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    Subject[PATCH 5.15 856/917] PCI/MSI: Destroy sysfs before freeing entries
    Date
    From: Thomas Gleixner <tglx@linutronix.de>

    commit 3735459037114d31e5acd9894fad9aed104231a0 upstream.

    free_msi_irqs() frees the MSI entries before destroying the sysfs entries
    which are exposing them. Nothing prevents a concurrent free while a sysfs
    file is read and accesses the possibly freed entry.

    Move the sysfs release ahead of freeing the entries.

    Fixes: 1c51b50c2995 ("PCI/MSI: Export MSI mode using attributes, not kobjects")
    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
    Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    Cc: Bjorn Helgaas <helgaas@kernel.org>
    Cc: stable@vger.kernel.org
    Link: https://lore.kernel.org/r/87sfw5305m.ffs@tglx
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/pci/msi.c | 10 +++++-----
    1 file changed, 5 insertions(+), 5 deletions(-)

    --- a/drivers/pci/msi.c
    +++ b/drivers/pci/msi.c
    @@ -368,6 +368,11 @@ static void free_msi_irqs(struct pci_dev
    for (i = 0; i < entry->nvec_used; i++)
    BUG_ON(irq_has_action(entry->irq + i));

    + if (dev->msi_irq_groups) {
    + msi_destroy_sysfs(&dev->dev, dev->msi_irq_groups);
    + dev->msi_irq_groups = NULL;
    + }
    +
    pci_msi_teardown_msi_irqs(dev);

    list_for_each_entry_safe(entry, tmp, msi_list, list) {
    @@ -379,11 +384,6 @@ static void free_msi_irqs(struct pci_dev
    list_del(&entry->list);
    free_msi_entry(entry);
    }
    -
    - if (dev->msi_irq_groups) {
    - msi_destroy_sysfs(&dev->dev, dev->msi_irq_groups);
    - dev->msi_irq_groups = NULL;
    - }
    }

    static void pci_intx_for_msi(struct pci_dev *dev, int enable)

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