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Differential D57324

fts: Check link count before using it
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Authored by des on May 29 2026, 1:24 PM.

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rGe4dd3505c2d1: fts: Check link count before using it
rGb2b95249ae0e: fts: Check link count before using it

Summary

Check the range of the link count before trying to use it.

Rewrite the comment explaining what the link count is used for.

MFC after: 1 week
Sponsored by: Klara, Inc.

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rG FreeBSD src repository

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Build Status

Buildable 73544
Build 70427: arc lint + arc unit

Event Timeline

des created this revision.May 29 2026, 1:24 PM

Herald added a subscriber: imp. · View Herald TranscriptMay 29 2026, 1:24 PM

des requested review of this revision.May 29 2026, 1:24 PM

Harbormaster completed remote builds in B73540: Diff 178890.May 29 2026, 1:24 PM

kevans added a subscriber: kevans.May 29 2026, 2:16 PM

kevans added inline comments.

lib/libc/gen/fts.c
739	Pre-existing issue and a little pedantic, but this should probably at least be `long long` on FreeBSD to be correct for the remaining 32-bit arch we have? `__nlink_t` is unconditionally a `uint64_t`, so we have some range of values that might misbehave in presumably pathological cases. I probably would've gone with `nlink_t` and special-cased `(nlink_t)-1`, though. Losing one potential valid value for a link count seems fine, especially in light of your note that `NLINK_MAX` might be a truncated value anyways and we have to be conservative with it.

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des marked an inline comment as done.May 29 2026, 2:36 PM

Harbormaster completed remote builds in B73544: Diff 178895.May 29 2026, 2:36 PM

I can dig it

This revision is now accepted and ready to land.May 29 2026, 2:51 PM

Closed by commit rGb2b95249ae0e: fts: Check link count before using it (authored by des). · Explain WhyMay 29 2026, 5:45 PM

This revision was automatically updated to reflect the committed changes.

des added a commit: rGb2b95249ae0e: fts: Check link count before using it.

des added a commit: rGe4dd3505c2d1: fts: Check link count before using it.Jun 4 2026, 2:41 PM

des mentioned this in D57461: (RFC) stdio: consolidate the two memstream implementations.Jun 5 2026, 4:37 PM

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lib/

libc/

gen/

44 lines

Diff 178895

lib/libc/gen/fts.c

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