linux-kernel - [PATCH] vfs: Fix invalid ida

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Date:	Fri, 10 May 2013 14:04:11 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Al Viro <viro@...iv.linux.org.uk>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jean Delvare <jdelvare@...e.de>, crrodriguez@...nsuse.org
Subject: [PATCH] vfs: Fix invalid ida_remove() call

When the group id of a shared mount is not allocated, the umount still
tries to call mnt_release_group_id(), which eventually hits a kernel
warning at ida_remove() spewing a message like:
  ida_remove called for id=0 which is not allocated.

This patch fixes the bug simply checking the group id in the caller.

Reported-by: Cristian Rodríguez <crrodriguez@...nsuse.org>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
---
 fs/pnode.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/pnode.c b/fs/pnode.c
index 3d2a714..9af0df1 100644
--- a/fs/pnode.c
+++ b/fs/pnode.c
@@ -83,7 +83,8 @@ static int do_make_slave(struct mount *mnt)
 		if (peer_mnt == mnt)
 			peer_mnt = NULL;
 	}
-	if (IS_MNT_SHARED(mnt) && list_empty(&mnt->mnt_share))
+	if (mnt->mnt_group_id && IS_MNT_SHARED(mnt) &&
+	    list_empty(&mnt->mnt_share))
 		mnt_release_group_id(mnt);
 
 	list_del_init(&mnt->mnt_share);
-- 
1.8.2.1

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