linux-kernel - [PATCH 1/1] ramfs/nommu: fix bug - kernel crash when (nr != lpages)

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Date:	Thu,  8 Jan 2009 00:30:23 +0800
From:	Bryan Wu <cooloney@...nel.org>
To:	dhowells@...hat.com
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	Graf Yang <graf.yang@...log.com>,
	Bryan Wu <cooloney@...nel.org>
Subject: [PATCH 1/1] ramfs/nommu: fix bug - kernel crash when (nr != lpages)

From: Graf Yang <graf.yang@...log.com>

Avoiding kernel crash when (nr != lpages), and return -ENOMEM,
let the user space application handle this error.

Signed-off-by: Graf Yang <graf.yang@...log.com>
Signed-off-by: Bryan Wu <cooloney@...nel.org>
---
 fs/ramfs/file-nommu.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/fs/ramfs/file-nommu.c b/fs/ramfs/file-nommu.c
index 76acdbc..9311031 100644
--- a/fs/ramfs/file-nommu.c
+++ b/fs/ramfs/file-nommu.c
@@ -283,7 +283,8 @@ unsigned long ramfs_nommu_get_unmapped_area(struct file *file,
 	if (pages) {
 		ptr = pages;
 		for (loop = lpages; loop > 0; loop--)
-			put_page(*ptr++);
+			if (*ptr)
+				put_page(*ptr++);
 		kfree(pages);
 	}
 
-- 
1.5.6

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