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>
---
v2: used IS_ERR_OR_NULL (didn't know it was there. thanks)
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..de75343 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 (IS_ERR_OR_NULL(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 (IS_ERR_OR_NULL(tt))
+ return;
if (sign > 0)
list_add_tail(&stream->ps.ps_list, &tt->ps_list);
else
--
1.9.1
--
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