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List:       linux-kernel
Subject:    [PATCH][V2] usb: isp1760: fix null dereference if kzalloc returns null
From:       Colin King <colin.king () canonical ! com>
Date:       2015-05-31 22:43:43
Message-ID: 1433112223-4651-1-git-send-email-colin.king () canonical ! com
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From: Colin Ian King <colin.king@canonical.com>

If kzalloc returns null then isp1760_ep_alloc_request performs
a null pointer dereference on req. Check for null to avoid this.

Detected with smatch static analysis:

drivers/usb/isp1760/isp1760-udc.c:816 isp1760_ep_alloc_request()
  error: potential null dereference 'req'.  (kzalloc returns null)

Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 drivers/usb/isp1760/isp1760-udc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/isp1760/isp1760-udc.c b/drivers/usb/isp1760/isp1760-udc.c
index 3fc4fe7..18ebf5b 100644
--- a/drivers/usb/isp1760/isp1760-udc.c
+++ b/drivers/usb/isp1760/isp1760-udc.c
@@ -812,6 +812,8 @@ static struct usb_request *isp1760_ep_alloc_request(struct usb_ep *ep,
 	struct isp1760_request *req;
 
 	req = kzalloc(sizeof(*req), gfp_flags);
+	if (!req)
+		return NULL;
 
 	return &req->req;
 }
-- 
2.1.4

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