scmi: Avoid a use-after-free
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Authored by andrew on Jun 9 2025, 3:47 PM.

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cristian.marussi_arm.com
emaste

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arm64

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rGd41a2ba73cbe: scmi: Avoid a use-after-free

Summary

Use LIST_FOREACH_SAFE to avoid a use-after-free in scmi_reqs_pool_free.
The next pointer will be invalid after the call to free meaning
LIST_FOREACH will dereference a freed struct to move to the next item.

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rG FreeBSD src repository

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Buildable 64721
Build 61605: arc lint + arc unit

Event Timeline

andrew created this revision.Jun 9 2025, 3:47 PM

Herald added a subscriber: imp. · View Herald TranscriptJun 9 2025, 3:47 PM

andrew requested review of this revision.Jun 9 2025, 3:47 PM

Harbormaster completed remote builds in B64721: Diff 156714.Jun 9 2025, 3:47 PM

LGTM with two little notes:

Commit message cut off

The next pointer will be invalid when

Also it seems we generally have unique names for the field and tvar (I spotted one existing duplicate case, in uath_txfrag_setup)

andrew edited the summary of this revision. (Show Details)Jun 10 2025, 2:13 PM

Make the temp var unique

Harbormaster completed remote builds in B64746: Diff 156787.Jun 10 2025, 2:14 PM

emaste accepted this revision as: emaste.Jun 10 2025, 4:48 PM

This revision is now accepted and ready to land.Jun 10 2025, 4:48 PM

Closed by commit rGd41a2ba73cbe: scmi: Avoid a use-after-free (authored by andrew). · Explain WhyJun 11 2025, 9:35 AM

This revision was automatically updated to reflect the committed changes.

andrew added a commit: rGd41a2ba73cbe: scmi: Avoid a use-after-free.

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sys/

dev/

firmware/

arm/

scmi.c

4 lines

Diff 156714

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sys/dev/firmware/arm/scmi.c

scmi: Avoid a use-after-freeClosedPublicActions