diff options
| author | Lalithambika Krishna Kumar <lalithambika.krishnakumar@intel.com> | 2021-01-29 15:00:27 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-01-29 14:16:50 +0100 |
| commit | 296fcdab3321de0aca7a033e4469f4a2dd55fe96 (patch) | |
| tree | 71bf6a6995731ed754b55c4be1c4d81f337d5d55 /drivers/usb/host/xhci-ring.c | |
| parent | 04d21f7219acec66751f5512aa8a69f528c5b36a (diff) | |
xhci: check slot_id is valid before gathering slot info
Check that the slot_id that we dug out from command completion event
TRB, is valid before using it to identify the slot associated with the
command that generated the event.
Signed-off-by: Lalithambika Krishna Kumar <lalithambika.krishnakumar@intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20210129130044.206855-11-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/host/xhci-ring.c')
| -rw-r--r-- | drivers/usb/host/xhci-ring.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index 2ef55484317e..69c7c5ab1565 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -1430,7 +1430,7 @@ time_out_completed: static void handle_cmd_completion(struct xhci_hcd *xhci, struct xhci_event_cmd *event) { - int slot_id = TRB_TO_SLOT_ID(le32_to_cpu(event->flags)); + unsigned int slot_id = TRB_TO_SLOT_ID(le32_to_cpu(event->flags)); u64 cmd_dma; dma_addr_t cmd_dequeue_dma; u32 cmd_comp_code; @@ -1438,6 +1438,11 @@ static void handle_cmd_completion(struct xhci_hcd *xhci, struct xhci_command *cmd; u32 cmd_type; + if (slot_id >= MAX_HC_SLOTS) { + xhci_warn(xhci, "Invalid slot_id %u\n", slot_id); + return; + } + cmd_dma = le64_to_cpu(event->cmd_trb); cmd_trb = xhci->cmd_ring->dequeue; |