[PW_SID:1076861] [v2,1/1] Bluetooth: serialize accept_q access

[BluezTestBot]

From: Jiexun Wang wangjiexun2025@gmail.com

bt_sock_poll() walks the accept queue without synchronization, while
child teardown can unlink the same socket and drop its last reference.

Protect accept_q with a dedicated lock for queue updates and polling.
Also rework bt_accept_dequeue() to take temporary child references under
the queue lock before dropping it and locking the child socket.

Fixes: 1da177e ("Linux-2.6.12-rc2")
Reported-by: Yifan Wu yifanwucs@gmail.com
Reported-by: Juefei Pu tomapufckgml@gmail.com
Co-developed-by: Yuan Tan yuantan098@gmail.com
Signed-off-by: Yuan Tan yuantan098@gmail.com
Suggested-by: Xin Liu bird@lzu.edu.cn
Tested-by: Ren Wei enjou1224z@gmail.com
Signed-off-by: Jiexun Wang wangjiexun2025@gmail.com
Signed-off-by: Ren Wei n05ec@lzu.edu.cn

Changes in v2:

• add Tested-by: Ren Wei enjou1224z@gmail.com
• resend to the public Bluetooth/netdev lists

include/net/bluetooth/bluetooth.h | 1 +
net/bluetooth/af_bluetooth.c | 85 +++++++++++++++++++++++--------
2 files changed, 66 insertions(+), 20 deletions(-)

[github-actions]

CheckPatch
Desc: Run checkpatch.pl script
Duration: 0.31 seconds
Result: PENDING

[github-actions]

GitLint
Desc: Run gitlint
Duration: 0.26 seconds
Result: PENDING

[github-actions]

SubjectPrefix
Desc: Check subject contains "Bluetooth" prefix
Duration: 0.12 seconds
Result: PASS

[github-actions]

BuildKernel
Desc: Build Kernel for Bluetooth
Duration: 25.60 seconds
Result: PASS

[github-actions]

CheckAllWarning
Desc: Run linux kernel with all warning enabled
Duration: 28.35 seconds
Result: PASS

[github-actions]

CheckSparse
Desc: Run sparse tool with linux kernel
Duration: 27.45 seconds
Result: PASS

[github-actions]

BuildKernel32
Desc: Build 32bit Kernel for Bluetooth
Duration: 25.56 seconds
Result: PASS

[github-actions]

TestRunnerSetup
Desc: Setup kernel and bluez for test-runner
Duration: 566.41 seconds
Result: PASS

[github-actions]

TestRunner_l2cap-tester
Desc: Run l2cap-tester with test-runner
Duration: 28.80 seconds
Result: PASS

[github-actions]

TestRunner_iso-tester
Desc: Run iso-tester with test-runner
Duration: 34.40 seconds
Result: PASS

[github-actions]

TestRunner_bnep-tester
Desc: Run bnep-tester with test-runner
Duration: 6.45 seconds
Result: PASS

[github-actions]

TestRunner_mgmt-tester
Desc: Run mgmt-tester with test-runner
Duration: 115.61 seconds
Result: FAIL
Output:

Total: 494, Passed: 489 (99.0%), Failed: 1, Not Run: 4

Failed Test Cases
Read Exp Feature - Success                           Failed       0.111 seconds

[github-actions]

TestRunner_rfcomm-tester
Desc: Run rfcomm-tester with test-runner
Duration: 10.75 seconds
Result: PASS

[github-actions]

TestRunner_sco-tester
Desc: Run sco-tester with test-runner
Duration: 14.63 seconds
Result: FAIL
Output:

WARNING: possible circular locking dependency detected
BUG: sleeping function called from invalid context at net/core/sock.c:3782
Total: 30, Passed: 30 (100.0%), Failed: 0, Not Run: 0

[github-actions]

TestRunner_ioctl-tester
Desc: Run ioctl-tester with test-runner
Duration: 10.42 seconds
Result: PASS

[github-actions]

TestRunner_mesh-tester
Desc: Run mesh-tester with test-runner
Duration: 12.47 seconds
Result: FAIL
Output:

Total: 10, Passed: 8 (80.0%), Failed: 2, Not Run: 0

Failed Test Cases
Mesh - Send cancel - 1                               Timed out    2.703 seconds
Mesh - Send cancel - 2                               Timed out    1.994 seconds

[github-actions]

TestRunner_smp-tester
Desc: Run smp-tester with test-runner
Duration: 8.86 seconds
Result: PASS

[github-actions]

TestRunner_userchan-tester
Desc: Run userchan-tester with test-runner
Duration: 6.87 seconds
Result: PASS

[github-actions]

IncrementalBuild
Desc: Incremental build with the patches in the series
Duration: 0.51 seconds
Result: PENDING