linux-kernel - [PATCH v3 3/4] vsscanf(): do not skip spaces

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Date:   Sat, 10 Jun 2023 16:40:43 -0400
From:   Demi Marie Obenour <demi@...isiblethingslab.com>
To:     Hans de Goede <hdegoede@...hat.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
        Lee Jones <lee@...nel.org>, Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>
Cc:     Demi Marie Obenour <demi@...isiblethingslab.com>,
        linux-media@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org,
        Christoph Hellwig <hch@....de>
Subject: [PATCH v3 3/4] vsscanf(): do not skip spaces

Passing spaces before e.g. an integer is usually
not intended.  This was suggested by Christoph in
https://lore.kernel.org/lkml/ZIQrohcizoj4bZWx@infradead.org/.

Suggested-by: Christoph Hellwig <hch@....de>
Signed-off-by: Demi Marie Obenour <demi@...isiblethingslab.com>
---
 lib/vsprintf.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 9e53355c35b1d6260631868228ede1d178fe3325..665f6197f8313d653f67d7886b12c43942e058dd 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -3551,8 +3551,6 @@ int vsscanf(const char *buf, const char *fmt, va_list args)
 			char *s = (char *)va_arg(args, char *);
 			if (field_width == -1)
 				field_width = SHRT_MAX;
-			/* first, skip leading white space in buffer */
-			str = skip_spaces(str);
 
 			/* now copy until next white space */
 			while (*str && !isspace(*str) && field_width--)
@@ -3639,11 +3637,7 @@ int vsscanf(const char *buf, const char *fmt, va_list args)
 			return num;
 		}
 
-		/* have some sort of integer conversion.
-		 * first, skip white space in buffer.
-		 */
-		str = skip_spaces(str);
-
+		/* have some sort of integer conversion. */
 		digit = *str;
 		if (is_sign && digit == '-') {
 			if (field_width == 1)
-- 
Sincerely,
Demi Marie Obenour (she/her/hers)
Invisible Things Lab