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| author | Serge Hallyn <serge.hallyn@canonical.com> | 2011-09-26 10:18:29 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-09-26 16:12:26 -0700 |
| commit | aec01c5895051849ed842dc5b8794017a7751f28 (patch) | |
| tree | 0dcf873f047c48a7f3513349c13998b048e4e0fd /drivers/usb/core/devio.c | |
| parent | 5c12e7856d75f68c1ca8372d6cc76cdbc71763c0 (diff) | |
| download | linux-aec01c5895051849ed842dc5b8794017a7751f28.tar.gz linux-aec01c5895051849ed842dc5b8794017a7751f28.tar.bz2 linux-aec01c5895051849ed842dc5b8794017a7751f28.zip | |
USB: pid_ns: ensure pid is not freed during kill_pid_info_as_uid
Alan Stern points out that after spin_unlock(&ps->lock) there is no
guarantee that ps->pid won't be freed. Since kill_pid_info_as_uid() is
called after the spin_unlock(), the pid passed to it must be pinned.
Reported-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Serge Hallyn <serge.hallyn@canonical.com>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/core/devio.c')
| -rw-r--r-- | drivers/usb/core/devio.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c index 37518dfdeb98..eea53ebe6706 100644 --- a/drivers/usb/core/devio.c +++ b/drivers/usb/core/devio.c @@ -407,7 +407,7 @@ static void async_completed(struct urb *urb) sinfo.si_errno = as->status; sinfo.si_code = SI_ASYNCIO; sinfo.si_addr = as->userurb; - pid = as->pid; + pid = get_pid(as->pid); uid = as->uid; euid = as->euid; secid = as->secid; @@ -422,9 +422,11 @@ static void async_completed(struct urb *urb) cancel_bulk_urbs(ps, as->bulk_addr); spin_unlock(&ps->lock); - if (signr) + if (signr) { kill_pid_info_as_uid(sinfo.si_signo, &sinfo, pid, uid, euid, secid); + put_pid(pid); + } wake_up(&ps->wait); } |