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hwpmc_x86: Fix NULL deref when loading on unsupported hardware
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Authored by bnovkov on Dec 21 2024, 11:19 AM.
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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.

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rG FreeBSD src repository
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