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usb: host: xhci: Fix possible wild pointer when handling abort command 

When current command was supposed to be aborted, host will free the command
in handle_cmd_completion() function. But it might be still referenced by
xhci->current_cmd, which need to set NULL.

Cc: <stable@vger.kernel.org>
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Baolin Wang 2017-01-03 18:28:47 +02:00 committed by Greg Kroah-Hartman
parent 2b98546737
commit 2a7cfdf37b
1 changed files with 4 additions and 1 deletions
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5
drivers/usb/host/xhci-ring.c
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@ -1363,8 +1363,11 @@ static void handle_cmd_completion(struct xhci_hcd *xhci,
*/
if (cmd_comp_code == COMP_CMD_ABORT) {
xhci->cmd_ring_state = CMD_RING_STATE_STOPPED;
if (cmd->status == COMP_CMD_ABORT)
if (cmd->status == COMP_CMD_ABORT) {
if (xhci->current_cmd == cmd)
xhci->current_cmd = NULL;
goto event_handled;
}
}
cmd_type = TRB_FIELD_TO_TYPE(le32_to_cpu(cmd_trb->generic.field[3]));