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From:   Zhouyang Jia <jiazhouyang09@gmail.com>
Cc:     Zhouyang Jia <jiazhouyang09@gmail.com>,
        Alan Stern <stern@rowland.harvard.edu>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-usb@vger.kernel.org, usb-storage@lists.one-eyed-alien.net,
        linux-kernel@vger.kernel.org
Subject: [PATCH v2] usb: storage: add error handling for kcalloc
Date:   Thu, 14 Jun 2018 21:29:11 +0800
Message-Id: <1528982951-52753-1-git-send-email-jiazhouyang09@gmail.com>
In-Reply-To: <1528707147-35623-1-git-send-email-jiazhouyang09@gmail.com>
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When kcalloc fails, the lack of error-handling code may
cause unexpected results.

This patch adds error-handling code after calling kcalloc.

Signed-off-by: Zhouyang Jia <jiazhouyang09@gmail.com>
---
v1->v2:
- Remove pr_warn statement.
---
 drivers/usb/storage/alauda.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/storage/alauda.c b/drivers/usb/storage/alauda.c
index 900591d..4e17609 100644
--- a/drivers/usb/storage/alauda.c
+++ b/drivers/usb/storage/alauda.c
@@ -437,6 +437,9 @@ static int alauda_init_media(struct us_data *us)
 		+ MEDIA_INFO(us).blockshift + MEDIA_INFO(us).pageshift);
 	MEDIA_INFO(us).pba_to_lba = kcalloc(num_zones, sizeof(u16*), GFP_NOIO);
 	MEDIA_INFO(us).lba_to_pba = kcalloc(num_zones, sizeof(u16*), GFP_NOIO);
+	if ((MEDIA_INFO(us).pba_to_lba == NULL)
+		|| (MEDIA_INFO(us).lba_to_pba == NULL))
+		return USB_STOR_TRANSPORT_ERROR;
 
 	if (alauda_reset_media(us) != USB_STOR_XFER_GOOD)
 		return USB_STOR_TRANSPORT_ERROR;
-- 
2.7.4