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authorMike Rapoport <rppt@linux.vnet.ibm.com>2017-08-02 13:32:24 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-08-02 17:16:13 -0700
commit5a18b64e3f02125be1c0ef777501ae38aafe2a24 (patch)
tree88de1eff4972ac8c6acd682682e497f7a29f7eda /fs/userfaultfd.c
parentade9f91b32b964e83d294f4973d50083b08ef6fc (diff)
downloadlinux-5a18b64e3f02125be1c0ef777501ae38aafe2a24.tar.bz2
userfaultfd: non-cooperative: flush event_wqh at release time
There may still be threads waiting on event_wqh at the time the userfault file descriptor is closed. Flush the events wait-queue to prevent waiting threads from hanging. Link: http://lkml.kernel.org/r/1501398127-30419-1-git-send-email-rppt@linux.vnet.ibm.com Fixes: 9cd75c3cd4c3d ("userfaultfd: non-cooperative: add ability to report non-PF events from uffd descriptor") Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com> Cc: Pavel Emelyanov <xemul@virtuozzo.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/userfaultfd.c')
-rw-r--r--fs/userfaultfd.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c
index 2d8c2d848668..06ea26b8c996 100644
--- a/fs/userfaultfd.c
+++ b/fs/userfaultfd.c
@@ -854,6 +854,9 @@ wakeup:
__wake_up_locked_key(&ctx->fault_wqh, TASK_NORMAL, &range);
spin_unlock(&ctx->fault_pending_wqh.lock);
+ /* Flush pending events that may still wait on event_wqh */
+ wake_up_all(&ctx->event_wqh);
+
wake_up_poll(&ctx->fd_wqh, POLLHUP);
userfaultfd_ctx_put(ctx);
return 0;