[PATCH] bsdacct: fix uid/gid misreporting (#14676)

[Alexey Dobriyan <adobriyan@gmail.com>]

commit d8e180dcd5bbbab9cd3ff2e779efcf70692ef541
"bsdacct: switch credentials for writing to the accounting file"
introduced credential switching during final acct data collecting.
However, uid/gid pair continued to be collected from current which
became credentials of who created acct file, not who exits.

Fix http://bugzilla.kernel.org/show_bug.cgi?id=14676

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
---

 Juho, please, confirm.

 kernel/acct.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/kernel/acct.c
+++ b/kernel/acct.c
@@ -536,7 +536,8 @@ static void do_acct_process(struct bsd_acct_struct *acct,
 	do_div(elapsed, AHZ);
 	ac.ac_btime = get_seconds() - elapsed;
 	/* we really need to bite the bullet and change layout */
-	current_uid_gid(&ac.ac_uid, &ac.ac_gid);
+	ac.ac_uid = orig_cred->uid;
+	ac.ac_gid = orig_cred->gid;
 #if ACCT_VERSION==2
 	ac.ac_ahz = AHZ;
 #endif