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usb: renesas_usbhs: gadget: fix NULL pointer dereference in ep_disable()

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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@renesas.com>
Signed-off-by: Takeshi Kihara <takeshi.kihara.df@renesas.com>
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Fixes: 2f98382dc (usb: renesas_usbhs: Add Renesas USBHS Gadget)
Cc: <stable@vger.kernel.org> # v3.0+
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Kazuya Mizuguchi 2014-11-04 10:05:42 +09:00 committed by Felipe Balbi
parent c3761a79c1
commit 11432050f0
1 changed files with 3 additions and 0 deletions
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3
drivers/usb/renesas_usbhs/mod_gadget.c
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@ -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 (!pipe)
return -EINVAL;
usbhsg_pipe_disable(uep);
usbhs_pipe_free(pipe);