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From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
To: linux-sh@vger.kernel.org
Subject: [PATCH 1/4] usb: renesas_usbhs: gadget: fix NULL pointer dereference in ep_disable()
Date: Wed, 10 Sep 2014 10:33:40 +0000	[thread overview]
Message-ID: <54102904.6060703@renesas.com> (raw)

This patch fixes an issue that the NULL pointer dereference happens
when we use 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@renesas.com>
Signed-off-by: Takeshi Kihara <takeshi.kihara.df@renesas.com>
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.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 04e6505..a582222 100644
--- a/drivers/usb/renesas_usbhs/mod_gadget.c
+++ b/drivers/usb/renesas_usbhs/mod_gadget.c
@@ -602,6 +602,9 @@ 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 (!uep || !uep->pipe)
+		return -EINVAL;
+
 	usbhsg_pipe_disable(uep);
 	usbhs_pipe_free(pipe);

-- 
1.7.9.5


             reply	other threads:[~2014-09-10 10:33 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-09-10 10:33 Yoshihiro Shimoda [this message]
2014-09-10 13:49 ` [PATCH 1/4] usb: renesas_usbhs: gadget: fix NULL pointer dereference in ep_disable() Felipe Balbi
2014-09-10 23:56 ` Kuninori Morimoto
2014-09-11  0:18 ` Yoshihiro Shimoda
2014-09-11  0:23 ` Yoshihiro Shimoda

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