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Subject[tip: irq/core] irqchip/gic-v3-its: Lock VLPI map array before translating it
The following commit has been merged into the irq/core branch of tip:

Commit-ID: 046b5054f56691c7f5861197a812f3990f66b30e
Gitweb: https://git.kernel.org/tip/046b5054f56691c7f5861197a812f3990f66b30e
Author: Marc Zyngier <maz@kernel.org>
AuthorDate: Fri, 08 Nov 2019 16:58:04
Committer: Marc Zyngier <maz@kernel.org>
CommitterDate: Sun, 10 Nov 2019 18:48:30

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
---
drivers/irqchip/irq-gic-v3-its.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 61b8851..9c4f35e 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -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;
}
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