CVE-2022-49311 (GCVE-0-2022-49311)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:10 – Updated: 2026-05-11 18:57
VLAI?
Title
drivers: staging: rtl8192bs: Fix deadlock in rtw_joinbss_event_prehandle()
Summary
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.
Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 554c0a3abf216c991c5ebddcdb2c08689ecd290b , < ae60744d5fad840b9d056d35b4b652d95e755846 (git)
Affected: 554c0a3abf216c991c5ebddcdb2c08689ecd290b , < 1f6c99b94ca3caad346876b3e22e3ca3d25bc8ee (git)
Affected: 554c0a3abf216c991c5ebddcdb2c08689ecd290b , < eca9748d9267a38d532464e3305a38629e9c35a9 (git)
Affected: 554c0a3abf216c991c5ebddcdb2c08689ecd290b , < 041879b12ddb0c6c83ed9c0bdd10dc82a056f2fc (git)
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    Linux Linux Affected: 4.12
Unaffected: 0 , < 4.12 (semver)
Unaffected: 5.15.47 , ≤ 5.15.* (semver)
Unaffected: 5.17.15 , ≤ 5.17.* (semver)
Unaffected: 5.18.4 , ≤ 5.18.* (semver)
Unaffected: 5.19 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrivers: staging: rtl8192bs: Fix deadlock in rtw_joinbss_event_prehandle()\n\nThere is a deadlock in rtw_joinbss_event_prehandle(), which is shown\nbelow:\n\n   (Thread 1)                |      (Thread 2)\n                             | _set_timer()\nrtw_joinbss_event_prehandle()|  mod_timer()\n spin_lock_bh() //(1)        |  (wait a time)\n ...                         | _rtw_join_timeout_handler()\n del_timer_sync()            |  spin_lock_bh() //(2)\n (wait timer to stop)        |  ...\n\nWe hold pmlmepriv-\u003elock in position (1) of thread 1 and\nuse del_timer_sync() to wait timer to stop, but timer handler\nalso need pmlmepriv-\u003elock in position (2) of thread 2.\nAs a result, rtw_joinbss_event_prehandle() will block forever.\n\nThis patch extracts del_timer_sync() from the protection of\nspin_lock_bh(), which could let timer handler to obtain\nthe needed lock. What`s more, we change spin_lock_bh() to\nspin_lock_irq() in _rtw_join_timeout_handler() in order to\nprevent deadlock."
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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