fuse: revalidate: don't invalidate if interrupted

commit a9d1c4c6df0e568207907c04aed9e7beb1294c42 upstream.

If the LOOKUP request triggered from fuse_dentry_revalidate() is
interrupted, then the dentry will be invalidated, possibly resulting in
submounts being unmounted.

Reported-by: Xu Rongbo <xurongbo@baidu.com>
Closes: https://lore.kernel.org/all/CAJfpegswN_CJJ6C3RZiaK6rpFmNyWmXfaEpnQUJ42KCwNF5tWw@mail.gmail.com/
Fixes: 9e6268db496a ("[PATCH] FUSE - read-write operations")
Cc: <stable@vger.kernel.org>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 904673a4f69020ef712082bacb2487ec28332e5b..5e408e7ec4c6b7154a370a4e0680fa6c47e74618 100644 (file)
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -258,7 +258,7 @@ static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags)
                        spin_unlock(&fi->lock);
                }
                kfree(forget);
-               if (ret == -ENOMEM)
+               if (ret == -ENOMEM || ret == -EINTR)
                        goto out;
                if (ret || fuse_invalid_attr(&outarg.attr) ||
                    fuse_stale_inode(inode, outarg.generation, &outarg.attr))