Bug 2348294 (CVE-2022-49273)

Summary: CVE-2022-49273 kernel: rtc: pl031: fix rtc features null pointer dereference
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the rtc-pl031 module in the Linux kernel. The alarm feature bit was cleaned before device initialization, which caused a NULL pointer dereference when there was no interrupt line. This resulted in a system crash and a denial of service.
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Description OSIDB Bzimport 2025-02-26 03:24:25 UTC 
In the Linux kernel, the following vulnerability has been resolved:

rtc: pl031: fix rtc features null pointer dereference

When there is no interrupt line, rtc alarm feature is disabled.

The clearing of the alarm feature bit was being done prior to allocations
of ldata->rtc device, resulting in a null pointer dereference.

Clear RTC_FEATURE_ALARM after the rtc device is allocated.
Comment 1 Avinash Hanwate 2025-02-26 19:47:04 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022630-CVE-2022-49273-61de@gregkh/T