From: Conor Dooley conor.dooley@microchip.com
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 --- 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); }