linux-kernel - [PATCH] ata: pata_pxa: Add missing check for devm

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Message-Id: <20230209092814.10847-1-jiasheng@iscas.ac.cn>
Date:   Thu,  9 Feb 2023 17:28:14 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     s.shtylyov@....ru, damien.lemoal@...nsource.wdc.com
Cc:     linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH] ata: pata_pxa: Add missing check for devm_ioremap

Add the check for the return value of the devm_ioremap in order to avoid
NULL pointer dereference.

Fixes: 2dc6c6f15da9 ("[ARM] pata_pxa: DMA-capable PATA driver")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
 drivers/ata/pata_pxa.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/ata/pata_pxa.c b/drivers/ata/pata_pxa.c
index 985f42c4fd70..a20bb0824573 100644
--- a/drivers/ata/pata_pxa.c
+++ b/drivers/ata/pata_pxa.c
@@ -227,6 +227,8 @@ static int pxa_ata_probe(struct platform_device *pdev)
 						resource_size(ctl_res));
 	ap->ioaddr.bmdma_addr	= devm_ioremap(&pdev->dev, dma_res->start,
 						resource_size(dma_res));
+	if (!ap->ioaddr.cmd_addr || !ap->ioaddr.ctl_addr || !ap->ioaddr.bmdma_addr)
+		return -ENOMEM;
 
 	/*
 	 * Adjust register offsets
-- 
2.25.1