Page MenuHomeFreeBSD

hwpmc_x86: Fix NULL deref when loading on unsupported hardware
ClosedPublic

Authored by bnovkov on Dec 21 2024, 11:19 AM.
Tags
None
Referenced Files
Unknown Object (File)
Fri, Mar 21, 5:51 AM
Unknown Object (File)
Sat, Mar 15, 4:40 PM
Unknown Object (File)
Feb 22 2025, 7:01 PM
Unknown Object (File)
Feb 22 2025, 9:02 AM
Unknown Object (File)
Feb 12 2025, 11:08 PM
Unknown Object (File)
Jan 25 2025, 6:26 AM
Unknown Object (File)
Jan 25 2025, 6:03 AM
Unknown Object (File)
Jan 24 2025, 9:56 PM
Subscribers

Details

Summary

The pmc_md_{intialize, finalize} routines rely on a machine-dependent
structure to register the appropriate PMC interrupt handler. However,
the vendor-specific routines that allocate this structure may return
NULL for unsupported hardware, leading to a panic when the hwpmc module
gets loaded. This patch adds additional checks that fix this issue.

Diff Detail

Repository
rG FreeBSD src repository
Lint
Lint Skipped
Unit
Tests Skipped