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msdosfs: handle a case when non-dot lookup returned dvp

Description

msdosfs: handle a case when non-dot lookup returned dvp

This means that filesystem is corrupted, there is a loop.

In collaboration with: pho
Reviewed by: markj, mckusick
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D33721

Details

Provenance
kibAuthored on Dec 28 2021, 1:41 PM
Reviewer
markj
Differential Revision
D33721: Improve msdosfs robustness
Parents
rG2c9a1c22c323: msdosfs: take inusemap inconsistency as an error, not invariants violation
Branches
Unknown
Tags
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