In the Linux kernel, the following vulnerability has been resolved:
drivers: staging: rtl8192bs: Fix deadlock in rtw_joinbss_event_prehandle()
There is a deadlock in rtw_joinbss_event_prehandle(), which is shown below:
(Thread 1) | (Thread 2) | _set_timer() rtw_joinbss_event_prehandle()| mod_timer() spin_lock_bh() //(1) | (wait a time) ... | _rtw_join_timeout_handler() del_timer_sync() | spin_lock_bh() //(2) (wait timer to stop) | ...
We hold pmlmepriv->lock in position (1) of thread 1 and use del_timer_sync() to wait timer to stop, but timer handler also need pmlmepriv->lock in position (2) of thread 2. As a result, rtw_joinbss_event_prehandle() will block forever.
This patch extracts del_timer_sync() from the protection of spin_lock_bh(), which could let timer handler to obtain the needed lock. What`s more, we change spin_lock_bh() to spin_lock_irq() in _rtw_join_timeout_handler() in order to prevent deadlock.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Feb 27, 2025 | Feb 27, 2025 |
| Ubuntu | — | Upgrade linux-hwe-5.15Upgrade linux-awsUpgrade linuxUpgrade linux-aws-5.15Upgrade linux-lowlatency-hwe-5.15Upgrade linux-lowlatencyUpgrade linux-intel-iotgUpgrade linux-realtimeUpgrade linux-azure-fdeUpgrade linux-azureUpgrade linux-nvidiaUpgrade linux-gkeopUpgrade linux-gkeUpgrade linux-gcpUpgrade linux-raspiUpgrade linux-azure-fde-5.15Upgrade linux-oracle-5.15Upgrade linux-kvmUpgrade linux-ibmUpgrade linux-intel-iotg-5.15Upgrade linux-gcp-5.15Upgrade linux-riscv-5.15Upgrade linux-oracleUpgrade linux-azure-5.15 | Mar 19, 2025 | Feb 26, 2025 |
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