linux-kernel - [PATCH 4.4 056/112] lib: add "on"/"off" support to kstrtobool

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Date:   Wed, 26 Oct 2016 14:22:39 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Kees Cook <keescook@...omium.org>,
        Amitkumar Karwar <akarwar@...vell.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Joe Perches <joe@...ches.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nishant Sarmukadam <nishants@...vell.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Steve French <sfrench@...ba.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 4.4 056/112] lib: add "on"/"off" support to kstrtobool

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Kees Cook <keescook@...omium.org>

commit a81a5a17d44b26521fb1199f8ccf27f4af337a67 upstream.

Add support for "on" and "off" when converting to boolean.

Signed-off-by: Kees Cook <keescook@...omium.org>
Cc: Amitkumar Karwar <akarwar@...vell.com>
Cc: Andy Shevchenko <andy.shevchenko@...il.com>
Cc: Daniel Borkmann <daniel@...earbox.net>
Cc: Heiko Carstens <heiko.carstens@...ibm.com>
Cc: Joe Perches <joe@...ches.com>
Cc: Kalle Valo <kvalo@...eaurora.org>
Cc: Martin Schwidefsky <schwidefsky@...ibm.com>
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: Nishant Sarmukadam <nishants@...vell.com>
Cc: Rasmus Villemoes <linux@...musvillemoes.dk>
Cc: Steve French <sfrench@...ba.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 lib/kstrtox.c |   20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

--- a/lib/kstrtox.c
+++ b/lib/kstrtox.c
@@ -326,9 +326,9 @@ EXPORT_SYMBOL(kstrtos8);
  * @s: input string
  * @res: result
  *
- * This routine returns 0 iff the first character is one of 'Yy1Nn0'.
- * Otherwise it will return -EINVAL.  Value pointed to by res is
- * updated upon finding a match.
+ * This routine returns 0 iff the first character is one of 'Yy1Nn0', or
+ * [oO][NnFf] for "on" and "off". Otherwise it will return -EINVAL.  Value
+ * pointed to by res is updated upon finding a match.
  */
 int kstrtobool(const char *s, bool *res)
 {
@@ -346,6 +346,20 @@ int kstrtobool(const char *s, bool *res)
 	case '0':
 		*res = false;
 		return 0;
+	case 'o':
+	case 'O':
+		switch (s[1]) {
+		case 'n':
+		case 'N':
+			*res = true;
+			return 0;
+		case 'f':
+		case 'F':
+			*res = false;
+			return 0;
+		default:
+			break;
+		}
 	default:
 		break;
 	}