be written to disk starting from the
second save operation.

This bug manifests itself because the SYMBOL_WRITTEN flag is never
cleared after the first call to conf_write, and subsequent calls to
conf_write then skip all of the configuration symbols due to the
SYMBOL_WRITTEN flag being set.

This commit resolves this issue by clearing the SYMBOL_WRITTEN flag
from all symbols before conf_write returns.

Fixes: 8e2442a5f8 ("kconfig: fix missing choice values in auto.conf")
Cc: linux-stable <stable@vger.kernel.org> # 4.19+
Signed-off-by: M. Vefa Bicakci <m.v.b@runbox.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
alistair/sunxi64-5.4-dsi
M. Vefa Bicakci 2019-08-03 06:02:12 -04:00 committed by Masahiro Yamada
parent e8de12fb7c
commit 0c5b6c28ed
1 changed files with 4 additions and 0 deletions
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4
scripts/kconfig/confdata.c
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@ -848,6 +848,7 @@ int conf_write(const char *name)
const char *str;
char tmpname[PATH_MAX + 1], oldname[PATH_MAX + 1];
char *env;
int i;
bool need_newline = false;
if (!name)
@ -930,6 +931,9 @@ next:
}
fclose(out);
for_all_symbols(i, sym)
sym->flags &= ~SYMBOL_WRITTEN;
if (*tmpname) {
if (is_same(name, tmpname)) {
conf_message("No change to %s", name);