From e873c74132f0c5f1452816cd9bb26208f0bba1e1 Mon Sep 17 00:00:00 2001 From: Shivank Garg Date: Sat, 22 Aug 2026 19:22:05 +0000 Subject: dmaengine: fix use-after-free in dma_chan_put() and dma_release_channel() When dma_device_put() drops the last reference on chan->device->ref, dma_device_release() runs and may free the dma_device along with its channels. dma_chan_put() then still reads chan->device->owner via dma_chan_to_owner() for the trailing module_put(). KASAN catches it: slab-use-after-free in dma_chan_put+0x3e6/0x4c0 Read of size 8 by task insmod/6319 Freed by task 6319: kfree+0x225/0x470 dma_chan_put+0x395/0x4c0 dmaengine_put+0xf8/0x160 Cache the module owner in dma_chan_put() before the put so the trailing module_put() does not need chan->device. Fixes: 8ad342a86359 ("dmaengine: Add reference counting to dma_device struct") Suggested-by: Sashiko Link: https://sashiko.dev/#/patchset/20260518-dmaengine-kref-fix-v1-1-4d6125048fb7@amd.com Reviewed-by: Frank Li Reviewed-by: Logan Gunthorpe Signed-off-by: Shivank Garg Link: https://patch.msgid.link/20260822-dmaengine-kref-fix-v5-3-d4a4ee47d927@amd.com Signed-off-by: Vinod Koul --- fs/smb/server/server.h | 77 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 77 insertions(+) create mode 100644 fs/smb/server/server.h (limited to 'fs/smb/server/server.h') diff --git a/fs/smb/server/server.h b/fs/smb/server/server.h new file mode 100644 index 000000000..4d4d268b5 --- /dev/null +++ b/fs/smb/server/server.h @@ -0,0 +1,77 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2018 Samsung Electronics Co., Ltd. + */ + +#ifndef __SERVER_H__ +#define __SERVER_H__ + +#include "smbacl.h" + +/* + * Server state type + */ +enum { + SERVER_STATE_STARTING_UP, + SERVER_STATE_RUNNING, + SERVER_STATE_RESETTING, + SERVER_STATE_SHUTTING_DOWN, +}; + +/* + * Server global config string index + */ +enum { + SERVER_CONF_NETBIOS_NAME, + SERVER_CONF_SERVER_STRING, + SERVER_CONF_WORK_GROUP, +}; + +struct ksmbd_server_config { + unsigned int flags; + unsigned int state; + short signing; + short enforced_signing; + short min_protocol; + short max_protocol; + unsigned short tcp_port; + unsigned short ipc_timeout; + unsigned long ipc_last_active; + unsigned long deadtime; + unsigned int share_fake_fscaps; + struct smb_sid domain_sid; + unsigned int auth_mechs; + unsigned int max_connections; + unsigned int max_inflight_req; + unsigned int max_ip_connections; + + char *conf[SERVER_CONF_WORK_GROUP + 1]; + struct task_struct *dh_task; + bool bind_interfaces_only; + /* AAPL model string for Finder icon, e.g. "Xserve" */ + char aapl_model[32]; +}; + +extern struct ksmbd_server_config server_conf; + +int ksmbd_set_netbios_name(char *v); +int ksmbd_set_server_string(char *v); +int ksmbd_set_work_group(char *v); + +char *ksmbd_netbios_name(void); +char *ksmbd_server_string(void); +char *ksmbd_work_group(void); + +static inline int ksmbd_server_running(void) +{ + return READ_ONCE(server_conf.state) == SERVER_STATE_RUNNING; +} + +static inline int ksmbd_server_configurable(void) +{ + return READ_ONCE(server_conf.state) < SERVER_STATE_RESETTING; +} + +int server_queue_ctrl_init_work(void); +int server_queue_ctrl_reset_work(void); +#endif /* __SERVER_H__ */ -- cgit v1.3.1