The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y git checkout FETCH_HEAD git cherry-pick -x 11a1f4bc47362700fcbde717292158873fb847ed # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2024072921-crazed-babble-80d9@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:

11a1f4bc4736 ("PCI/DPC: Fix use-after-free on concurrent DPC and hot-removal")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 11a1f4bc47362700fcbde717292158873fb847ed Mon Sep 17 00:00:00 2001 From: Lukas Wunner lukas@wunner.de Date: Tue, 18 Jun 2024 12:54:55 +0200 Subject: [PATCH] PCI/DPC: Fix use-after-free on concurrent DPC and hot-removal MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit

Keith reports a use-after-free when a DPC event occurs concurrently to hot-removal of the same portion of the hierarchy:

The dpc_handler() awaits readiness of the secondary bus below the Downstream Port where the DPC event occurred. To do so, it polls the config space of the first child device on the secondary bus. If that child device is concurrently removed, accesses to its struct pci_dev cause the kernel to oops.

That's because pci_bridge_wait_for_secondary_bus() neglects to hold a reference on the child device. Before v6.3, the function was only called on resume from system sleep or on runtime resume. Holding a reference wasn't necessary back then because the pciehp IRQ thread could never run concurrently. (On resume from system sleep, IRQs are not enabled until after the resume_noirq phase. And runtime resume is always awaited before a PCI device is removed.)

However starting with v6.3, pci_bridge_wait_for_secondary_bus() is also called on a DPC event. Commit 53b54ad074de ("PCI/DPC: Await readiness of secondary bus after reset"), which introduced that, failed to appreciate that pci_bridge_wait_for_secondary_bus() now needs to hold a reference on the child device because dpc_handler() and pciehp may indeed run concurrently. The commit was backported to v5.10+ stable kernels, so that's the oldest one affected.

Add the missing reference acquisition.

Abridged stack trace:

BUG: unable to handle page fault for address: 00000000091400c0 CPU: 15 PID: 2464 Comm: irq/53-pcie-dpc 6.9.0 RIP: pci_bus_read_config_dword+0x17/0x50 pci_dev_wait() pci_bridge_wait_for_secondary_bus() dpc_reset_link() pcie_do_recovery() dpc_handler()

Fixes: 53b54ad074de ("PCI/DPC: Await readiness of secondary bus after reset") Closes: https://lore.kernel.org/r/20240612181625.3604512-3-kbusch@meta.com/ Link: https://lore.kernel.org/linux-pci/8e4bcd4116fd94f592f2bf2749f168099c480ddf.1... Reported-by: Keith Busch kbusch@kernel.org Tested-by: Keith Busch kbusch@kernel.org Signed-off-by: Lukas Wunner lukas@wunner.de Signed-off-by: Krzysztof Wilczyński kwilczynski@kernel.org Reviewed-by: Keith Busch kbusch@kernel.org Reviewed-by: Mika Westerberg mika.westerberg@linux.intel.com Cc: stable@vger.kernel.org # v5.10+

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 59e0949fb079..c40a6c11e959 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -4753,7 +4753,7 @@ static int pci_bus_max_d3cold_delay(const struct pci_bus *bus) */ int pci_bridge_wait_for_secondary_bus(struct pci_dev *dev, char *reset_type) { - struct pci_dev *child; + struct pci_dev *child __free(pci_dev_put) = NULL; int delay;

if (pci_dev_is_disconnected(dev)) @@ -4782,8 +4782,8 @@ int pci_bridge_wait_for_secondary_bus(struct pci_dev *dev, char *reset_type) return 0; }

- child = list_first_entry(&dev->subordinate->devices, struct pci_dev, - bus_list); + child = pci_dev_get(list_first_entry(&dev->subordinate->devices, + struct pci_dev, bus_list)); up_read(&pci_bus_sem);

/*