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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Bob Peterson <rpeterso@redhat.com>,
        Andreas Gruenbacher <agruenba@redhat.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.19 033/101] gfs2: Add missing truncate_inode_pages_final for sd_aspace
Date:   Tue, 17 Nov 2020 14:05:00 +0100
Message-Id: <20201117122114.696869757@linuxfoundation.org>
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From: Bob Peterson <rpeterso@redhat.com>

[ Upstream commit a9dd945ccef07a904e412f208f8de708a3d7159e ]

Gfs2 creates an address space for its rgrps called sd_aspace, but it never
called truncate_inode_pages_final on it. This confused vfs greatly which
tried to reference the address space after gfs2 had freed the superblock
that contained it.

This patch adds a call to truncate_inode_pages_final for sd_aspace, thus
avoiding the use-after-free.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/gfs2/super.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c
index a971862b186e3..22cd68bd8c9b0 100644
--- a/fs/gfs2/super.c
+++ b/fs/gfs2/super.c
@@ -934,6 +934,7 @@ restart:
 	gfs2_jindex_free(sdp);
 	/*  Take apart glock structures and buffer lists  */
 	gfs2_gl_hash_clear(sdp);
+	truncate_inode_pages_final(&sdp->sd_aspace);
 	gfs2_delete_debugfs_file(sdp);
 	/*  Unmount the locking protocol  */
 	gfs2_lm_unmount(sdp);
-- 
2.27.0