linux-kernel - [PATCH] crypto: hisilicon/qm - Fix device reference leak in qm_get_qos

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Message-Id: <20251027150934.60013-1-linmq006@gmail.com>
Date: Mon, 27 Oct 2025 23:09:34 +0800
From: Miaoqian Lin <linmq006@...il.com>
To: Weili Qian <qianweili@...wei.com>,
	Zhou Wang <wangzhou1@...ilicon.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	Kai Ye <yekai13@...wei.com>,
	linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: linmq006@...il.com,
	stable@...r.kernel.org
Subject: [PATCH] crypto: hisilicon/qm - Fix device reference leak in qm_get_qos_value

The qm_get_qos_value() function calls bus_find_device_by_name() which
increases the device reference count, but fails to call put_device()
to balance the reference count and lead to a device reference leak.

Add put_device() calls in both the error path and success path to
properly balance the reference count.

Found via static analysis.

Fixes: 22d7a6c39cab ("crypto: hisilicon/qm - add pci bdf number check")
Cc: stable@...r.kernel.org
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
 drivers/crypto/hisilicon/qm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/crypto/hisilicon/qm.c b/drivers/crypto/hisilicon/qm.c
index a5b96adf2d1e..3b391a146635 100644
--- a/drivers/crypto/hisilicon/qm.c
+++ b/drivers/crypto/hisilicon/qm.c
@@ -3871,10 +3871,12 @@ static ssize_t qm_get_qos_value(struct hisi_qm *qm, const char *buf,
 	pdev = container_of(dev, struct pci_dev, dev);
 	if (pci_physfn(pdev) != qm->pdev) {
 		pci_err(qm->pdev, "the pdev input does not match the pf!\n");
+		put_device(dev);
 		return -EINVAL;
 	}
 
 	*fun_index = pdev->devfn;
+	put_device(dev);
 
 	return 0;
 }
-- 
2.39.5 (Apple Git-154)