Commit 2a7cfdf3 authored by Baolin Wang's avatar Baolin Wang Committed by Greg Kroah-Hartman

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: default avatarBaolin Wang <baolin.wang@linaro.org>
Signed-off-by: default avatarMathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 2b985467
...@@ -1363,9 +1363,12 @@ static void handle_cmd_completion(struct xhci_hcd *xhci, ...@@ -1363,9 +1363,12 @@ static void handle_cmd_completion(struct xhci_hcd *xhci,
*/ */
if (cmd_comp_code == COMP_CMD_ABORT) { if (cmd_comp_code == COMP_CMD_ABORT) {
xhci->cmd_ring_state = CMD_RING_STATE_STOPPED; 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; goto event_handled;
} }
}
cmd_type = TRB_FIELD_TO_TYPE(le32_to_cpu(cmd_trb->generic.field[3])); cmd_type = TRB_FIELD_TO_TYPE(le32_to_cpu(cmd_trb->generic.field[3]));
switch (cmd_type) { switch (cmd_type) {
......
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