linux-kernel - [PATCH] iommu/intel: Fix memleak in intel_irq_remapping

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Date:   Sat,  2 Jan 2021 17:50:29 +0800
From:   Dinghao Liu <dinghao.liu@....edu.cn>
To:     dinghao.liu@....edu.cn, kjlu@....edu
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Jiang Liu <jiang.liu@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: [PATCH] iommu/intel: Fix memleak in intel_irq_remapping_alloc

When irq_domain_get_irq_data() or irqd_cfg() fails
meanwhile 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.liu@....edu.cn>
---
 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..cdaeed36750f 100644
--- a/drivers/iommu/intel/irq_remapping.c
+++ b/drivers/iommu/intel/irq_remapping.c
@@ -1354,6 +1354,8 @@ static int intel_irq_remapping_alloc(struct irq_domain *domain,
 		irq_cfg = irqd_cfg(irq_data);
 		if (!irq_data || !irq_cfg) {
 			ret = -EINVAL;
+			kfree(data);
+			data = NULL;
 			goto out_free_data;
 		}
 
-- 
2.17.1