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| author | Jianchao Wang <jianchao.w.wang@oracle.com> | 2018-05-04 10:01:57 +0200 |
|---|---|---|
| committer | Keith Busch <keith.busch@intel.com> | 2018-05-07 16:25:08 +0200 |
| commit | 12d9f07022dcde261ad16e9a11f45096dc68b03c (patch) | |
| tree | ed9a7b0d36e42fc0bb7fd2b3338ab9c6cc3b14a2 /drivers/nvme | |
| parent | Linux 4.17-rc4 (diff) | |
| download | linux-12d9f07022dcde261ad16e9a11f45096dc68b03c.tar.xz linux-12d9f07022dcde261ad16e9a11f45096dc68b03c.zip | |
nvme: fix use-after-free in nvme_free_ns_head
Currently only nvme_ctrl will take a reference counter of
nvme_subsystem, nvme_ns_head also needs it. Otherwise
nvme_free_ns_head will access the nvme_subsystem.ns_ida
which has been freed by __nvme_release_subsystem after all the
reference of nvme_subsystem have been released by nvme_free_ctrl.
This could cause memory corruption.
BUG: KASAN: use-after-free in radix_tree_next_chunk+0x9f/0x4b0
Read of size 8 at addr ffff88036494d2e8 by task fio/1815
CPU: 1 PID: 1815 Comm: fio Kdump: loaded Tainted: G W 4.17.0-rc1+ #18
Hardware name: LENOVO 10MLS0E339/3106, BIOS M1AKT22A 06/27/2017
Call Trace:
dump_stack+0x91/0xeb
print_address_description+0x6b/0x290
kasan_report+0x261/0x360
radix_tree_next_chunk+0x9f/0x4b0
ida_remove+0x8b/0x180
ida_simple_remove+0x26/0x40
nvme_free_ns_head+0x58/0xc0
__blkdev_put+0x30a/0x3a0
blkdev_close+0x44/0x50
__fput+0x184/0x380
task_work_run+0xaf/0xe0
do_exit+0x501/0x1440
do_group_exit+0x89/0x140
__x64_sys_exit_group+0x28/0x30
do_syscall_64+0x72/0x230
Signed-off-by: Jianchao Wang <jianchao.w.wang@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Keith Busch <keith.busch@intel.com>
Diffstat (limited to 'drivers/nvme')
| -rw-r--r-- | drivers/nvme/host/core.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index a3771c5729f5..2cbc378bc0d6 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -99,6 +99,7 @@ static struct class *nvme_subsys_class; static void nvme_ns_remove(struct nvme_ns *ns); static int nvme_revalidate_disk(struct gendisk *disk); +static void nvme_put_subsystem(struct nvme_subsystem *subsys); int nvme_reset_ctrl(struct nvme_ctrl *ctrl) { @@ -350,6 +351,7 @@ static void nvme_free_ns_head(struct kref *ref) ida_simple_remove(&head->subsys->ns_ida, head->instance); list_del_init(&head->entry); cleanup_srcu_struct(&head->srcu); + nvme_put_subsystem(head->subsys); kfree(head); } @@ -2861,6 +2863,9 @@ static struct nvme_ns_head *nvme_alloc_ns_head(struct nvme_ctrl *ctrl, goto out_cleanup_srcu; list_add_tail(&head->entry, &ctrl->subsys->nsheads); + + kref_get(&ctrl->subsys->ref); + return head; out_cleanup_srcu: cleanup_srcu_struct(&head->srcu); |