devfs: Avoid comparison with an uninitialized var in devfs_fp_check()
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Authored by markj on May 1 2021, 2:19 PM.

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rG243b324f9668: devfs: Avoid comparison with an uninitialized var in devfs_fp_check()

Summary

devvn_refthread() will initialize *devp only if it suceeds, so check for
success before comparing with fp->f_data. Other devfs_fp_check()
callers are careful to do this.

Reported by: KMSAN

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rG FreeBSD src repository

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Event Timeline

markj created this revision.May 1 2021, 2:19 PM

Herald added a subscriber: imp. · View Herald TranscriptMay 1 2021, 2:19 PM

markj requested review of this revision.May 1 2021, 2:19 PM

Harbormaster completed remote builds in B38954: Diff 88470.May 1 2021, 2:19 PM

markj added a reviewer: kib.May 1 2021, 2:19 PM

You mean, '... other devvn_refthread() callers are careful ...'

This revision is now accepted and ready to land.May 1 2021, 3:04 PM

Closed by commit rG243b324f9668: devfs: Avoid comparison with an uninitialized var in devfs_fp_check() (authored by markj). · Explain WhyMay 3 2021, 5:56 PM

This revision was automatically updated to reflect the committed changes.

markj added a commit: rG243b324f9668: devfs: Avoid comparison with an uninitialized var in devfs_fp_check().

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sys/

fs/

devfs/

devfs_vnops.c

3 lines

Diff 88564

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sys/fs/devfs/devfs_vnops.c

devfs: Avoid comparison with an uninitialized var in devfs_fp_check()ClosedPublicActions