clk: microchip: fix potential UAF in auxdev release callback

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commit 7455b7007b upstream.

Similar to commit 1c11289b34 ("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@vger.kernel.org
Fixes: b56bae2dd6 ("clk: microchip: mpfs: add reset controller")
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20230413-critter-synopsis-dac070a86cb4@spud
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Conor Dooley 2023-04-13 23:20:45 +01:00 • committed by Greg Kroah-Hartman

parent 39712c8aeb

commit 5b4052aa95

1 changed files with 1 additions and 2 deletions

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drivers/clk/microchip/clk-mpfs.c

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