linux-kernel - [PATCH] usb: storage: add error handling for kcalloc

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Message-Id: <1528707147-35623-1-git-send-email-jiazhouyang09@gmail.com>
Date:   Mon, 11 Jun 2018 16:52:26 +0800
From:   Zhouyang Jia <jiazhouyang09@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Zhouyang Jia <jiazhouyang09@...il.com>,
        Alan Stern <stern@...land.harvard.edu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, usb-storage@...ts.one-eyed-alien.net,
        linux-kernel@...r.kernel.org
Subject: [PATCH] usb: storage: add error handling for kcalloc

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@...il.com>
---
 drivers/usb/storage/alauda.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/usb/storage/alauda.c b/drivers/usb/storage/alauda.c
index 900591d..c56355c 100644
--- a/drivers/usb/storage/alauda.c
+++ b/drivers/usb/storage/alauda.c
@@ -437,6 +437,11 @@ 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)) {
+		pr_warn("alauda_init_media: memory allocation failed\n");
+		return USB_STOR_TRANSPORT_ERROR;
+	}
 
 	if (alauda_reset_media(us) != USB_STOR_XFER_GOOD)
 		return USB_STOR_TRANSPORT_ERROR;
-- 
2.7.4