linux-kernel - [PATCH] fix interaction of kasprintf() and vsnprintf() when using %pV

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Date:	Wed, 30 Mar 2011 16:56:20 +0100
From:	"Jan Beulich" <JBeulich@...ell.com>
To:	"Linus Torvalds" <torvalds@...ux-foundation.org>
Cc:	<stable@...nel.org>, <akpm@...ux-foundation.org>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH] fix interaction of kasprintf() and vsnprintf() when
	 using %pV

Otherwise, the warning at the top of vsnprintf() gets triggered by
kvasprintf()'s first invocation (with NULL buffer and zero size) of
vsnprintf().

Signed-off-by: Jan Beulich <jbeulich@...ell.com>

---
 lib/vsprintf.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 2.6.39-rc1/lib/vsprintf.c
+++ 2.6.39-rc1-kasprintf-no-warn/lib/vsprintf.c
@@ -898,7 +898,7 @@ char *pointer(const char *fmt, char *buf
 	case 'U':
 		return uuid_string(buf, end, ptr, spec, fmt);
 	case 'V':
-		return buf + vsnprintf(buf, end - buf,
+		return buf + vsnprintf(buf, end > buf ? end - buf : 0,
 				       ((struct va_format *)ptr)->fmt,
 				       *(((struct va_format *)ptr)->va));
 	case 'K':



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