[Bug regex/1245] New: regexec invokes alloca with unbounded size; plus alloca cleanup

["eggert at gnu dot org" <sourceware-bugzilla at sources dot redhat dot com>]

I noticed that regexec's set_regs functions invokes alloca with a potentially
unbounded size.  glibc code is supposed to check the size first with
__libc_use_alloca first.

While fixing this, I noticed a lot of ancient portability cruft for alloca,
intended for use outside glibc, that is no longer needed now that gnulib
supplies an alloca module.  This can be cleaned out now.

I'll attach a patch.

-- 
           Summary: regexec invokes alloca with unbounded size; plus alloca
                    cleanup
           Product: glibc
           Version: 2.3.5
            Status: NEW
          Severity: normal
          Priority: P2
         Component: regex
        AssignedTo: gotom at debian dot or dot jp
        ReportedBy: eggert at gnu dot org
                CC: glibc-bugs-regex at sources dot redhat dot com,glibc-
                    bugs at sources dot redhat dot com
 BugsThisDependsOn: 1241


http://sources.redhat.com/bugzilla/show_bug.cgi?id=1245

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