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ocfs2: fix memory leak in ocfs2_mount_volume() 

There is a memory leak reported by kmemleak:

  unreferenced object 0xffff88810cc65e60 (size 32):
    comm "mount.ocfs2", pid 23753, jiffies 4302528942 (age 34735.105s)
    hex dump (first 32 bytes):
      10 00 00 00 00 00 00 00 00 01 01 01 01 01 01 01  ................
      01 01 01 01 01 01 01 01 00 00 00 00 00 00 00 00  ................
    backtrace:
      [<ffffffff8170f73d>] __kmalloc+0x4d/0x150
      [<ffffffffa0ac3f51>] ocfs2_compute_replay_slots+0x121/0x330 [ocfs2]
      [<ffffffffa0b65165>] ocfs2_check_volume+0x485/0x900 [ocfs2]
      [<ffffffffa0b68129>] ocfs2_mount_volume.isra.0+0x1e9/0x650 [ocfs2]
      [<ffffffffa0b7160b>] ocfs2_fill_super+0xe0b/0x1740 [ocfs2]
      [<ffffffff818e1fe2>] mount_bdev+0x312/0x400
      [<ffffffff819a086d>] legacy_get_tree+0xed/0x1d0
      [<ffffffff818de82d>] vfs_get_tree+0x7d/0x230
      [<ffffffff81957f92>] path_mount+0xd62/0x1760
      [<ffffffff81958a5a>] do_mount+0xca/0xe0
      [<ffffffff81958d3c>] __x64_sys_mount+0x12c/0x1a0
      [<ffffffff82f26f15>] do_syscall_64+0x35/0x80
      [<ffffffff8300006a>] entry_SYSCALL_64_after_hwframe+0x46/0xb0

This call stack is related to two problems.  Firstly, the ocfs2 super uses
"replay_map" to trace online/offline slots, in order to recover offline
slots during recovery and mount.  But when ocfs2_truncate_log_init()
returns an error in ocfs2_mount_volume(), the memory of "replay_map" will
not be freed in error handling path.  Secondly, the memory of "replay_map"
will not be freed if d_make_root() returns an error in ocfs2_fill_super().
But the memory of "replay_map" will be freed normally when completing
recovery and mount in ocfs2_complete_mount_recovery().

Fix the first problem by adding error handling path to free "replay_map"
when ocfs2_truncate_log_init() fails.  And fix the second problem by
calling ocfs2_free_replay_slots(osb) in the error handling path
"out_dismount".  In addition, since ocfs2_free_replay_slots() is static,
it is necessary to remove its static attribute and declare it in header
file.

Link: https://lkml.kernel.org/r/20221109074627.2303950-1-lizetao1@huawei.com
Fixes: 9140db04ef ("ocfs2: recover orphans in offline slots during recovery and mount")
Signed-off-by: Li Zetao <lizetao1@huawei.com>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Jun Piao <piaojun@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Li Zetao 2022-11-09 15:46:27 +08:00 committed by Andrew Morton
parent fc0e738792
commit ce2fcf1516
3 changed files with 6 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/ocfs2/journal.c
View File

@ -157,7 +157,7 @@ static void ocfs2_queue_replay_slots(struct ocfs2_super *osb,
replay_map->rm_state = REPLAY_DONE;
}
static void ocfs2_free_replay_slots(struct ocfs2_super *osb)
void ocfs2_free_replay_slots(struct ocfs2_super *osb)
{
struct ocfs2_replay_map *replay_map = osb->replay_map;

1
fs/ocfs2/journal.h
View File

@ -150,6 +150,7 @@ int ocfs2_recovery_init(struct ocfs2_super *osb);
void ocfs2_recovery_exit(struct ocfs2_super *osb);
int ocfs2_compute_replay_slots(struct ocfs2_super *osb);
void ocfs2_free_replay_slots(struct ocfs2_super *osb);
/*
* Journal Control:
* Initialize, Load, Shutdown, Wipe a journal.

5
fs/ocfs2/super.c
View File

@ -1159,6 +1159,7 @@ static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
out_dismount:
atomic_set(&osb->vol_state, VOLUME_DISABLED);
wake_up(&osb->osb_mount_event);
ocfs2_free_replay_slots(osb);
ocfs2_dismount_volume(sb, 1);
goto out;
@ -1822,12 +1823,14 @@ static int ocfs2_mount_volume(struct super_block *sb)
status = ocfs2_truncate_log_init(osb);
if (status < 0) {
mlog_errno(status);
goto out_system_inodes;
goto out_check_volume;
}
ocfs2_super_unlock(osb, 1);
return 0;
out_check_volume:
ocfs2_free_replay_slots(osb);
out_system_inodes:
if (osb->local_alloc_state == OCFS2_LA_ENABLED)
ocfs2_shutdown_local_alloc(osb);