sh: intc: Fix use-after-free bug in register_intc_controller()

[ Upstream commit 63e72e5 ]

In the error handling for this function, d is freed without ever
removing it from intc_list which would lead to a use after free.
To fix this, let's only add it to the list after everything has
succeeded.

Fixes: 2dcec7a ("sh: intc: set_irq_wake() support")
Signed-off-by: Dan Carpenter <[email protected]>
Reviewed-by: John Paul Adrian Glaubitz <[email protected]>
Signed-off-by: John Paul Adrian Glaubitz <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>

CVE-2024-53165
(cherry picked from commit 6ba6e19912570b2ad68298be0be1dc779014a303 linux-6.11.y)
Signed-off-by: Bethany Jamison <[email protected]>
Acked-by: Stewart Hore <[email protected]>
Acked-by: Koichiro Den <[email protected]>
Signed-off-by: Koichiro Den <[email protected]>

Author: Dan Carpenter

drivers/sh/intc/core.c

@@ -209,7 +209,6 @@ int __init register_intc_controller(struct intc_desc *desc)
 		goto err0;
 
 	INIT_LIST_HEAD(&d->list);
-	list_add_tail(&d->list, &intc_list);
 
 	raw_spin_lock_init(&d->lock);
 	INIT_RADIX_TREE(&d->tree, GFP_ATOMIC);
@@ -369,6 +368,7 @@ int __init register_intc_controller(struct intc_desc *desc)
 
 	d->skip_suspend = desc->skip_syscore_suspend;
 
+	list_add_tail(&d->list, &intc_list);
 	nr_intc_controllers++;
 
 	return 0;