linux-kernel - [PATCH] char: agp: intel-agp: check the return value of pci_find

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Message-Id: <20220225123100.25995-1-baijiaju1990@gmail.com>
Date:   Fri, 25 Feb 2022 04:31:00 -0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     airlied@...ux.ie
Cc:     linux-kernel@...r.kernel.org, Jia-Ju Bai <baijiaju1990@...il.com>
Subject: [PATCH] char: agp: intel-agp: check the return value of pci_find_capability()

The function pci_find_capability() in agp_intel_probe() can fail, so its
return value should be checked.

Reported-by: TOTE Robot <oslab@...nghua.edu.cn>
Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com>
---
 drivers/char/agp/intel-agp.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/char/agp/intel-agp.c b/drivers/char/agp/intel-agp.c
index 9e4f27a6cb5a..6a7e385bde8a 100644
--- a/drivers/char/agp/intel-agp.c
+++ b/drivers/char/agp/intel-agp.c
@@ -730,6 +730,8 @@ static int agp_intel_probe(struct pci_dev *pdev,
 	int i, err;
 
 	cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
+	if (!cap_ptr)
+		return -ENODEV;
 
 	bridge = agp_alloc_bridge();
 	if (!bridge)
-- 
2.17.1