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Message-Id: <1370274140-26420-9-git-send-email-jiang.liu@huawei.com> Date: Mon, 3 Jun 2013 23:42:20 +0800 From: Jiang Liu <liuj97@...il.com> To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Nitin Gupta <ngupta@...are.org>, Minchan Kim <minchan@...nel.org>, Jerome Marchand <jmarchan@...hat.com> Cc: Yijing Wang <wangyijing@...wei.com>, Jiang Liu <jiang.liu@...wei.com>, devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org Subject: [RFC PATCH v1 8/8] zram: protect sysfs handler from invalid memory access Use zram->init_lock to protect access to zram->meta, otherwise it may cause invalid memory access if zram->meta has been freed by __zram_reset_device(). Signed-off-by: Jiang Liu <jiang.liu@...wei.com> --- drivers/staging/zram/zram_sysfs.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/staging/zram/zram_sysfs.c b/drivers/staging/zram/zram_sysfs.c index 8cb7822..e239d94 100644 --- a/drivers/staging/zram/zram_sysfs.c +++ b/drivers/staging/zram/zram_sysfs.c @@ -179,8 +179,10 @@ static ssize_t mem_used_total_show(struct device *dev, struct zram *zram = dev_to_zram(dev); struct zram_meta *meta = zram->meta; + down_read(&zram->init_lock); if (zram->init_done) val = zs_get_total_size_bytes(meta->mem_pool); + up_read(&zram->init_lock); return sprintf(buf, "%llu\n", val); } -- 1.8.1.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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