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Autoloaded &VERSION and UNIVERSAL::VERSION don't mix #454

p5pRT opened this issue Aug 29, 1999 · 1 comment

Autoloaded &VERSION and UNIVERSAL::VERSION don't mix #454

p5pRT opened this issue Aug 29, 1999 · 1 comment


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p5pRT commented Aug 29, 1999

Migrated from (status was 'resolved')

Searchable as RT1295$

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p5pRT commented Aug 29, 1999

From spider@Orb.Nashua.NH.US

Depending on memory allocation patterns, the use of UNIVERSAL​::VERSION
can cause a segfault if the target package has a stub declaration for
its &VERSION. This is because it's not checking that the value it
gets back from its hv_fetch is really a GV, and in the case of stub
declarations it's an IV or a PV.

This fixes that, and causes it to understand an undef GvSV as well as
an undef gv as being "(undef)".

Inline Patch
--- universal.c.DIST	Tue Jul 20 13:18:16 1999
+++ universal.c	Sun Aug 29 18:58:08 1999
@@ -197,7 +197,7 @@ XS(XS_UNIVERSAL_VERSION)
     gvp = pkg ? (GV**)hv_fetch(pkg,"VERSION",7,FALSE) : Null(GV**);
-    if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (sv = GvSV(gv))) {
+    if (gvp && isGV(gv = *gvp) && SvOK(sv = GvSV(gv))) {
         SV *nsv = sv_newmortal();
         sv_setsv(nsv, sv);
         sv = nsv;
Perl Info

Site configuration information for perl 5.00561:

Configured by spider at Fri Aug 27 06:56:26 EDT 1999.

Summary of my perl5 (revision 5.0 version 5 subversion 61) configuration:
    osname=dec_osf, osvers=4.0, archname=alpha-dec_osf
    uname='osf1 x4.0 834 alpha '
    config_args='-dsEO -Darchlib=/local/opt/perl/lib/5.00561/alpha-dec_osf -Dbin=/local/bin/exp -Dbinexp=/local/bin/exp -Dcc=cc -Dccflags=-std -I/usr/local/include -DDEBUGGING -DDEBUGGING_OPS -D_INTRINSICS -D_INLINE_INTRINSICS -Drand=__random -Dsrand=__srandom -DUSE_PERL_SBRK -DPERL_SBRK_VIA_MALLOC -DEMBEDMYMALLOC= -fprm d -ieee -Ud_bincompat3 -Ud_bincompat5005 -Dd_dosuid=define -Dinstallbin=/local/OSF1/alpha/bin/exp -Uinstallstyle= -Dlddlflags=-shared -msym -expect_unresolved "*" -g -std -Dldflags=-std -msym -g -Dlibswanted=sfio gdbm m -Dman1dir=/local/man/man1 -Dman1ext=1 -Dman3dir=/local/man/man3 -Dman3ext=3pl -Doptimize=-g -Dpager=/local/bin/less -Dprefix=/local/opt/perl -Dscriptdir=/local/share/exp -Dsitelib=/local/opt/perl/lib/site_perl/5.00561 -Dsitearch=/local/opt/perl/lib/site_perl/5.00561/alpha-dec_osf -Duseshrplib -Ud_safemcpy= -Ud_sfio= -Ui_dbm -Uinstallarchlib= -Uinstallprivlib= -Uinstallscript= -Uinstallsitearch= -Uinstallsitelib= -Uinstallusrbinperl -Ulibs= -Upe!
rlpath= -Uprivlib= -Urandbits= -Uusethreads -Dusemymalloc=y -e'
    hint=previous, useposix=true, d_sigaction=define
    usethreads=undef useperlio=undef d_sfio=undef
    use64bits=undef usemultiplicity=undef
    cc='cc', optimize='-g', gccversion=
    cppflags='-std -I/usr/local/include -DDEBUGGING -DDEBUGGING_OPS -D_INTRINSICS -D_INLINE_INTRINSICS -Drand=__random -Dsrand=__srandom -DUSE_PERL_SBRK -DPERL_SBRK_VIA_MALLOC -DEMBEDMYMALLOC= -ieee'
    ccflags ='-std -I/usr/local/include -DDEBUGGING -DDEBUGGING_OPS -D_INTRINSICS -D_INLINE_INTRINSICS -Drand=__random -Dsrand=__srandom -DUSE_PERL_SBRK -DPERL_SBRK_VIA_MALLOC -DEMBEDMYMALLOC= -fprm d -ieee'
    stdchar='unsigned char', d_stdstdio=define, usevfork=false
    intsize=4, longsize=8, ptrsize=8, doublesize=8
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=8
    alignbytes=8, usemymalloc=y, prototype=define
  Linker and Libraries:
    ld='ld', ldflags ='-std -msym -g -L/usr/local/lib'
    libpth=/usr/local/lib /usr/shlib /usr/ccs/lib /usr/lib/cmplrs/cc /usr/lib /var/shlib
    libs=-lgdbm -lm
    libc=/usr/shlib/, so=so, useshrplib=true,
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='  -Wl,-rpath,/local/opt/perl/lib/5.00561/alpha-dec_osf/CORE'
    cccdlflags=' ', lddlflags='-shared -msym -expect_unresolved "*" -g -std -L/usr/local/lib'

Locally applied patches:

@INC for perl 5.00561:

Environment for perl 5.00561:
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PERL_BADLANG (unset)

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