linux-kernel - [PATCH 2/8] staging: wfx: check memory allocation

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Message-Id: <20201009171307.864608-3-Jerome.Pouiller@silabs.com>
Date:   Fri,  9 Oct 2020 19:13:01 +0200
From:   Jerome Pouiller <Jerome.Pouiller@...abs.com>
To:     devel@...verdev.osuosl.org, linux-wireless@...r.kernel.org
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S . Miller" <davem@...emloft.net>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Jérôme Pouiller 
        <jerome.pouiller@...abs.com>
Subject: [PATCH 2/8] staging: wfx: check memory allocation

From: Jérôme Pouiller <jerome.pouiller@...abs.com>

Smatch complains:

   main.c:228 wfx_send_pdata_pds() warn: potential NULL parameter dereference 'tmp_buf'
   227          tmp_buf = kmemdup(pds->data, pds->size, GFP_KERNEL);
   228          ret = wfx_send_pds(wdev, tmp_buf, pds->size);
                                         ^^^^^^^
   229          kfree(tmp_buf);

Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Jérôme Pouiller <jerome.pouiller@...abs.com>
---
 drivers/staging/wfx/main.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/wfx/main.c b/drivers/staging/wfx/main.c
index df11c091e094..a8dc2c033410 100644
--- a/drivers/staging/wfx/main.c
+++ b/drivers/staging/wfx/main.c
@@ -222,12 +222,18 @@ static int wfx_send_pdata_pds(struct wfx_dev *wdev)
 	if (ret) {
 		dev_err(wdev->dev, "can't load PDS file %s\n",
 			wdev->pdata.file_pds);
-		return ret;
+		goto err1;
 	}
 	tmp_buf = kmemdup(pds->data, pds->size, GFP_KERNEL);
+	if (!tmp_buf) {
+		ret = -ENOMEM;
+		goto err2;
+	}
 	ret = wfx_send_pds(wdev, tmp_buf, pds->size);
 	kfree(tmp_buf);
+err2:
 	release_firmware(pds);
+err1:
 	return ret;
 }
 
-- 
2.28.0