linux-kernel - [PATCH 3.13.y-ckt 026/139] usb: renesas_usbhs: gadget: fix NULL pointer dereference in ep

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Date:	Wed, 28 Jan 2015 14:19:29 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Kazuya Mizuguchi <kazuya.mizuguchi.ks@...esas.com>,
	Takeshi Kihara <takeshi.kihara.df@...esas.com>,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
	Felipe Balbi <balbi@...com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13.y-ckt 026/139] usb: renesas_usbhs: gadget: fix NULL pointer dereference in ep_disable()

3.13.11-ckt15 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Kazuya Mizuguchi <kazuya.mizuguchi.ks@...esas.com>

commit 11432050f070810ba139d0226344eef120c3a559 upstream.

This patch fixes an issue that the NULL pointer dereference happens
when we uses g_audio driver. Since the g_audio driver will call
usb_ep_disable() in afunc_set_alt() before it calls usb_ep_enable(),
the uep->pipe of renesas usbhs driver will be NULL. So, this patch
adds a condition to avoid the oops.

Signed-off-by: Kazuya Mizuguchi <kazuya.mizuguchi.ks@...esas.com>
Signed-off-by: Takeshi Kihara <takeshi.kihara.df@...esas.com>
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Fixes: 2f98382dc (usb: renesas_usbhs: Add Renesas USBHS Gadget)
Signed-off-by: Felipe Balbi <balbi@...com>
[ kamal: backport to 3.13-stable ]
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/usb/renesas_usbhs/mod_gadget.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/usb/renesas_usbhs/mod_gadget.c b/drivers/usb/renesas_usbhs/mod_gadget.c
index 3385aeb..c3bb467 100644
--- a/drivers/usb/renesas_usbhs/mod_gadget.c
+++ b/drivers/usb/renesas_usbhs/mod_gadget.c
@@ -600,6 +600,10 @@ static int usbhsg_ep_enable(struct usb_ep *ep,
 static int usbhsg_ep_disable(struct usb_ep *ep)
 {
 	struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
+	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
+
+	if (!pipe)
+		return -EINVAL;
 
 	usbhsg_pipe_disable(uep);
 
-- 
1.9.1

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