linux-kernel - [PATCH] PCI/PTM: Fix memory leak in pcie_ptm_create

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Message-Id: <20260111163650.33168-1-adiyenga@cisco.com>
Date: Sun, 11 Jan 2026 22:06:50 +0530
From: Aadityarangan Shridhar Iyengar <adiyenga@...co.com>
To: bhelgaas@...gle.com
Cc: linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Aadityarangan Shridhar Iyengar <adiyenga@...co.com>
Subject: [PATCH] PCI/PTM: Fix memory leak in pcie_ptm_create_debugfs() error path

In pcie_ptm_create_debugfs(), if devm_kasprintf() fails after successfully
allocating ptm_debugfs with kzalloc(), the function returns NULL without
freeing the allocated memory, resulting in a memory leak.

Fix this by adding kfree(ptm_debugfs) before returning NULL in the
devm_kasprintf() error path.

This leak is particularly problematic during memory pressure situations
where devm_kasprintf() is more likely to fail, potentially compounding
the memory exhaustion issue.

Fixes: 132833405e61 ("PCI: Add debugfs support for exposing PTM context")
Signed-off-by: Aadityarangan Shridhar Iyengar <adiyenga@...co.com>
---
 drivers/pci/pcie/ptm.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/pcie/ptm.c b/drivers/pci/pcie/ptm.c
index ed0f9691e7d1..09c0167048a3 100644
--- a/drivers/pci/pcie/ptm.c
+++ b/drivers/pci/pcie/ptm.c
@@ -542,8 +542,10 @@ struct pci_ptm_debugfs *pcie_ptm_create_debugfs(struct device *dev, void *pdata,
 		return NULL;
 
 	dirname = devm_kasprintf(dev, GFP_KERNEL, "pcie_ptm_%s", dev_name(dev));
-	if (!dirname)
+	if (!dirname) {
+		kfree(ptm_debugfs);
 		return NULL;
+	}
 
 	ptm_debugfs->debugfs = debugfs_create_dir(dirname, NULL);
 	ptm_debugfs->pdata = pdata;
-- 
2.35.6