linux-kernel - [PATCH 08/10] scripts/basic/fixdep: Complete error handling in print

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Date:   Fri, 28 Oct 2016 10:39:11 +0200
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     linux-kbuild@...r.kernel.org, Michal Marek <mmarek@...e.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: [PATCH 08/10] scripts/basic/fixdep: Complete error handling in
 print_config()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Thu, 27 Oct 2016 22:45:03 +0200

Return values were not checked from calls of the function "printf"
and "putchar".

This issue was detected also by using the Coccinelle software.

* Add a bit of exception handling there.

* Optimise this function implementation a bit by replacing two output calls
  with the functions "fputs" and "puts".

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 scripts/basic/fixdep.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/scripts/basic/fixdep.c b/scripts/basic/fixdep.c
index 2c4ec91..f5ff6eea 100644
--- a/scripts/basic/fixdep.c
+++ b/scripts/basic/fixdep.c
@@ -142,16 +142,26 @@ static void print_config(const char *m, int slen)
 {
 	int c, i;
 
-	printf("    $(wildcard include/config/");
+	if (fputs("    $(wildcard include/config/", stdout) < 0)
+		goto put_failure;
 	for (i = 0; i < slen; i++) {
 		c = m[i];
 		if (c == '_')
 			c = '/';
 		else
 			c = tolower(c);
-		putchar(c);
+		if (putchar(c) == EOF)
+			goto put_failure;
+	}
+	if (puts(".h) \\") < 0) {
+put_failure:
+		{
+			int code = errno;
+
+			perror("fixdep: print_config");
+			exit(code);
+		}
 	}
-	printf(".h) \\\n");
 }
 
 static void do_extra_deps(void)
-- 
2.10.1