Commit 3735459037114d31e5acd9894fad9aed104231a0 uptream
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@xxxxxxxxxxxxx>
Reviewed-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/87sfw5305m.ffs@tglx
---
Backport applies to 4.14.y up to 5.14.y series
---
drivers/pci/msi.c | 24 ++++++++++++------------
1 file changed, 12 insertions(+), 12 deletions(-)
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -396,18 +396,6 @@ static void free_msi_irqs(struct pci_dev
for (i = 0; i < entry->nvec_used; i++)
BUG_ON(irq_has_action(entry->irq + i));
- pci_msi_teardown_msi_irqs(dev);
-
- list_for_each_entry_safe(entry, tmp, msi_list, list) {
- if (entry->msi_attrib.is_msix) {
- if (list_is_last(&entry->list, msi_list))
- iounmap(entry->mask_base);
- }
-
- list_del(&entry->list);
- free_msi_entry(entry);
- }
-
if (dev->msi_irq_groups) {
sysfs_remove_groups(&dev->dev.kobj, dev->msi_irq_groups);
msi_attrs = dev->msi_irq_groups[0]->attrs;
@@ -423,6 +411,18 @@ static void free_msi_irqs(struct pci_dev
kfree(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) {
+ if (entry->msi_attrib.is_msix) {
+ if (list_is_last(&entry->list, msi_list))
+ iounmap(entry->mask_base);
+ }
+
+ list_del(&entry->list);
+ free_msi_entry(entry);
+ }
}
static void pci_intx_for_msi(struct pci_dev *dev, int enable)
