irqchip/gic-v3-its: Fix over allocation in itt_alloc_pool()

itt_alloc_pool() calls its_alloc_pages_node() to allocate an individual
page to add to the pool (for allocations <PAGE_SIZE). However the final
argument of its_alloc_pages_node() is the page order not the number of
pages. Currently it allocates two pages and leaks the second page.
Fix it by passing 0 instead (1 << 0 = 1 page).

Fixes: b08e2f42e86b ("irqchip/gic-v3-its: Share ITS tables with a non-trusted hypervisor")
Reported-by: Shanker Donthineni <sdonthineni@nvidia.com>
Signed-off-by: Steven Price <steven.price@arm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/1f6e19c4-1fb9-43ab-a8a2-a465c9cff84b@arm.com
Closes: https://lore.kernel.org/r/ed65312a-245c-4fa5-91ad-5d620cab7c6b%40nvidia.com

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index be77f927110dee8ff875ebbb7583fa77966253a1..395961fb21809b3d14436bb9c8d6869c03d51849 100644 (file)
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -261,7 +261,7 @@ static void *itt_alloc_pool(int node, int size)
                if (addr)
                        break;
 
-               page = its_alloc_pages_node(node, GFP_KERNEL | __GFP_ZERO, 1);
+               page = its_alloc_pages_node(node, GFP_KERNEL | __GFP_ZERO, 0);
                if (!page)
                        break;