linux-kernel - [PATCH 2/4] soc/fsl/qe: fix potential NULL pointer dereference in ucc_of_parse

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Date:   Wed, 21 Nov 2018 15:41:51 +0800
From:   Wen Yang <wen.yang99@....com.cn>
To:     qiang.zhao@....com
Cc:     leoyang.li@....com, linuxppc-dev@...ts.ozlabs.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        zhong.weidong@....com.cn, wang.yi59@....com.cn,
        wen.yang99@....com.cn, Julia Lawall <julia.lawall@...6.fr>
Subject: [PATCH 2/4] soc/fsl/qe: fix potential NULL pointer dereference in ucc_of_parse_tdm

This patch fixes a possible null pointer dereference in
ucc_of_parse_tdm, detected by the semantic patch
deref_null.cocci, with the following warning:

./drivers/soc/fsl/qe/qe_tdm.c:177:21-24: ERROR: pdev is NULL but dereferenced.

The following code has potential null pointer references:
        pdev = of_find_device_by_node(np2);
        if (!pdev) {
                ret = -EINVAL;
                pr_err("%pOFn: failed to lookup pdev\n", np2);
                of_node_put(np2);
                goto err_miss_siram_property;
        }
...
err_miss_siram_property:
        devm_iounmap(&pdev->dev, utdm->si_regs);

Signed-off-by: Wen Yang <wen.yang99@....com.cn>
Reviewed-by: Tan Hu <tan.hu@....com.cn>
CC: Julia Lawall <julia.lawall@...6.fr>
---
 drivers/soc/fsl/qe/qe_tdm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/soc/fsl/qe/qe_tdm.c b/drivers/soc/fsl/qe/qe_tdm.c
index f78c346..166378b 100644
--- a/drivers/soc/fsl/qe/qe_tdm.c
+++ b/drivers/soc/fsl/qe/qe_tdm.c
@@ -174,7 +174,8 @@ int ucc_of_parse_tdm(struct device_node *np, struct ucc_tdm *utdm,
 	return ret;
 
 err_miss_siram_property:
-	devm_iounmap(&pdev->dev, utdm->si_regs);
+	if (pdev)
+		devm_iounmap(&pdev->dev, utdm->si_regs);
 	return ret;
 }
 EXPORT_SYMBOL(ucc_of_parse_tdm);
-- 
2.9.5