linux-kernel - [PATCH v2] scsi: ufs: ufshcd-pltfrm: check the return value of devm

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Message-ID: <tencent_4257E15D4A94FF9020DDCC4BB9B21C041408@qq.com>
Date:   Sun, 16 Jan 2022 11:06:49 +0800
From:   xkernel.wang@...mail.com
To:     bvanassche@....org, 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,
        Xiaoke Wang <xkernel.wang@...mail.com>
Subject: [PATCH v2] scsi: ufs: ufshcd-pltfrm: check the return value of devm_kstrdup()

From: Xiaoke Wang <xkernel.wang@...mail.com>

devm_kstrdup() returns pointer to allocated string on success,
NULL on failure. So it is better to check the return value of it.

Signed-off-by: Xiaoke Wang <xkernel.wang@...mail.com>
---
Changelogs:
1. Use my official name.
2. Synchronize with the latest source code(kstrdup -> devm_kstrdup).
3. Clear up useless code(devm_kfree).
 drivers/scsi/ufs/ufshcd-pltfrm.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/scsi/ufs/ufshcd-pltfrm.c b/drivers/scsi/ufs/ufshcd-pltfrm.c
index d35b892..186540a 100644
--- a/drivers/scsi/ufs/ufshcd-pltfrm.c
+++ b/drivers/scsi/ufs/ufshcd-pltfrm.c
@@ -92,6 +92,11 @@ static int ufshcd_parse_clock_info(struct ufs_hba *hba)
 		clki->min_freq = clkfreq[i];
 		clki->max_freq = clkfreq[i+1];
 		clki->name = devm_kstrdup(dev, name, GFP_KERNEL);
+		if (!clki->name) {
+			ret = -ENOMEM;
+			goto out;
+		}
+
 		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 +132,8 @@ static int ufshcd_populate_vreg(struct device *dev, const char *name,
 		return -ENOMEM;
 
 	vreg->name = devm_kstrdup(dev, name, GFP_KERNEL);
+	if (!vreg->name)
+		return -ENOMEM;
 
 	snprintf(prop_name, MAX_PROP_SIZE, "%s-max-microamp", name);
 	if (of_property_read_u32(np, prop_name, &vreg->max_uA)) {
--