linux-kernel - [PATCH v5 01/10] crypto: hisilicon/qm - fix wrong release after using strsep

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Date:   Sat, 15 Aug 2020 17:56:08 +0800
From:   Yang Shen <shenyang39@...wei.com>
To:     <herbert@...dor.apana.org.au>, <davem@...emloft.net>
CC:     <linux-kernel@...r.kernel.org>, <linux-crypto@...r.kernel.org>,
        <xuzaibo@...wei.com>, <wangzhou1@...ilicon.com>
Subject: [PATCH v5 01/10] crypto: hisilicon/qm - fix wrong release after using strsep

From: Sihang Chen <chensihang1@...ilicon.com>

Save the string address before pass to strsep, release it at end.
Because strsep will update the string address to point after the
token.

Fixes: c31dc9fe165d("crypto: hisilicon/qm - add DebugFS for xQC and...")
Signed-off-by: Sihang Chen <chensihang1@...ilicon.com>
Signed-off-by: Yang Shen <shenyang39@...wei.com>
Reviewed-by: Zhou Wang <wangzhou1@...ilicon.com>
---
 drivers/crypto/hisilicon/qm.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/crypto/hisilicon/qm.c b/drivers/crypto/hisilicon/qm.c
index 6527c53..fb389c0 100644
--- a/drivers/crypto/hisilicon/qm.c
+++ b/drivers/crypto/hisilicon/qm.c
@@ -1420,17 +1420,18 @@ static int qm_dbg_help(struct hisi_qm *qm, char *s)
 static int qm_cmd_write_dump(struct hisi_qm *qm, const char *cmd_buf)
 {
 	struct device *dev = &qm->pdev->dev;
-	char *presult, *s;
+	char *presult, *s, *s_tmp;
 	int ret;
 
 	s = kstrdup(cmd_buf, GFP_KERNEL);
 	if (!s)
 		return -ENOMEM;
 
+	s_tmp = s;
 	presult = strsep(&s, " ");
 	if (!presult) {
-		kfree(s);
-		return -EINVAL;
+		ret = -EINVAL;
+		goto err_buffer_free;
 	}
 
 	if (!strcmp(presult, "sqc"))
@@ -1459,7 +1460,8 @@ static int qm_cmd_write_dump(struct hisi_qm *qm, const char *cmd_buf)
 	if (ret)
 		dev_info(dev, "Please echo help\n");
 
-	kfree(s);
+err_buffer_free:
+	kfree(s_tmp);
 
 	return ret;
 }
-- 
2.7.4