This is a note to let you know that I've just added the patch titled
clk: microchip: fix potential UAF in auxdev release callback
to the 6.2-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:
clk-microchip-fix-potential-uaf-in-auxdev-release-callback.patch
and it can be found in the queue-6.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 7455b7007b9e93bcc2bc9c1c6c73a228e3152069 Mon Sep 17 00:00:00 2001
From: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>
Date: Thu, 13 Apr 2023 23:20:45 +0100
Subject: clk: microchip: fix potential UAF in auxdev release callback
From: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>
commit 7455b7007b9e93bcc2bc9c1c6c73a228e3152069 upstream.
Similar to commit 1c11289b34ab ("peci: cpu: Fix use-after-free in
adev_release()"), the auxiliary device is not torn down in the correct
order. If auxiliary_device_add() fails, the release callback will be
called twice, resulting in a UAF. Due to timing, the auxdev code in this
driver "took inspiration" from the aforementioned commit, and thus its
bugs too!
Moving auxiliary_device_uninit() to the unregister callback instead
avoids the issue.
CC: stable@xxxxxxxxxxxxxxx
Fixes: b56bae2dd6fd ("clk: microchip: mpfs: add reset controller")
Signed-off-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230413-critter-synopsis-dac070a86cb4@spud
Signed-off-by: Stephen Boyd <sboyd@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/clk/microchip/clk-mpfs.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
--- a/drivers/clk/microchip/clk-mpfs.c
+++ b/drivers/clk/microchip/clk-mpfs.c
@@ -374,14 +374,13 @@ static void mpfs_reset_unregister_adev(v
struct auxiliary_device *adev = _adev;
auxiliary_device_delete(adev);
+ auxiliary_device_uninit(adev);
}
static void mpfs_reset_adev_release(struct device *dev)
{
struct auxiliary_device *adev = to_auxiliary_dev(dev);
- auxiliary_device_uninit(adev);
-
kfree(adev);
}
Patches currently in stable-queue which might be from conor.dooley@xxxxxxxxxxxxx are
queue-6.2/riscv-mm-remove-redundant-parameter-of-create_fdt_early_page_table.patch
queue-6.2/mailbox-mpfs-switch-to-txdone_poll.patch
queue-6.2/risc-v-align-sbi-probe-implementation-with-spec.patch
queue-6.2/cacheinfo-check-sib_leaf-in-cache_leaves_are_shared.patch
queue-6.2/clk-microchip-fix-potential-uaf-in-auxdev-release-callback.patch
