From 4310c6b8e75d6a47f7548e5948fbe6318aa4440a Mon Sep 17 00:00:00 2001 From: Fedor Pchelkin Date: Mon, 31 Aug 2026 10:58:09 +0300 Subject: thunderbolt: Fix NULL dereference in tb_remove_work() There is a slight race between tb_remove_work() and tb_domain_remove() which leads to dereferencing a NULL tb->root_switch pointer inside tb_free_unplugged_xdomains(): Thread A Thread B tb_remove_work() tb_domain_remove() mutex_lock(&tb->lock) tb_stop() /* doesn't cancel a running callback */ cancel_delayed_work(&tcm->remove_work) ... tb_switch_remove(tb->root_switch) tb->root_switch = NULL mutex_unlock(&tb->lock) mutex_lock(&tb->lock) ... /* without checking ->root_switch */ tb_free_unplugged_xdomains(tb->root_switch) mutex_unlock(&tb->lock) Commit a8937f35cf39 ("thunderbolt: Remove XDomain from the bus without holding tb->lock") doesn't seem right to move tb_free_unplugged_xdomains() out of the &tb->lock section and the check for tb->root_switch, in particular. It states: For this reason separate removing the XDomain from the topology data structures (where we need the lock) from unregistering the device from the bus (where remove callbacks of the drivers are being called). tb_free_unplugged_xdomains() belongs to the former group of functions requiring the lock. And it also calls tb_xdomain_remove() which should only be called with &tb->lock held. Found by Linux Verification Center (linuxtesting.org) with Svace static analysis tool. Fixes: a8937f35cf39 ("thunderbolt: Remove XDomain from the bus without holding tb->lock") Cc: stable@vger.kernel.org Signed-off-by: Fedor Pchelkin Signed-off-by: Mika Westerberg --- tools/lib/subcmd/exec-cmd.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) create mode 100644 tools/lib/subcmd/exec-cmd.h (limited to 'tools/lib/subcmd/exec-cmd.h') diff --git a/tools/lib/subcmd/exec-cmd.h b/tools/lib/subcmd/exec-cmd.h new file mode 100644 index 000000000..aba591b8d --- /dev/null +++ b/tools/lib/subcmd/exec-cmd.h @@ -0,0 +1,17 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __SUBCMD_EXEC_CMD_H +#define __SUBCMD_EXEC_CMD_H + +extern void exec_cmd_init(const char *exec_name, const char *prefix, + const char *exec_path, const char *exec_path_env); + +extern void set_argv_exec_path(const char *exec_path); +extern const char *extract_argv0_path(const char *path); +extern void setup_path(void); +extern int execv_cmd(const char **argv); /* NULL terminated */ +extern int execl_cmd(const char *cmd, ...); +/* get_argv_exec_path and system_path return malloc'd string, caller must free it */ +extern char *get_argv_exec_path(void); +extern char *system_path(const char *path); + +#endif /* __SUBCMD_EXEC_CMD_H */ -- cgit v1.3.1