linux-kernel - [PATCH 1/2] kernel/sys.c: return the current gid when error occurs

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Message-ID: <5200AD67.1030109@asianux.com>
Date:	Tue, 06 Aug 2013 16:01:43 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Kees Cook <keescook@...omium.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Oleg Nesterov <oleg@...hat.com>, holt@....com
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/2] kernel/sys.c: return the current gid when error occurs

According to the API definition, when error occurs, need return current
fsgid instead of the previous one.

The related informations ("man setfsgid"):

  RETURN VALUE
         On success, the previous value of fsgid is returned.  On error, the current value of fsgid is returned.

Signed-off-by: Chen Gang <gang.chen@...anux.com>
---
 kernel/sys.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/sys.c b/kernel/sys.c
index 771129b..9356dc8 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -775,11 +775,11 @@ SYSCALL_DEFINE1(setfsgid, gid_t, gid)
 
 	kgid = make_kgid(old->user_ns, gid);
 	if (!gid_valid(kgid))
-		return old_fsgid;
+		return gid;
 
 	new = prepare_creds();
 	if (!new)
-		return old_fsgid;
+		return gid;
 
 	if (gid_eq(kgid, old->gid)  || gid_eq(kgid, old->egid)  ||
 	    gid_eq(kgid, old->sgid) || gid_eq(kgid, old->fsgid) ||
@@ -791,7 +791,7 @@ SYSCALL_DEFINE1(setfsgid, gid_t, gid)
 	}
 
 	abort_creds(new);
-	return old_fsgid;
+	return gid;
 
 change_okay:
 	commit_creds(new);
-- 
1.7.7.6
--
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