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authorKazuya Mizuguchi <kazuya.mizuguchi.ks@renesas.com>2014-11-04 10:05:42 +0900
committerFelipe Balbi <balbi@ti.com>2014-11-05 13:22:05 -0600
commit11432050f070810ba139d0226344eef120c3a559 (patch)
tree2b38118660d3f7fbadeab5342f4550e962ec81fd /drivers/usb/renesas_usbhs/mod_gadget.c
parentc3761a79c14da73edfaaffb6bf24a87535bf20a8 (diff)
downloadlinux-11432050f070810ba139d0226344eef120c3a559.tar.bz2
usb: renesas_usbhs: gadget: fix NULL pointer dereference in ep_disable()
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>
Diffstat (limited to 'drivers/usb/renesas_usbhs/mod_gadget.c')
-rw-r--r--drivers/usb/renesas_usbhs/mod_gadget.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/usb/renesas_usbhs/mod_gadget.c b/drivers/usb/renesas_usbhs/mod_gadget.c
index 7a4521030505..ac51b594590d 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 (!pipe)
+ return -EINVAL;
+
usbhsg_pipe_disable(uep);
usbhs_pipe_free(pipe);