[PATCH v2] usb: storage: add error handling for kcalloc

[Zhouyang Jia]

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@xxxxxxxxx>
---
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