linux-kernel - [PATCH] Bug in fs/afs/write.c function afs_write_back_from_locked

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Message-ID: <20070510115927.GB16409@srv1-m700-lanp.koti>
Date:	Thu, 10 May 2007 14:59:27 +0300
From:	Mika Kukkonen <mikukkon@...u.homelinux.net>
To:	dhowells@...hat.com
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] Bug in fs/afs/write.c function
	afs_write_back_from_locked_page()

Following bug was uncovered by compiling with '-W' flag:

  CC [M]  fs/afs/write.o
fs/afs/write.c: In function ‘afs_write_back_from_locked_page’:
fs/afs/write.c:398: warning: comparison of unsigned expression >= 0 is always true

Loop variable 'n' is unsigned, so wraps around happily as far as I can
see. Trival fix attached (compile tested only).

Signed-Off-By: Mika Kukkonen <mikukkon@....fi>

diff --git a/fs/afs/write.c b/fs/afs/write.c
index 83ff292..4bca263 100644
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -395,8 +395,9 @@ static int afs_write_back_from_locked_page(struct afs_writeback *wb,
 		if (n == 0)
 			goto no_more;
 		if (pages[0]->index != start) {
-			for (n--; n >= 0; n--)
+			for (n--; n > 0; n--)
 				put_page(pages[n]);
+			put_page(pages[0]);
 			goto no_more;
 		}

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