This is a note to let you know that I've just added the patch titled nvme-multipath: fix double initialization of ANA state to the 5.12-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: nvme-multipath-fix-double-initialization-of-ana-state.patch and it can be found in the queue-5.12 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 5e1f689913a4498e3081093670ef9d85b2c60920 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig <hch@xxxxxx> Date: Thu, 29 Apr 2021 14:18:53 +0200 Subject: nvme-multipath: fix double initialization of ANA state From: Christoph Hellwig <hch@xxxxxx> commit 5e1f689913a4498e3081093670ef9d85b2c60920 upstream. nvme_init_identify and thus nvme_mpath_init can be called multiple times and thus must not overwrite potentially initialized or in-use fields. Split out a helper for the basic initialization when the controller is initialized and make sure the init_identify path does not blindly change in-use data structures. Fixes: 0d0b660f214d ("nvme: add ANA support") Reported-by: Martin Wilck <mwilck@xxxxxxxx> Signed-off-by: Christoph Hellwig <hch@xxxxxx> Reviewed-by: Keith Busch <kbusch@xxxxxxxxxx> Reviewed-by: Sagi Grimberg <sagi@xxxxxxxxxxx> Reviewed-by: Hannes Reinecke <hare@xxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/nvme/host/core.c | 3 +- drivers/nvme/host/multipath.c | 55 ++++++++++++++++++++++-------------------- drivers/nvme/host/nvme.h | 8 ++++-- 3 files changed, 37 insertions(+), 29 deletions(-) --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -3190,7 +3190,7 @@ int nvme_init_identify(struct nvme_ctrl ctrl->hmmaxd = le16_to_cpu(id->hmmaxd); } - ret = nvme_mpath_init(ctrl, id); + ret = nvme_mpath_init_identify(ctrl, id); kfree(id); if (ret < 0) @@ -4580,6 +4580,7 @@ int nvme_init_ctrl(struct nvme_ctrl *ctr min(default_ps_max_latency_us, (unsigned long)S32_MAX)); nvme_fault_inject_init(&ctrl->fault_inject, dev_name(ctrl->device)); + nvme_mpath_init_ctrl(ctrl); return 0; out_free_name: --- a/drivers/nvme/host/multipath.c +++ b/drivers/nvme/host/multipath.c @@ -709,9 +709,18 @@ void nvme_mpath_remove_disk(struct nvme_ put_disk(head->disk); } -int nvme_mpath_init(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id) +void nvme_mpath_init_ctrl(struct nvme_ctrl *ctrl) { - int error; + mutex_init(&ctrl->ana_lock); + timer_setup(&ctrl->anatt_timer, nvme_anatt_timeout, 0); + INIT_WORK(&ctrl->ana_work, nvme_ana_work); +} + +int nvme_mpath_init_identify(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id) +{ + size_t max_transfer_size = ctrl->max_hw_sectors << SECTOR_SHIFT; + size_t ana_log_size; + int error = 0; /* check if multipath is enabled and we have the capability */ if (!multipath || !ctrl->subsys || @@ -723,37 +732,31 @@ int nvme_mpath_init(struct nvme_ctrl *ct ctrl->nanagrpid = le32_to_cpu(id->nanagrpid); ctrl->anagrpmax = le32_to_cpu(id->anagrpmax); - mutex_init(&ctrl->ana_lock); - timer_setup(&ctrl->anatt_timer, nvme_anatt_timeout, 0); - ctrl->ana_log_size = sizeof(struct nvme_ana_rsp_hdr) + - ctrl->nanagrpid * sizeof(struct nvme_ana_group_desc); - ctrl->ana_log_size += ctrl->max_namespaces * sizeof(__le32); - - if (ctrl->ana_log_size > ctrl->max_hw_sectors << SECTOR_SHIFT) { + ana_log_size = sizeof(struct nvme_ana_rsp_hdr) + + ctrl->nanagrpid * sizeof(struct nvme_ana_group_desc) + + ctrl->max_namespaces * sizeof(__le32); + if (ana_log_size > max_transfer_size) { dev_err(ctrl->device, - "ANA log page size (%zd) larger than MDTS (%d).\n", - ctrl->ana_log_size, - ctrl->max_hw_sectors << SECTOR_SHIFT); + "ANA log page size (%zd) larger than MDTS (%zd).\n", + ana_log_size, max_transfer_size); dev_err(ctrl->device, "disabling ANA support.\n"); - return 0; + goto out_uninit; } - - INIT_WORK(&ctrl->ana_work, nvme_ana_work); - kfree(ctrl->ana_log_buf); - ctrl->ana_log_buf = kmalloc(ctrl->ana_log_size, GFP_KERNEL); - if (!ctrl->ana_log_buf) { - error = -ENOMEM; - goto out; + if (ana_log_size > ctrl->ana_log_size) { + nvme_mpath_stop(ctrl); + kfree(ctrl->ana_log_buf); + ctrl->ana_log_buf = kmalloc(ctrl->ana_log_size, GFP_KERNEL); + if (!ctrl->ana_log_buf) + return -ENOMEM; } - + ctrl->ana_log_size = ana_log_size; error = nvme_read_ana_log(ctrl); if (error) - goto out_free_ana_log_buf; + goto out_uninit; return 0; -out_free_ana_log_buf: - kfree(ctrl->ana_log_buf); - ctrl->ana_log_buf = NULL; -out: + +out_uninit: + nvme_mpath_uninit(ctrl); return error; } --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -668,7 +668,8 @@ void nvme_kick_requeue_lists(struct nvme int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl,struct nvme_ns_head *head); void nvme_mpath_add_disk(struct nvme_ns *ns, struct nvme_id_ns *id); void nvme_mpath_remove_disk(struct nvme_ns_head *head); -int nvme_mpath_init(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id); +int nvme_mpath_init_identify(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id); +void nvme_mpath_init_ctrl(struct nvme_ctrl *ctrl); void nvme_mpath_uninit(struct nvme_ctrl *ctrl); void nvme_mpath_stop(struct nvme_ctrl *ctrl); bool nvme_mpath_clear_current_path(struct nvme_ns *ns); @@ -742,7 +743,10 @@ static inline void nvme_mpath_check_last static inline void nvme_trace_bio_complete(struct request *req) { } -static inline int nvme_mpath_init(struct nvme_ctrl *ctrl, +static inline void nvme_mpath_init_ctrl(struct nvme_ctrl *ctrl) +{ +} +static inline int nvme_mpath_init_identify(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id) { if (ctrl->subsys->cmic & (1 << 3)) Patches currently in stable-queue which might be from hch@xxxxxx are queue-5.12/nvme-loop-fix-memory-leak-in-nvme_loop_create_ctrl.patch queue-5.12/nvme-tcp-rerun-io_work-if-req_list-is-not-empty.patch queue-5.12/fs-mount_setattr-tighten-permission-checks.patch queue-5.12/nvme-tcp-fix-possible-use-after-completion.patch queue-5.12/nvme-multipath-fix-double-initialization-of-ana-state.patch queue-5.12/nvmet-fix-memory-leak-in-nvmet_alloc_ctrl.patch queue-5.12/nvme-fc-clear-q_live-at-beginning-of-association-tea.patch queue-5.12/nvmet-seset-ns-file-when-open-fails.patch