CVE-2022-49311

published 2025-02-26

CVE-2022-49311: In the Linux kernel, the following vulnerability has been resolved: drivers: staging: rtl8192bs: Fix deadlock in rtw_joinbss_event_prehandle() There is a…

Priority P4 19 medium 5.5 CVSS 3.1

AV L AC L PR L UI N S U C N I N A H

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.

Affected

12 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 5.18.5-1 (bookworm)	linux 5.18.5-1 (bookworm)
linux	linux	—	—
linux	linux	>= 554c0a3abf216c991c5ebddcdb2c08689ecd290b < ae60744d5fad840b9d056d35b4b652d95e755846	ae60744d5fad840b9d056d35b4b652d95e755846
linux	linux	>= 554c0a3abf216c991c5ebddcdb2c08689ecd290b < 1f6c99b94ca3caad346876b3e22e3ca3d25bc8ee	1f6c99b94ca3caad346876b3e22e3ca3d25bc8ee
linux	linux	>= 554c0a3abf216c991c5ebddcdb2c08689ecd290b < eca9748d9267a38d532464e3305a38629e9c35a9	eca9748d9267a38d532464e3305a38629e9c35a9
linux	linux	>= 554c0a3abf216c991c5ebddcdb2c08689ecd290b < 041879b12ddb0c6c83ed9c0bdd10dc82a056f2fc	041879b12ddb0c6c83ed9c0bdd10dc82a056f2fc
linux	linux_kernel	< 5.15.47	5.15.47
linux	linux_kernel	>= 0 < 5.18.5-1	5.18.5-1
linux	linux_kernel	>= 0 < 5.18.5-1	5.18.5-1
linux	linux_kernel	>= 0 < 5.18.5-1	5.18.5-1
linux	linux_kernel	>= 5.16 < 5.17.15	5.17.15
linux	linux_kernel	>= 5.18 < 5.18.4	5.18.4

CVSS provenance

nvd v3.1 5.5 MEDIUM CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv 5.5 MEDIUM

vendor_debian 5.5 MEDIUM

vendor_redhat 5.5 MEDIUM

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