linux-kernel - [PATCH] mmc: fix use after free issue

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Message-ID: <HKAPR02MB429186300C2D9252A1D145BFE0B40@HKAPR02MB4291.apcprd02.prod.outlook.com>
Date:   Fri, 22 May 2020 07:23:34 +0000
From:   彭浩(Richard) <richard.peng@...o.com>
To:     "ulf.hansson@...aro.org" <ulf.hansson@...aro.org>,
        "chaotian.jing@...iatek.com" <chaotian.jing@...iatek.com>
CC:     "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] mmc: fix use after free issue

This is caused by dereferencing 'rpmb' after put_device().

Signed-off-by: Peng Hao <richard.peng@...o.com>
---
 drivers/mmc/core/block.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index 8499b56..e6e025c 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -2483,8 +2483,8 @@ static int mmc_rpmb_chrdev_release(struct inode *inode, struct file *filp)
 struct mmc_rpmb_data *rpmb = container_of(inode->i_cdev,
   struct mmc_rpmb_data, chrdev);

-put_device(&rpmb->dev);
 mmc_blk_put(rpmb->md);
+put_device(&rpmb->dev);

 return 0;
 }
--
2.7.4
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