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(163.6.106.80.static.otenet.gr [80.106.6.163]) by szelinsky.de (Postfix) with ESMTPSA; Thu, 13 Aug 2026 22:07:34 +0200 (CEST) From: Carlo Szelinsky To: Oleksij Rempel , Kory Maincent , Andrew Lunn , "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: Simon Horman , Jonas Jelonek , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Carlo Szelinsky Subject: [PATCH net v3 1/3] net: pse-pd: stop async event sources before freeing PI data in unregister Date: Thu, 13 Aug 2026 23:06:51 +0300 Message-ID: <20260813200653.980170-2-github@szelinsky.de> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260813200653.980170-1-github@szelinsky.de> References: <20260813200653.980170-1-github@szelinsky.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit pse_controller_unregister() frees resources that its own asynchronous event sources are still using: * The PI array (pcdev->pi) is freed by pse_release_pis() while the threaded IRQ handler pse_isr() can still be running. pse_isr() walks pcdev->pi[] (via pse_set_config_isr() and regulator_notifier_call_chain() on pcdev->pi[i].rdev), so an interrupt arriving before disable_irq() dereferences freed memory. * pse_flush_pw_ds() runs before disable_irq() and drops the power domain references, which can free pw_d->supply via __pse_pw_d_release(). A concurrent interrupt reaches that supply through _pse_pi_disable() -> pse_pw_d_retry_power_delivery() -> regulator_request_power_budget(pw_d->supply), another use-after-free. * cancel_work_sync(&pcdev->ntf_work) runs after pse_release_pis(), but the notification worker reaches pcdev->pi too: pse_send_ntf_worker() -> pse_control_put() -> __pse_control_release() dereferences psec->pcdev->pi[psec->id].admin_state_enabled. Draining the worker after the PI array is freed is therefore also a use-after-free. Reorder teardown so every asynchronous accessor is stopped first: disable the IRQ, drain the notification worker, and only then flush the power domains and release the PI array. Fixes: ffef61d6d273 ("net: pse-pd: Add support for budget evaluation strategies") Signed-off-by: Carlo Szelinsky Reviewed-by: Kory Maincent --- drivers/net/pse-pd/pse_core.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/net/pse-pd/pse_core.c b/drivers/net/pse-pd/pse_core.c index a5e6d7b26b9f..6045b6c399c2 100644 --- a/drivers/net/pse-pd/pse_core.c +++ b/drivers/net/pse-pd/pse_core.c @@ -1114,11 +1114,15 @@ EXPORT_SYMBOL_GPL(pse_controller_register); */ void pse_controller_unregister(struct pse_controller_dev *pcdev) { - pse_flush_pw_ds(pcdev); - pse_release_pis(pcdev); + /* Stop the IRQ and notification worker before freeing what they + * reach: both touch pcdev->pi, and the IRQ also uses pw_d->supply + * that pse_flush_pw_ds() drops. + */ if (pcdev->irq) disable_irq(pcdev->irq); cancel_work_sync(&pcdev->ntf_work); + pse_flush_pw_ds(pcdev); + pse_release_pis(pcdev); kfifo_free(&pcdev->ntf_fifo); mutex_lock(&pse_list_mutex); list_del(&pcdev->list); -- 2.43.0