[PATCH 3.12 126/144] GFS2: Fix use-after-free race when calling gfs2_remove_from_ail

From: Greg Kroah-Hartman
Date: Mon Jan 06 2014 - 18:43:43 EST

3.12-stable review patch. If anyone has any objections, please let me know.


From: Bob Peterson <rpeterso@xxxxxxxxxx>

commit 9290a9a7c0bcf5400e8dbfbf9707fa68ea3fb338 upstream.

Function gfs2_remove_from_ail drops the reference on the bh via
brelse. This patch fixes a race condition whereby bh is deferenced
after the brelse when setting bd->bd_blkno = bh->b_blocknr;
Under certain rare circumstances, bh might be gone or reused,
and bd->bd_blkno is set to whatever that memory happens to be,
which is often 0. Later, in gfs2_trans_add_unrevoke, that bd fails
the test "bd->bd_blkno >= blkno" which causes it to never be freed.
The end result is that the bd is never freed from the bufdata cache,
which results in this error:
slab error in kmem_cache_destroy(): cache `gfs2_bufdata': Can't free all objects

Signed-off-by: Bob Peterson <rpeterso@xxxxxxxxxx>
Signed-off-by: Steven Whitehouse <swhiteho@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

fs/gfs2/log.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -551,10 +551,10 @@ void gfs2_add_revoke(struct gfs2_sbd *sd
struct buffer_head *bh = bd->bd_bh;
struct gfs2_glock *gl = bd->bd_gl;

- gfs2_remove_from_ail(bd);
- bd->bd_bh = NULL;
bh->b_private = NULL;
bd->bd_blkno = bh->b_blocknr;
+ gfs2_remove_from_ail(bd); /* drops ref on bh */
+ bd->bd_bh = NULL;
bd->bd_ops = &gfs2_revoke_lops;

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/