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irqchip/gic-v3-its: Lock VLPI map array before translating it 

Obtaining the mapping ivformation for a VLPI should always be
done with the vlpi_lock for this device held. Otherwise, we
expose ourselves to races against a concurrent unmap.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20191108165805.3071-11-maz@kernel.org
This commit is contained in:
Marc Zyngier 2019-11-08 16:58:04 +00:00
parent ed0e4aa9cc
commit 046b5054f5
1 changed files with 4 additions and 2 deletions
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6
drivers/irqchip/irq-gic-v3-its.c
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@ -1492,12 +1492,14 @@ out:
static int its_vlpi_get(struct irq_data *d, struct its_cmd_info *info)
{
struct its_device *its_dev = irq_data_get_irq_chip_data(d);
struct its_vlpi_map *map = get_vlpi_map(d);
struct its_vlpi_map *map;
int ret = 0;
mutex_lock(&its_dev->event_map.vlpi_lock);
if (!its_dev->event_map.vm || !map->vm) {
map = get_vlpi_map(d);
if (!its_dev->event_map.vm || !map) {
ret = -EINVAL;
goto out;
}