Updated patch header: If CONFIG_DM_DEBUG_SPACE_MAPS is enabled and dm_sm_checker_create() fails, dm_tm_create_internal() would still return success even though it cleaned up all resources it was supposed to have created. This will lead to a kernel crash: general protection fault: 0000 [#1] SMP DEBUG_PAGEALLOC ... RIP: 0010:[<ffffffff81593659>] [<ffffffff81593659>] dm_bufio_get_block_size+0x9/0x20 Call Trace: [<ffffffff81599bae>] dm_bm_block_size+0xe/0x10 [<ffffffff8159b8b8>] sm_ll_init+0x78/0xd0 [<ffffffff8159c1a6>] sm_ll_new_disk+0x16/0xa0 [<ffffffff8159c98e>] dm_sm_disk_create+0xfe/0x160 [<ffffffff815abf6e>] dm_pool_metadata_open+0x16e/0x6a0 [<ffffffff815aa010>] pool_ctr+0x3f0/0x900 [<ffffffff8158d565>] dm_table_add_target+0x195/0x450 [<ffffffff815904c4>] table_load+0xe4/0x330 [<ffffffff815917ea>] ctl_ioctl+0x15a/0x2c0 [<ffffffff81591963>] dm_ctl_ioctl+0x13/0x20 [<ffffffff8116a4f8>] do_vfs_ioctl+0x98/0x560 [<ffffffff8116aa51>] sys_ioctl+0x91/0xa0 [<ffffffff81869f52>] system_call_fastpath+0x16/0x1b Fix the space map checker code to return an appropriate ERR_PTR and have dm_sm_disk_create() and dm_tm_create_internal() check for it with IS_ERR. Reported-by: Vivek Goyal <vgoyal@xxxxxxxxxx> Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx> Cc: stable@xxxxxxxxxxxxxxx -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
