[PATCH 5.10 081/103] iommu/intel: Fix memleak in intel_irq_remapping_alloc

[Greg Kroah-Hartman]

From: Dinghao Liu <dinghao....@zju.edu.cn>

commit ff2b46d7cff80d27d82f7f3252711f4ca1666129 upstream.

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: b106ee63abcc ("irq_remapping/vt-d: Enhance Intel IR driver to support 
hierarchical irqdomains")
Signed-off-by: Dinghao Liu <dinghao....@zju.edu.cn>
Acked-by: Lu Baolu <baolu...@linux.intel.com>
Link: https://lore.kernel.org/r/20210105051837.32118-1-dinghao....@zju.edu.cn
Signed-off-by: Will Deacon <w...@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/iommu/intel/irq_remapping.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/iommu/intel/irq_remapping.c
+++ b/drivers/iommu/intel/irq_remapping.c
@@ -1390,6 +1390,8 @@ static int intel_irq_remapping_alloc(str
                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;
                }