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author | Javier Carrasco <javier.carrasco.cruz@gmail.com> | 2023-10-14 06:11:33 +0300 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-10-25 12:54:15 +0300 |
commit | cd2fbfd8b922b7fdd50732e47d797754ab59cb06 (patch) | |
tree | 6371846d5fdfdaf9857e24cbc4d53b77169f7b6e | |
parent | 27b6c809d3937275576c297a72290f618db3f45b (diff) | |
download | linux-cd2fbfd8b922b7fdd50732e47d797754ab59cb06.tar.xz |
Input: powermate - fix use-after-free in powermate_config_complete
commit 5c15c60e7be615f05a45cd905093a54b11f461bc upstream.
syzbot has found a use-after-free bug [1] in the powermate driver. This
happens when the device is disconnected, which leads to a memory free from
the powermate_device struct. When an asynchronous control message
completes after the kfree and its callback is invoked, the lock does not
exist anymore and hence the bug.
Use usb_kill_urb() on pm->config to cancel any in-progress requests upon
device disconnection.
[1] https://syzkaller.appspot.com/bug?extid=0434ac83f907a1dbdd1e
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Reported-by: syzbot+0434ac83f907a1dbdd1e@syzkaller.appspotmail.com
Link: https://lore.kernel.org/r/20230916-topic-powermate_use_after_free-v3-1-64412b81a7a2@gmail.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r-- | drivers/input/misc/powermate.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/input/misc/powermate.c b/drivers/input/misc/powermate.c index c4e0e1886061..6b1b95d58e6b 100644 --- a/drivers/input/misc/powermate.c +++ b/drivers/input/misc/powermate.c @@ -425,6 +425,7 @@ static void powermate_disconnect(struct usb_interface *intf) pm->requires_update = 0; usb_kill_urb(pm->irq); input_unregister_device(pm->input); + usb_kill_urb(pm->config); usb_free_urb(pm->irq); usb_free_urb(pm->config); powermate_free_buffers(interface_to_usbdev(intf), pm); |