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usblp: poison URBs upon disconnect

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syzkaller reported an URB that should have been killed to be active.
We do not understand it, but this should fix the issue if it is real.

Signed-off-by: Oliver Neukum <oneukum@suse.com>
Reported-by: syzbot+be5b5f86a162a6c281e6@syzkaller.appspotmail.com
Link: https://lore.kernel.org/r/20200507085806.5793-1-oneukum@suse.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Oliver Neukum 2020-05-07 10:58:06 +02:00 committed by Greg Kroah-Hartman
parent c22eb9374c
commit 296a193b06
1 changed files with 4 additions and 1 deletions
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5
drivers/usb/class/usblp.c
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@ -468,7 +468,8 @@ static int usblp_release(struct inode *inode, struct file *file)
usb_autopm_put_interface(usblp->intf);
if (!usblp->present) /* finish cleanup from disconnect */
usblp_cleanup(usblp);
usblp_cleanup(usblp); /* any URBs must be dead */
mutex_unlock(&usblp_mutex);
return 0;
}
@ -1375,9 +1376,11 @@ static void usblp_disconnect(struct usb_interface *intf)
usblp_unlink_urbs(usblp);
mutex_unlock(&usblp->mut);
usb_poison_anchored_urbs(&usblp->urbs);
if (!usblp->used)
usblp_cleanup(usblp);
mutex_unlock(&usblp_mutex);
}