linux-kernel - [PATCH] UBIFS: Fix integer overflow warnings

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Date:	Fri, 26 Jun 2009 17:10:50 -0700
From:	Kevin Cernekee <cernekee@...il.com>
To:	<dwmw2@...radead.org>, <dedekind@...radead.org>
Cc:	<linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] UBIFS: Fix integer overflow warnings

This warning was observed on MIPS32 using 2.6.31-rc1 and gcc-4.2.0:

fs/ubifs/io.c: In function 'ubifs_wbuf_init':
fs/ubifs/io.c:860: warning: integer overflow in expression
fs/ubifs/io.c:860: warning: integer overflow in expression
fs/ubifs/io.c:860: warning: integer overflow in expression

Signed-off-by: Kevin Cernekee <cernekee@...il.com>
---
index bc58571..184157e 100644
--- a/fs/ubifs/io.c
+++ b/fs/ubifs/io.c
@@ -857,7 +857,8 @@ int ubifs_wbuf_init(struct ubifs_info *c, struct ubifs_wbuf *wbuf)
 	 * and hard limits.
 	 */
 	hardlimit = ktime_set(DEFAULT_WBUF_TIMEOUT_SECS, 0);
-	wbuf->delta = (DEFAULT_WBUF_TIMEOUT_SECS * NSEC_PER_SEC) * 2 / 10;
+	wbuf->delta = ((unsigned long long)DEFAULT_WBUF_TIMEOUT_SECS *
+		       NSEC_PER_SEC) * 2 / 10;
 	wbuf->softlimit = ktime_sub_ns(hardlimit, wbuf->delta);
 	hrtimer_set_expires_range_ns(&wbuf->timer,  wbuf->softlimit,
 				     wbuf->delta);
--
--
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