linux-kernel - [PATCH] thunderbolt: Fix use-after-free in tb_dp_dprx

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Message-Id: <20250922051859.16095-1-duoming@zju.edu.cn>
Date: Mon, 22 Sep 2025 13:18:59 +0800
From: Duoming Zhou <duoming@....edu.cn>
To: linux-usb@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	YehezkelShB@...il.com,
	westeri@...nel.org,
	michael.jamet@...el.com,
	andreas.noever@...il.com,
	Duoming Zhou <duoming@....edu.cn>
Subject: [PATCH] thunderbolt: Fix use-after-free in tb_dp_dprx_work

The original code relies on cancel_delayed_work() in tb_dp_dprx_stop(),
which does not ensure that the delayed work item tunnel->dprx_work has
fully completed if it was already running. This leads to use-after-free
scenarios where tb_tunnel is deallocated by tb_tunnel_put(), while
tunnel->dprx_work remains active and attempts to dereference tb_tunnel
in tb_dp_dprx_work().

A typical race condition is illustrated below:

CPU 0                            | CPU 1
tb_dp_tunnel_active()            |
  tb_deactivate_and_free_tunnel()| tb_dp_dprx_start()
    tb_tunnel_deactivate()       |   queue_delayed_work()
      tb_dp_activate()           |
        tb_dp_dprx_stop()        | tb_dp_dprx_work() //delayed worker
          cancel_delayed_work()  |
    tb_tunnel_put(tunnel);       |
                                 |   tunnel = container_of(...); //UAF
                                 |   tunnel-> //UAF

Replacing cancel_delayed_work() with cancel_delayed_work_sync() is
not feasible as it would introduce a deadlock: both tb_dp_dprx_work()
and the cleanup path acquire tb->lock, and cancel_delayed_work_sync()
would wait indefinitely for the work item that cannot proceed.

Instead, implement proper reference counting:
- If cancel_delayed_work() returns true (work is pending), we release
  the reference in the stop function.
- If it returns false (work is executing or already completed), the
  reference is released in delayed work function itself.

This ensures the tb_tunnel remains valid during work item execution
while preventing memory leaks.

This bug was found by static analysis.

Fixes: d6d458d42e1e ("thunderbolt: Handle DisplayPort tunnel activation asynchronously")
Signed-off-by: Duoming Zhou <duoming@....edu.cn>
---
 drivers/thunderbolt/tunnel.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/thunderbolt/tunnel.c b/drivers/thunderbolt/tunnel.c
index d52efe3f658c..89fa0c626d3e 100644
--- a/drivers/thunderbolt/tunnel.c
+++ b/drivers/thunderbolt/tunnel.c
@@ -1073,6 +1073,7 @@ static void tb_dp_dprx_work(struct work_struct *work)
 
 	if (tunnel->callback)
 		tunnel->callback(tunnel, tunnel->callback_data);
+	tb_tunnel_put(tunnel);
 }
 
 static int tb_dp_dprx_start(struct tb_tunnel *tunnel)
@@ -1097,11 +1098,14 @@ static int tb_dp_dprx_start(struct tb_tunnel *tunnel)
 
 static void tb_dp_dprx_stop(struct tb_tunnel *tunnel)
 {
+	bool ret;
+
 	if (tunnel->dprx_started) {
 		tunnel->dprx_started = false;
 		tunnel->dprx_canceled = true;
-		cancel_delayed_work(&tunnel->dprx_work);
-		tb_tunnel_put(tunnel);
+		ret = cancel_delayed_work(&tunnel->dprx_work);
+		if (ret)
+			tb_tunnel_put(tunnel);
 	}
 }
 
-- 
2.34.1