releases/6.12.24/ata-pata_pxa-fix-potential-null-pointer-dereference-.patch

From e9e28ebb2dbe7298a40d52a59b47479992a16bce Mon Sep 17 00:00:00 2001
From: Sasha Levin <sashal@kernel.org>
Date: Fri, 4 Apr 2025 14:14:38 +0800
Subject: ata: pata_pxa: Fix potential NULL pointer dereference in
 pxa_ata_probe()

From: Henry Martin <bsdhenrymartin@gmail.com>

[ Upstream commit ad320e408a8c95a282ab9c05cdf0c9b95e317985 ]

devm_ioremap() returns NULL on error. Currently, pxa_ata_probe() does
not check for this case, which can result in a NULL pointer dereference.

Add NULL check after devm_ioremap() to prevent this issue.

Fixes: 2dc6c6f15da9 ("[ARM] pata_pxa: DMA-capable PATA driver")
Signed-off-by: Henry Martin <bsdhenrymartin@gmail.com>
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/ata/pata_pxa.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/ata/pata_pxa.c b/drivers/ata/pata_pxa.c
index 538bd3423d859..1bdcd6ee741d3 100644
--- a/drivers/ata/pata_pxa.c
+++ b/drivers/ata/pata_pxa.c
@@ -223,10 +223,16 @@ static int pxa_ata_probe(struct platform_device *pdev)
 
 	ap->ioaddr.cmd_addr	= devm_ioremap(&pdev->dev, cmd_res->start,
 						resource_size(cmd_res));
+	if (!ap->ioaddr.cmd_addr)
+		return -ENOMEM;
 	ap->ioaddr.ctl_addr	= devm_ioremap(&pdev->dev, ctl_res->start,
 						resource_size(ctl_res));
+	if (!ap->ioaddr.ctl_addr)
+		return -ENOMEM;
 	ap->ioaddr.bmdma_addr	= devm_ioremap(&pdev->dev, dma_res->start,
 						resource_size(dma_res));
+	if (!ap->ioaddr.bmdma_addr)
+		return -ENOMEM;
 
 	/*
 	 * Adjust register offsets
-- 
2.39.5