https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193447
Bug ID: 193447
Summary: strvisx: Handle zero-length input strings gracefully.
Product: Base System
Version: 11.0-CURRENT
Hardware: Any
OS: Any
Status: Needs Triage
Severity: Affects Only Me
Priority: ---
Component: bin
Assignee: freebsd-bugs@FreeBSD.org
Reporter: conrad.me...@isilon.com
Created attachment 147037
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=147037&action=edit
patch -p0 against CURRENT.
The internal istrsenvisx() routine overloaded the zero length value as a
sentinel for "use strlen(3)." This is bad because the zero-length source string
has a defined behavior and the pointer for a zero-length string may be
completely bogus. Calling strlen(3) on a bogus pointer is bad.
Instead, use ssize_t for the input string length and use a #defined constant
MB_STRZ == (-1) as the sentinel for the nul-terminated strvis variants (strvis,
etc).
Sponsored by: EMC / Isilon storage division
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