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vfs: Fix error handling in vn_fullpath_hardlink()
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Authored by markj on May 10 2021, 8:35 PM.

Details

Summary

vn_fullpath_any_smr() will return a positive error number if the
caller-supplied buffer isn't big enough. In this case the error must be
propagated up, otherwise we may copy out uninitialized bytes.

Reported by: syzkaller+KMSAN

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rG FreeBSD src repository
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