linux-kernel - [PATCH] kconfig: Fix checking return value of 'fwrite'

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Message-ID: <87lisype1v.fsf@faui43f.informatik.uni-erlangen.de>
Date:	Thu, 06 Oct 2011 13:14:36 +0200
From:	Reinhard Tartler <Reinhard.Tartler@...ormatik.uni-erlangen.de>
To:	linux-kbuild@...r.kernel.org
Cc:	Jean Sacren <sakiwit@...il.com>, Michal Marek <mmarek@...e.cz>,
	linux-kernel@...r.kernel.org,
	vamos-dev@...ts.informatik.uni-erlangen.de
Subject: [PATCH] kconfig: Fix checking return value of 'fwrite'

fwrite indicates '1' written member if a zero-length string is written.
---
 scripts/kconfig/lkc.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/scripts/kconfig/lkc.h b/scripts/kconfig/lkc.h
index b633bdb..727d265 100644
--- a/scripts/kconfig/lkc.h
+++ b/scripts/kconfig/lkc.h
@@ -90,7 +90,7 @@ struct conf_printer {
 /* confdata.c and expr.c */
 static inline void xfwrite(const void *str, size_t len, size_t count, FILE *out)
 {
-	if (fwrite(str, len, count, out) < count)
+	if (len > 0 && fwrite(str, len, count, out) < count)
 		fprintf(stderr, "\nError in writing or end of file.\n");
 }
 
-- 
1.7.0.4

-- 
Reinhard Tartler                     Department of Computer Science IV
Martensstr 1, 91058 Erlangen Germany, University of Erlangen-Nuremberg
            http://www4.informatik.uni-erlangen.de/~tartler
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