sh: Don't add something to a null pointer
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Authored by jilles on Jan 23 2022, 9:28 PM.

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rG5a1a07f2a0e1: sh: Don't add something to a null pointer

Summary

Pointer arithmetic on a null pointer is undefined behavior.

The bug can be reproduced by running bin/sh/tests/builtins/wait6.0 with
UBSAN.

Test Plan

kyua test

Diff Detail

Repository

rG FreeBSD src repository

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Lint Not Applicable

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Tests Not Applicable

Event Timeline

jilles created this revision.Jan 23 2022, 9:28 PM

Herald added a subscriber: imp. · View Herald TranscriptJan 23 2022, 9:28 PM

jilles requested review of this revision.Jan 23 2022, 9:28 PM

imp accepted this revision.Jan 24 2022, 12:00 AM

This revision is now accepted and ready to land.Jan 24 2022, 12:00 AM

Closed by commit rG5a1a07f2a0e1: sh: Don't add something to a null pointer (authored by jilles). · Explain WhyJan 26 2022, 10:18 PM

This revision was automatically updated to reflect the committed changes.

jilles added a commit: rG5a1a07f2a0e1: sh: Don't add something to a null pointer.

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bin/

sh/

jobs.c

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Diff 101965

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sh: Don't add something to a null pointerClosedPublicActions