linux-kernel - [PATCH] hugetlb: unsigned ret cannot be negative.

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Message-ID: <4931295B.7080105@gmail.com>
Date:	Sat, 29 Nov 2008 06:36:59 -0500
From:	roel kluin <roel.kluin@...il.com>
To:	wli@...omorphy.com
CC:	linux-kernel@...r.kernel.org
Subject: [PATCH] hugetlb: unsigned ret cannot be negative.

unsigned long ret cannot be negative, but ret can get -EFAULT.

Signed-off-by: Roel Kluin <roel.kluin@...il.com>
---
hugetlbfs_read_actor() returns int,
see 
vi fs/hugetlbfs/inode.c +187

diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 61edc70..0af64e4 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -252,6 +252,7 @@ static ssize_t hugetlbfs_read(struct file *filp, char __user *buf,
 	for (;;) {
 		struct page *page;
 		unsigned long nr, ret;
+		int ra;
 
 		/* nr is the maximum number of bytes to copy from this page */
 		nr = huge_page_size(h);
@@ -279,15 +280,16 @@ static ssize_t hugetlbfs_read(struct file *filp, char __user *buf,
 			/*
 			 * We have the page, copy it to user space buffer.
 			 */
-			ret = hugetlbfs_read_actor(page, offset, buf, len, nr);
+			ra = hugetlbfs_read_actor(page, offset, buf, len, nr);
 		}
-		if (ret < 0) {
+		if (ra < 0) {
 			if (retval == 0)
-				retval = ret;
+				retval = ra;
 			if (page)
 				page_cache_release(page);
 			goto out;
 		}
+		ret = ra;
 
 		offset += ret;
 		retval += ret;

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