CVE-2022-49311
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2022-49311
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-49311.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2022-49311
- Downstream
- Related
- Published
- 2025-02-26T07:01:07Z
- Modified
- 2025-08-09T20:01:27Z
- Severity
-
- 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- [none]
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
drivers: staging: rtl8192bs: Fix deadlock in rtwjoinbssevent_prehandle()
There is a deadlock in rtwjoinbssevent_prehandle(), which is shown below:
(Thread 1) | (Thread 2) | settimer() rtwjoinbsseventprehandle()| modtimer() spinlockbh() //(1) | (wait a time) ... | rtwjointimeouthandler() deltimersync() | spinlockbh() //(2) (wait timer to stop) | ...
We hold pmlmepriv->lock in position (1) of thread 1 and use deltimersync() to wait timer to stop, but timer handler also need pmlmepriv->lock in position (2) of thread 2. As a result, rtwjoinbssevent_prehandle() will block forever.
This patch extracts deltimersync() from the protection of spinlockbh(), which could let timer handler to obtain the needed lock. What`s more, we change spinlockbh() to spinlockirq() in rtwjointimeouthandler() in order to prevent deadlock.
- References