linux-kernel - [PATCH 5.6 110/177] mmc: block: Fix use-after-free issue for rpmb

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Date:   Mon,  1 Jun 2020 19:54:08 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Peng Hao <richard.peng@...o.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.6 110/177] mmc: block: Fix use-after-free issue for rpmb

From: Peng Hao <richard.peng@...o.com>

[ Upstream commit 202500d21654874aa03243e91f96de153ec61860 ]

The data structure member “rpmb->md” was passed to a call of the function
“mmc_blk_put” after a call of the function “put_device”. Reorder these
function calls to keep the data accesses consistent.

Fixes: 1c87f7357849 ("mmc: block: Fix bug when removing RPMB chardev ")
Signed-off-by: Peng Hao <richard.peng@...o.com>
Cc: stable@...r.kernel.org
[Uffe: Fixed up mangled patch and updated commit message]
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 32db16f6debc..2d19291ebc84 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -2475,8 +2475,8 @@ 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;
 }
-- 
2.25.1