This is a note to let you know that I've just added the patch titled
mmc: core: Prevent bus reference leak in mmc_blk_init()
to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mmc-core-prevent-bus-reference-leak-in-mmc_blk_init.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d0a0852b9f81cf5f793bf2eae7336ed40a1a1815 Mon Sep 17 00:00:00 2001
From: Alexander Kappner <agk@xxxxxxxxxxx>
Date: Wed, 28 Mar 2018 15:18:31 -0700
Subject: mmc: core: Prevent bus reference leak in mmc_blk_init()
From: Alexander Kappner <agk@xxxxxxxxxxx>
commit d0a0852b9f81cf5f793bf2eae7336ed40a1a1815 upstream.
Upon module load, mmc_block allocates a bus with bus_registeri() in
mmc_blk_init(). This reference never gets freed during module unload, which
leads to subsequent re-insertions of the module fails and a WARN() splat is
triggered.
Fix the bug by dropping the reference for the bus in mmc_blk_exit().
Signed-off-by: Alexander Kappner <agk@xxxxxxxxxxx>
Fixes: 97548575bef3 ("mmc: block: Convert RPMB to a character device")
Cc: <stable@xxxxxxxxxxxxxxx>
Reviewed-by: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Cc: Jisheng Zhang <Jisheng.Zhang@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/core/block.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -2904,6 +2904,7 @@ static void __exit mmc_blk_exit(void)
mmc_unregister_driver(&mmc_driver);
unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
unregister_chrdev_region(mmc_rpmb_devt, MAX_DEVICES);
+ bus_unregister(&mmc_rpmb_bus_type);
}
module_init(mmc_blk_init);
Patches currently in stable-queue which might be from agk@xxxxxxxxxxx are
queue-4.14/mmc-core-prevent-bus-reference-leak-in-mmc_blk_init.patch
