linux-kernel - [PATCH] PCI/AER: Fix NULL pointer access by aer

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Message-ID: <20250904182527.67371-1-vernon2gm@gmail.com>
Date: Fri,  5 Sep 2025 02:25:27 +0800
From: Vernon Yang <vernon2gm@...il.com>
To: mahesh@...ux.ibm.com,
	bhelgaas@...gle.com,
	oohall@...il.com
Cc: linuxppc-dev@...ts.ozlabs.org,
	linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Vernon Yang <yanglincheng@...inos.cn>
Subject: [PATCH] PCI/AER: Fix NULL pointer access by aer_info

From: Vernon Yang <yanglincheng@...inos.cn>

The kzalloc(GFP_KERNEL) may return NULL, so all accesses to
aer_info->xxx will result in kernel panic. Fix it.

Signed-off-by: Vernon Yang <yanglincheng@...inos.cn>
---
 drivers/pci/pcie/aer.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index e286c197d716..aeb2534f50dd 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -383,6 +383,10 @@ void pci_aer_init(struct pci_dev *dev)
 		return;
 
 	dev->aer_info = kzalloc(sizeof(*dev->aer_info), GFP_KERNEL);
+	if (!dev->aer_info) {
+		dev->aer_cap = 0;
+		return;
+	}
 
 	ratelimit_state_init(&dev->aer_info->correctable_ratelimit,
 			     DEFAULT_RATELIMIT_INTERVAL, DEFAULT_RATELIMIT_BURST);
-- 
2.51.0