From: Greg Kurz <groug@kaod.org>
Date: Mon, 6 Mar 2017 16:34:01 +0000 (+0100)
Subject: 9pfs: don't use AT_EMPTY_PATH in local_set_cred_passthrough()
X-Git-Tag: v2.8.1~76
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=7e9a1c49145d981e6da03d8e0ec16a329c79f2ca;p=thirdparty%2Fqemu.git

9pfs: don't use AT_EMPTY_PATH in local_set_cred_passthrough()

The name argument can never be an empty string, and dirfd always point to
the containing directory of the file name. AT_EMPTY_PATH is hence useless
here. Also it breaks build with glibc version 2.13 and older.

It is actually an oversight of a previous tentative patch to implement this
function. We can safely drop it.

Reported-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: Greg Kurz <groug@kaod.org>
Tested-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Eric Blake <eblake@redhat.com>
(cherry picked from commit b314f6a077a1dbc0463a5dc41162f64950048e72)
Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---

diff --git a/hw/9pfs/9p-local.c b/hw/9pfs/9p-local.c
index 09b9b576c01..f282bb7d66a 100644
--- a/hw/9pfs/9p-local.c
+++ b/hw/9pfs/9p-local.c
@@ -349,7 +349,7 @@ static int local_set_cred_passthrough(FsContext *fs_ctx, int dirfd,
                                       const char *name, FsCred *credp)
 {
     if (fchownat(dirfd, name, credp->fc_uid, credp->fc_gid,
-                 AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH) < 0) {
+                 AT_SYMLINK_NOFOLLOW) < 0) {
         /*
          * If we fail to change ownership and if we are
          * using security model none. Ignore the error