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| author | Romain Izard <romain.izard.pro@gmail.com> | 2018-09-20 16:49:04 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-10-13 09:33:15 +0200 |
| commit | 274a367121ae4b0db3d3b4bf15fcb091d005cfba (patch) | |
| tree | 9a78b6c3e45f2c403e57e3bc1d839a492327ed45 /drivers/usb | |
| parent | 6f0a2f6649b7642283dd76101db0862dc62263ce (diff) | |
| download | linux-stable-274a367121ae4b0db3d3b4bf15fcb091d005cfba.tar.gz linux-stable-274a367121ae4b0db3d3b4bf15fcb091d005cfba.tar.bz2 linux-stable-274a367121ae4b0db3d3b4bf15fcb091d005cfba.zip | |
usb: cdc_acm: Do not leak URB buffers
commit f2924d4b16ae138c2de6a0e73f526fb638330858 upstream.
When the ACM TTY port is disconnected, the URBs it uses must be killed, and
then the buffers must be freed. Unfortunately a previous refactor removed
the code freeing the buffers because it looked extremely similar to the
code killing the URBs.
As a result, there were many new leaks for each plug/unplug cycle of a
CDC-ACM device, that were detected by kmemleak.
Restore the missing code, and the memory leak is removed.
Fixes: ba8c931ded8d ("cdc-acm: refactor killing urbs")
Signed-off-by: Romain Izard <romain.izard.pro@gmail.com>
Acked-by: Oliver Neukum <oneukum@suse.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/class/cdc-acm.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index f8ee32d9843a..84f52774810a 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -1514,6 +1514,7 @@ static void acm_disconnect(struct usb_interface *intf) { struct acm *acm = usb_get_intfdata(intf); struct tty_struct *tty; + int i; /* sibling interface is already cleaning up */ if (!acm) @@ -1544,6 +1545,11 @@ static void acm_disconnect(struct usb_interface *intf) tty_unregister_device(acm_tty_driver, acm->minor); + usb_free_urb(acm->ctrlurb); + for (i = 0; i < ACM_NW; i++) + usb_free_urb(acm->wb[i].urb); + for (i = 0; i < acm->rx_buflimit; i++) + usb_free_urb(acm->read_urbs[i]); acm_write_buffers_free(acm); usb_free_coherent(acm->dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma); acm_read_buffers_free(acm); |