[PATCH 5.4 087/155] ceph: fix memory leak in ceph_cleanup_snapid_map()

Greg Kroah-Hartman
2020-03-31T09:15:18Z

From: Luis Henriques <lhenriques@suse.com>

commit c8d6ee01449cd0d2f30410681cccb616a88f50b1 upstream.

kmemleak reports the following memory leak:

unreferenced object 0xffff88821feac8a0 (size 96):
comm "kworker/1:0", pid 17, jiffies 4294896362 (age 20.512s)
hex dump (first 32 bytes):
a0 c8 ea 1f 82 88 ff ff 00 c9 ea 1f 82 88 ff ff ................
00 00 00 00 00 00 00 00 00 01 00 00 00 00 ad de ................
backtrace:
[<00000000b3ea77fb>] ceph_get_snapid_map+0x75/0x2a0
[<00000000d4060942>] fill_inode+0xb26/0x1010
[<0000000049da6206>] ceph_readdir_prepopulate+0x389/0xc40
[<00000000e2fe2549>] dispatch+0x11ab/0x1521
[<000000007700b894>] ceph_con_workfn+0xf3d/0x3240
[<0000000039138a41>] process_one_work+0x24d/0x590
[<00000000eb751f34>] worker_thread+0x4a/0x3d0
[<000000007e8f0d42>] kthread+0xfb/0x130
[<00000000d49bd1fa>] ret_from_fork+0x3a/0x50

A kfree is missing while looping the 'to_free' list of ceph_snapid_map
objects.

Cc: stable@vger.kernel.org
Fixes: 75c9627efb72 ("ceph: map snapid to anonymous bdev ID")
Signed-off-by: Luis Henriques <lhenriques@suse.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
fs/ceph/snap.c | 1 +
1 file changed, 1 insertion(+)

--- a/fs/ceph/snap.c
+++ b/fs/ceph/snap.c
@@ -1155,5 +1155,6 @@ void ceph_cleanup_snapid_map(struct ceph
pr_err("snapid map %llx -> %x still in use\n",
sm->snap, sm->dev);
}
+ kfree(sm);
}
}