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XEN uses irqdesc::irq_data_common::handler_data to store a per interrupt 

XEN data pointer which contains XEN specific information.

handler data is meant for interrupt handlers and not for storing irq chip
specific information as some devices require handler data to store internal
per interrupt information, e.g. pinctrl/GPIO chained interrupt handlers.

This obviously creates a conflict of interests and crashes the machine
because the XEN pointer is overwritten by the driver pointer.

As the XEN data is not handler specific it should be stored in
irqdesc::irq_data::chip_data instead.

A simple sed s/irq_[sg]et_handler_data/irq_[sg]et_chip_data/ cures that.

Cc: stable@vger.kernel.org
Reported-by: Roman Shaposhnik <roman@zededa.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Roman Shaposhnik <roman@zededa.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/87lfi2yckt.fsf@nanos.tec.linutronix.de
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Thomas Gleixner 2020-08-25 17:22:58 +02:00 committed by Juergen Gross
parent ee87e1557c
commit c330fb1ddc
1 changed files with 8 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/xen/events/events_base.c
View File

@ -156,7 +156,7 @@ int get_evtchn_to_irq(evtchn_port_t evtchn)
/* Get info for IRQ */
struct irq_info *info_for_irq(unsigned irq)
{
return irq_get_handler_data(irq);
return irq_get_chip_data(irq);
}
/* Constructors for packed IRQ information. */
@ -377,7 +377,7 @@ static void xen_irq_init(unsigned irq)
info->type = IRQT_UNBOUND;
info->refcnt = -1;
irq_set_handler_data(irq, info);
irq_set_chip_data(irq, info);
list_add_tail(&info->list, &xen_irq_list_head);
}
@ -426,14 +426,14 @@ static int __must_check xen_allocate_irq_gsi(unsigned gsi)
static void xen_free_irq(unsigned irq)
{
struct irq_info *info = irq_get_handler_data(irq);
struct irq_info *info = irq_get_chip_data(irq);
if (WARN_ON(!info))
return;
list_del(&info->list);
irq_set_handler_data(irq, NULL);
irq_set_chip_data(irq, NULL);
WARN_ON(info->refcnt > 0);
@ -603,7 +603,7 @@ EXPORT_SYMBOL_GPL(xen_irq_from_gsi);
static void __unbind_from_irq(unsigned int irq)
{
evtchn_port_t evtchn = evtchn_from_irq(irq);
struct irq_info *info = irq_get_handler_data(irq);
struct irq_info *info = irq_get_chip_data(irq);
if (info->refcnt > 0) {
info->refcnt--;
@ -1108,7 +1108,7 @@ int bind_ipi_to_irqhandler(enum ipi_vector ipi,
void unbind_from_irqhandler(unsigned int irq, void *dev_id)
{
struct irq_info *info = irq_get_handler_data(irq);
struct irq_info *info = irq_get_chip_data(irq);
if (WARN_ON(!info))
return;
@ -1142,7 +1142,7 @@ int evtchn_make_refcounted(evtchn_port_t evtchn)
if (irq == -1)
return -ENOENT;
info = irq_get_handler_data(irq);
info = irq_get_chip_data(irq);
if (!info)
return -ENOENT;
@ -1170,7 +1170,7 @@ int evtchn_get(evtchn_port_t evtchn)
if (irq == -1)
goto done;
info = irq_get_handler_data(irq);
info = irq_get_chip_data(irq);
if (!info)
goto done;