linux-kernel - [PATCH AUTOSEL 5.16 06/30] kconfig: add fflush() before ferror() check

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Date:   Wed,  6 Apr 2022 21:11:16 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        David Laight <David.Laight@...LAB.COM>,
        Sasha Levin <sashal@...nel.org>, linux-kbuild@...r.kernel.org
Subject: [PATCH AUTOSEL 5.16 06/30] kconfig: add fflush() before ferror() check

From: Masahiro Yamada <masahiroy@...nel.org>

[ Upstream commit 868653f421cd37e8ec3880da19f0aac93f5c46cc ]

As David Laight pointed out, there is not much point in calling
ferror() unless you call fflush() first.

Reported-by: David Laight <David.Laight@...LAB.COM>
Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 scripts/kconfig/confdata.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
index 027f4c28dc32..60545ed587fb 100644
--- a/scripts/kconfig/confdata.c
+++ b/scripts/kconfig/confdata.c
@@ -977,6 +977,7 @@ static int conf_write_autoconf_cmd(const char *autoconf_name)
 
 	fprintf(out, "\n$(deps_config): ;\n");
 
+	fflush(out);
 	ret = ferror(out); /* error check for all fprintf() calls */
 	fclose(out);
 	if (ret)
@@ -1095,6 +1096,7 @@ static int __conf_write_autoconf(const char *filename,
 		if ((sym->flags & SYMBOL_WRITE) && sym->name)
 			print_symbol(file, sym);
 
+	fflush(file);
 	/* check possible errors in conf_write_heading() and print_symbol() */
 	ret = ferror(file);
 	fclose(file);
-- 
2.35.1