This is a note to let you know that I've just added the patch titled
usb: host: xhci: Fix possible wild pointer when handling abort command
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-host-xhci-fix-possible-wild-pointer-when-handling-abort-command.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 2a7cfdf37b7c08ac29df4c62ea5ccb01474b6597 Mon Sep 17 00:00:00 2001
From: Baolin Wang <baolin.wang@xxxxxxxxxx>
Date: Tue, 3 Jan 2017 18:28:47 +0200
Subject: usb: host: xhci: Fix possible wild pointer when handling abort command
From: Baolin Wang <baolin.wang@xxxxxxxxxx>
commit 2a7cfdf37b7c08ac29df4c62ea5ccb01474b6597 upstream.
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.
Signed-off-by: Baolin Wang <baolin.wang@xxxxxxxxxx>
Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/host/xhci-ring.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -1365,8 +1365,11 @@ static void handle_cmd_completion(struct
*/
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]));
Patches currently in stable-queue which might be from baolin.wang@xxxxxxxxxx are
queue-4.4/usb-host-xhci-fix-possible-wild-pointer-when-handling-abort-command.patch
queue-4.4/xhci-handle-command-completion-and-timeout-race.patch
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