[4.19,55/95] mmc: block: Fix use-after-free issue for rpmb
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Message ID 20200601174029.980447276@linuxfoundation.org
State New
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Series
  • Untitled series #446657
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Commit Message

Greg Kroah-Hartman June 1, 2020, 5:53 p.m. UTC
From: Peng Hao <richard.peng@oppo.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@oppo.com>
Cc: stable@vger.kernel.org
[Uffe: Fixed up mangled patch and updated commit message]
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/mmc/core/block.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch
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diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index 23bcdbba0cab..c723a1e54b18 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -2485,8 +2485,8 @@  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;
 }