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[bug #63609] Fix a buffer overrun in warn_undefined.

From: Dmitry Goncharov
Subject: [bug #63609] Fix a buffer overrun in warn_undefined.
Date: Tue, 3 Jan 2023 00:23:01 -0500 (EST)

Follow-up Comment #1, bug #63609 (project make):

The following code in warn_undefined causes a buffer overrun

if (memcmp (*cp, name, len) == 0 && (*cp)[len] == '\0')

when len exceeds strlen (*cp). This happens when make needs to expand a
variable whos name is longer than *cp,


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