diff options
| author | Conor Dooley <conor.dooley@microchip.com> | 2023-04-14 01:20:45 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-05-11 17:03:40 +0300 |
| commit | 5b4052aa956e11bcd19e50ca559eb38dcb46201b (patch) | |
| tree | 7c1092161a0bd5999359b757b04a82b84af824d7 /drivers/clk | |
| parent | 39712c8aeb79691bcec8bd6ff658cde1651e0803 (diff) | |
| download | linux-5b4052aa956e11bcd19e50ca559eb38dcb46201b.tar.xz | |
clk: microchip: fix potential UAF in auxdev release callback
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@vger.kernel.org
Fixes: b56bae2dd6fd ("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>
Diffstat (limited to 'drivers/clk')
| -rw-r--r-- | drivers/clk/microchip/clk-mpfs.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/clk/microchip/clk-mpfs.c b/drivers/clk/microchip/clk-mpfs.c index 4f0a19db7ed7..cc5d7dee59f0 100644 --- a/drivers/clk/microchip/clk-mpfs.c +++ b/drivers/clk/microchip/clk-mpfs.c @@ -374,14 +374,13 @@ static void mpfs_reset_unregister_adev(void *_adev) 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); } |