[PATCH] [v2] iommu/intel: Fix memleak in intel_irq_remapping_alloc

[Dinghao Liu]

When irq_domain_get_irq_data() or irqd_cfg() fails
at i == 0, data allocated by kzalloc() has not been
freed before returning, which leads to memleak.

Fixes: b106ee63abccb ("irq_remapping/vt-d: Enhance Intel IR driver to support 
hierarchical irqdomains")
Signed-off-by: Dinghao Liu <dinghao....@zju.edu.cn>
---

Changelog:

v2: - Add a check against i instead of setting data to NULL.
---
 drivers/iommu/intel/irq_remapping.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/iommu/intel/irq_remapping.c 
b/drivers/iommu/intel/irq_remapping.c
index aeffda92b10b..685200a5cff0 100644
--- a/drivers/iommu/intel/irq_remapping.c
+++ b/drivers/iommu/intel/irq_remapping.c
@@ -1353,6 +1353,8 @@ static int intel_irq_remapping_alloc(struct irq_domain 
*domain,
                irq_data = irq_domain_get_irq_data(domain, virq + i);
                irq_cfg = irqd_cfg(irq_data);
                if (!irq_data || !irq_cfg) {
+                       if (!i)
+                               kfree(data);
                        ret = -EINVAL;
                        goto out_free_data;
                }
-- 
2.17.1