From d1c0e1587e6874cec3e3615097b907a9186505c8 Mon Sep 17 00:00:00 2001 From: Benjamin Marzinski Date: Tue, 31 Jan 2023 15:22:57 -0600 Subject: [PATCH] dm table: check that a dm device doesn't reference itself If a DM device's table references itself, it will crash the kernel with an infinite recursion. Check for a self-reference in dm_get_device(). This is a quick check, but it won't catch more complicated circular references. Signed-off-by: Benjamin Marzinski Signed-off-by: Mike Snitzer --- drivers/md/dm-table.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index 8541d56..24ad42b 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -364,6 +364,8 @@ int dm_get_device(struct dm_target *ti, const char *path, fmode_t mode, if (!dev) return -ENODEV; } + if (dev == disk_devt(t->md->disk)) + return -EINVAL; dd = find_device(&t->devices, dev); if (!dd) { -- 2.7.4