[PATCH 5.4 056/151] gfs2: Add missing truncate_inode_pages_final for sd_aspace

From: Greg Kroah-Hartman
Date: Tue Nov 17 2020 - 08:25:05 EST


From: Bob Peterson <rpeterso@xxxxxxxxxx>

[ 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@xxxxxxxxxx>
Signed-off-by: Andreas Gruenbacher <agruenba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
fs/gfs2/super.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c
index 5935ce5ae5636..50c925d9c6103 100644
--- a/fs/gfs2/super.c
+++ b/fs/gfs2/super.c
@@ -689,6 +689,7 @@ 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