genirq: Fix chained interrupt data ordering

commit 2c4569ca26986d18243f282dd727da27e9adae4c upstream.

irq_set_chained_handler_and_data() sets up the chained interrupt and then
stores the handler data.

That's racy against an immediate interrupt which gets handled before the
store of the handler data happened. The handler will dereference a NULL
pointer and crash.

Cure it by storing handler data before installing the chained handler.

Reported-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 1520645..e4453d9 100644 (file)
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -810,8 +810,8 @@ irq_set_chained_handler_and_data(unsigned int irq, irq_flow_handler_t handle,
        if (!desc)
                return;
 
-       __irq_do_set_handler(desc, handle, 1, NULL);
        desc->irq_common_data.handler_data = data;
+       __irq_do_set_handler(desc, handle, 1, NULL);
 
        irq_put_desc_busunlock(desc, flags);
 }