fix twos complement overflow bug in mem streams boundary check
authorRich Felker <dalias@aerifal.cx>
Sun, 4 Sep 2011 04:06:01 +0000 (00:06 -0400)
committerRich Felker <dalias@aerifal.cx>
Sun, 4 Sep 2011 04:06:01 +0000 (00:06 -0400)
commit32d67e938e8da0f37c59247acee8b10eaf9a113c
treee87b7b5da7700f8af18ce90ceef850398ba9947c
parentd4fa6f0e08ff5a292d2aeeeeda80670a1a082cae
fix twos complement overflow bug in mem streams boundary check

the expression -off is not safe in case off is the most-negative
value. instead apply - to base which is known to be non-negative and
bounded within sanity.
src/stdio/open_memstream.c
src/stdio/open_wmemstream.c