linux-kernel - [PATCH] scsi: ufs: ufshcd-pltfrm: check the return value of kstrdup()

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Message-ID: <tencent_D3914A6FFF832049CC70B9411CAD1492E108@qq.com>
Date:   Sun, 12 Dec 2021 02:14:16 +0800
From:   xkernel <xkernel.wang@...mail.com>
To:     jejb@...ux.ibm.com, martin.petersen@...cle.com
Cc:     alim.akhtar@...sung.com, avri.altman@....com,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        xkernel <xkernel.wang@...mail.com>
Subject: [PATCH] scsi: ufs: ufshcd-pltfrm: check the return value of kstrdup()

kstrdup() can return NULL if some internal memory errors happen, so it
is better to check the return value of it.

Signed-off-by: xkernel <xkernel.wang@...mail.com>
---
 drivers/scsi/ufs/ufshcd-pltfrm.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/ufs/ufshcd-pltfrm.c b/drivers/scsi/ufs/ufshcd-pltfrm.c
index 8859c13..32e7bd3 100644
--- a/drivers/scsi/ufs/ufshcd-pltfrm.c
+++ b/drivers/scsi/ufs/ufshcd-pltfrm.c
@@ -89,9 +89,15 @@ static int ufshcd_parse_clock_info(struct ufs_hba *hba)
 			goto out;
 		}
 
+		clki->name = kstrdup(name, GFP_KERNEL);
+		if (!clki->name) {
+			ret = -ENOMEM;
+			devm_kfree(dev, clki);
+			goto out;
+		}
+
 		clki->min_freq = clkfreq[i];
 		clki->max_freq = clkfreq[i+1];
-		clki->name = kstrdup(name, GFP_KERNEL);
 		if (!strcmp(name, "ref_clk"))
 			clki->keep_link_active = true;
 		dev_dbg(dev, "%s: min %u max %u name %s\n", "freq-table-hz",
@@ -127,6 +133,10 @@ static int ufshcd_populate_vreg(struct device *dev, const char *name,
 		return -ENOMEM;
 
 	vreg->name = kstrdup(name, GFP_KERNEL);
+	if (!vreg->name) {
+		devm_kfree(dev, vreg);
+		return -ENOMEM;
+	}
 
 	snprintf(prop_name, MAX_PROP_SIZE, "%s-max-microamp", name);
 	if (of_property_read_u32(np, prop_name, &vreg->max_uA)) {
--