[PATCH] USB: EHCI: fix dereference of ERR_PTR

[Sudip Mukherjee]

On error find_tt() returns either a NULL pointer or the error value in
ERR_PTR. But we were dereferencing it directly without even checking if
find_tt() returned a valid pointer or not.

Signed-off-by: Sudip Mukherjee <sudip@xxxxxxxxxxxxxxx>
---
 drivers/usb/host/ehci-sched.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c
index f9a3327..27bced7 100644
--- a/drivers/usb/host/ehci-sched.c
+++ b/drivers/usb/host/ehci-sched.c
@@ -257,6 +257,8 @@ static void reserve_release_intr_bandwidth(struct ehci_hcd *ehci,
 	/* FS/LS bus bandwidth */
 	if (tt_usecs) {
 		tt = find_tt(qh->ps.udev);
+		if (!tt || IS_ERR(tt))
+			return;
 		if (sign > 0)
 			list_add_tail(&qh->ps.ps_list, &tt->ps_list);
 		else
@@ -1373,6 +1375,8 @@ static void reserve_release_iso_bandwidth(struct ehci_hcd *ehci,
 		}
 
 		tt = find_tt(stream->ps.udev);
+		if (!tt || IS_ERR(tt))
+			return;
 		if (sign > 0)
 			list_add_tail(&stream->ps.ps_list, &tt->ps_list);
 		else
-- 
1.9.1

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