linux-kernel - [PATCH 1/2] zram: avoid null access when fail to alloc meta

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Date:	Tue, 25 Feb 2014 10:08:35 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Nitin Gupta <ngupta@...are.org>,
	Jerome Marchand <jmarchan@...hat.com>,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	linux-kernel@...r.kernel.org, Minchan Kim <minchan@...nel.org>,
	<stable@...r.kernel.org>
Subject: [PATCH 1/2] zram: avoid null access when fail to alloc meta

zram_meta_alloc could be failed so caller should check it.
Otherwise, your system will be hang.

Cc: <stable@...r.kernel.org>
Signed-off-by: Minchan Kim <minchan@...nel.org>
---
 drivers/block/zram/zram_drv.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 5ec61be793d2..21aee3edcb25 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -554,6 +554,8 @@ static ssize_t disksize_store(struct device *dev,
 
 	disksize = PAGE_ALIGN(disksize);
 	meta = zram_meta_alloc(disksize);
+	if (!meta)
+		return -ENOMEM;
 	down_write(&zram->init_lock);
 	if (init_done(zram)) {
 		up_write(&zram->init_lock);
-- 
1.8.5.3

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