CVS commit: src/usr.bin/make

["Roland Illig" <rillig%netbsd.org@localhost>]

Module Name:    src
Committed By:   rillig
Date:           Sun Oct  4 11:58:57 UTC 2020

Modified Files:
        src/usr.bin/make: parse.c

Log Message:
make(1): fix out-of-bounds memory access in Parse_DoVar

When a line starts with "=value", this is interpreted as a variable
assignment, with an empty variable name.  In that case, there is no
"previous character" from the '='.  Accessing that character therefore
was an out-of-bounds read access.

If a whole file starts with "=value", instead of just a single line,
this out-of-bounds access can actually lead to a segmentation fault.
This depends on the memory allocator though.


To generate a diff of this commit:
cvs rdiff -u -r1.350 -r1.351 src/usr.bin/make/parse.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.