linux-kernel - [PATCH] vfio/pds: Potential memory leak in pds_vfio_dirty

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Date: Tue, 23 Jan 2024 09:13:19 +0800
From: Cong Liu <liucong2@...inos.cn>
To: Brett Creeley <brett.creeley@....com>,
	Jason Gunthorpe <jgg@...pe.ca>,
	Yishai Hadas <yishaih@...dia.com>,
	Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>,
	Kevin Tian <kevin.tian@...el.com>,
	Alex Williamson <alex.williamson@...hat.com>
Cc: Cong Liu <liucong2@...inos.cn>,
	kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] vfio/pds: Potential memory leak in pds_vfio_dirty_enable()

the patch releases the region_info memory if the interval_tree_iter_first()
function fails.

Signed-off-by: Cong Liu <liucong2@...inos.cn>
---
 drivers/vfio/pci/pds/dirty.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/vfio/pci/pds/dirty.c b/drivers/vfio/pci/pds/dirty.c
index 8ddf4346fcd5..67919b5db127 100644
--- a/drivers/vfio/pci/pds/dirty.c
+++ b/drivers/vfio/pci/pds/dirty.c
@@ -291,8 +291,11 @@ static int pds_vfio_dirty_enable(struct pds_vfio_pci_device *pds_vfio,
 	len = num_ranges * sizeof(*region_info);
 
 	node = interval_tree_iter_first(ranges, 0, ULONG_MAX);
-	if (!node)
-		return -EINVAL;
+	if (!node) {
+		err = -EINVAL;
+		goto out_free_region_info;
+	}
+
 	for (int i = 0; i < num_ranges; i++) {
 		struct pds_lm_dirty_region_info *ri = &region_info[i];
 		u64 region_size = node->last - node->start + 1;
-- 
2.34.1