linux-kernel - [PATCH 3.4 032/176] usb: renesas_usbhs: gadget: fix NULL pointer dereference in ep

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Message-Id: <1428569224-23820-32-git-send-email-lizf@kernel.org>
Date:	Thu,  9 Apr 2015 16:44:40 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	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>, Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 032/176] usb: renesas_usbhs: gadget: fix NULL pointer dereference in ep_disable()

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

3.4.107-rc1 review patch.  If anyone has any objections, please let me know.

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


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>
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 drivers/usb/renesas_usbhs/mod_gadget.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/renesas_usbhs/mod_gadget.c b/drivers/usb/renesas_usbhs/mod_gadget.c
index 00bd2a5..056dc6e 100644
--- a/drivers/usb/renesas_usbhs/mod_gadget.c
+++ b/drivers/usb/renesas_usbhs/mod_gadget.c
@@ -672,6 +672,9 @@ static int __usbhsg_ep_set_halt_wedge(struct usb_ep *ep, int halt, int wedge)
 	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
 	unsigned long flags;
 
+	if (!pipe)
+		return -EINVAL;
+
 	usbhsg_pipe_disable(uep);
 
 	dev_dbg(dev, "set halt %d (pipe %d)\n",
-- 
1.9.1

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