linux-kernel - [PATCH] USB SL811HS HCD: Fix memory leak in sl811h_urb

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Date:	Sun, 23 Jan 2011 23:08:31 +0100 (CET)
From:	Jesper Juhl <jj@...osbits.net>
To:	linux-usb@...r.kernel.org
cc:	Greg Kroah-Hartman <gregkh@...e.de>,
	Mike Frysinger <vapier@...too.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Michael Hennerich <michael.hennerich@...log.com>,
	Kulikov Vasiliy <segooon@...il.com>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] USB SL811HS HCD: Fix memory leak in sl811h_urb_enqueue()

In drivers/usb/host/sl811-hcd.c::sl811h_urb_enqueue(), memory is allocated 
with kzalloc() and assigned to 'ep'. If we leave via the 'fail' label due 
to 'if (ep->maxpacket > H_MAXPACKET)', then 'ep' will go out of scope 
without having been assigned to anything, so we'll leak the memory we 
allocated.
This patch fixes the leak by simply calling kfree(ep); before jumping to 
the 'fail' label.

Signed-off-by: Jesper Juhl <jj@...osbits.net>
---
 sl811-hcd.c |    1 +
 1 file changed, 1 insertion(+)

  I don't have hardware to test this, so compile tested only.

diff --git a/drivers/usb/host/sl811-hcd.c b/drivers/usb/host/sl811-hcd.c
index 990f06b..2e9602a 100644
--- a/drivers/usb/host/sl811-hcd.c
+++ b/drivers/usb/host/sl811-hcd.c
@@ -861,6 +861,7 @@ static int sl811h_urb_enqueue(
 			DBG("dev %d ep%d maxpacket %d\n",
 				udev->devnum, epnum, ep->maxpacket);
 			retval = -EINVAL;
+			kfree(ep);
 			goto fail;
 		}
 

-- 
Jesper Juhl <jj@...osbits.net>            http://www.chaosbits.net/
Don't top-post http://www.catb.org/~esr/jargon/html/T/top-post.html
Plain text mails only, please.

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