linux-kernel - [PATCH] drivers: use IS_ERR_VALUE() in memory

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Message-Id: <1370452179-28230-1-git-send-email-linux@rasmusvillemoes.dk>
Date:	Wed,  5 Jun 2013 17:09:39 +0000
From:	Rasmus Villemoes <mail@...musvillemoes.dk>
To:	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org,
	Rasmus Villemoes <linux@...musvillemoes.dk>
Subject: [PATCH] drivers: use IS_ERR_VALUE() in memory_lseek()

Use IS_ERR_VALUE() instead of comparing the new offset to a hard-coded
value of -MAX_ERRNO (which is also off-by-one due to the use of ~
instead of -).

Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
---
 drivers/char/mem.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index 1ccbe94..2ca6d78 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -745,7 +745,7 @@ static loff_t memory_lseek(struct file *file, loff_t offset, int orig)
 		offset += file->f_pos;
 	case SEEK_SET:
 		/* to avoid userland mistaking f_pos=-9 as -EBADF=-9 */
-		if ((unsigned long long)offset >= ~0xFFFULL) {
+		if (IS_ERR_VALUE((unsigned long long)offset)) {
 			ret = -EOVERFLOW;
 			break;
 		}
-- 
1.7.9.5

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