The patch titled
Subject: ocfs2: fix a use after free on error
has been added to the -mm tree. Its filename is
ocfs2-fix-a-use-after-free-on-error.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/ocfs2-fix-a-use-after-free-on-error.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/ocfs2-fix-a-use-after-free-on-error.patch
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------------------------------------------------------
From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Subject: ocfs2: fix a use after free on error
The error handling in this function frees "reg" but it is still on the
"o2hb_all_regions" list so it will lead to a use after freew. Joseph Qi
points out that we need to clear the bit in the "o2hb_region_bitmap" as
well
Link: https://lkml.kernel.org/r/YBk4M6HUG8jB/jc7@mwanda
Fixes: 1cf257f51191 ("ocfs2: fix memory leak")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Reviewed-by: Joseph Qi <joseph.qi@xxxxxxxxxxxxxxxxx>
Cc: Mark Fasheh <mark@xxxxxxxxxx>
Cc: Joel Becker <jlbec@xxxxxxxxxxxx>
Cc: Junxiao Bi <junxiao.bi@xxxxxxxxxx>
Cc: Changwei Ge <gechangwei@xxxxxxx>
Cc: Gang He <ghe@xxxxxxxx>
Cc: Jun Piao <piaojun@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/ocfs2/cluster/heartbeat.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
--- a/fs/ocfs2/cluster/heartbeat.c~ocfs2-fix-a-use-after-free-on-error
+++ a/fs/ocfs2/cluster/heartbeat.c
@@ -2042,7 +2042,7 @@ static struct config_item *o2hb_heartbea
o2hb_nego_timeout_handler,
reg, NULL, ®->hr_handler_list);
if (ret)
- goto free;
+ goto remove_item;
ret = o2net_register_handler(O2HB_NEGO_APPROVE_MSG, reg->hr_key,
sizeof(struct o2hb_nego_msg),
@@ -2057,6 +2057,12 @@ static struct config_item *o2hb_heartbea
unregister_handler:
o2net_unregister_handler_list(®->hr_handler_list);
+remove_item:
+ spin_lock(&o2hb_live_lock);
+ list_del(®->hr_all_item);
+ if (o2hb_global_heartbeat_active())
+ clear_bit(reg->hr_region_num, o2hb_region_bitmap);
+ spin_unlock(&o2hb_live_lock);
free:
kfree(reg);
return ERR_PTR(ret);
_
Patches currently in -mm which might be from dan.carpenter@xxxxxxxxxx are
ocfs2-fix-a-use-after-free-on-error.patch
