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A last minute fix for a regression introduced in the v6.5 merge window. The 

conversion of the software based interrupt resend mechanism to hlist missed
 to add a check whether the descriptor is already enqueued and dropped the
 interrupt descriptor lookup for nested interrupts.
 
 The missing check whether the descriptor is already queued causes hlist
 corruption and can be observed in the wild. The dropped parent descriptor
 lookup has not yet caused problems, but it would result in stale interrupt
 line in the worst case.
 
 Add the missing enqueued check and bring the descriptor lookup back to cure
 this.
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Merge tag 'irq-urgent-2023-08-26' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull irq fix from Thomas Gleixner:
 "A last minute fix for a regression introduced in the v6.5 merge
  window.

  The conversion of the software based interrupt resend mechanism to
  hlist missed to add a check whether the descriptor is already enqueued
  and dropped the interrupt descriptor lookup for nested interrupts.

  The missing check whether the descriptor is already queued causes
  hlist corruption and can be observed in the wild. The dropped parent
  descriptor lookup has not yet caused problems, but it would result in
  stale interrupt line in the worst case.

  Add the missing enqueued check and bring the descriptor lookup back to
  cure this"

* tag 'irq-urgent-2023-08-26' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  genirq: Fix software resend lockup and nested resend
This commit is contained in:
Linus Torvalds 2023-08-26 10:34:29 -07:00
parent c313761337 9f5deb5516
commit 3b35375f19
1 changed files with 6 additions and 1 deletions
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7
kernel/irq/resend.c
View File

@ -68,11 +68,16 @@ static int irq_sw_resend(struct irq_desc *desc)
*/
if (!desc->parent_irq)
return -EINVAL;
desc = irq_to_desc(desc->parent_irq);
if (!desc)
return -EINVAL;
}
/* Add to resend_list and activate the softirq: */
raw_spin_lock(&irq_resend_lock);
hlist_add_head(&desc->resend_node, &irq_resend_list);
if (hlist_unhashed(&desc->resend_node))
hlist_add_head(&desc->resend_node, &irq_resend_list);
raw_spin_unlock(&irq_resend_lock);
tasklet_schedule(&resend_tasklet);
return 0;