Update from Gnulib

This incorporates:
2019-11-24 Fix errors in C++ mode on mingw
2019-11-24 time_r: Fix for mingw (regression from 2019-11-16)
2019-11-24 sys_time: Fix errors in C++ mode on mingw
2019-11-22 intprops: INT_MULTIPLY_WRAPV speedup for GCC 8.4+
2019-11-21 Disable many _GL_CXXALIASWARN on non-glibc
2019-11-21 Fix various errors in _GL_CXXALIAS_SYS invocations
2019-11-19 intprops: INT_MULTIPLY_WRAPV speedup for GCC 9.3+
2019-11-18 stdint: Define [u]intptr_t correctly on 64-bit native Windows
2019-11-18 stdint: Fix value of WINT_MAX when we override wint_t
2019-11-18 stdint: Avoid "conflicting types" error on mingw 5.22
2019-11-16 time_r: Fix for mingw
2019-11-06 regex: now back in sync with glibc
* lib/intprops.h, lib/regexec.c, lib/signal.in.h:
* lib/stdint.in.h, lib/stdio.in.h, lib/stdlib.in.h:
* lib/string.in.h, lib/sys_select.in.h, lib/sys_time.in.h:
* lib/time.in.h, lib/unistd.in.h, m4/time_r.m4:
Copy from Gnulib.

1 files changed, 5 insertions, 2 deletions

diff --git a/lib/regexec.c b/lib/regexec.c
index c5dc6220b2d..03a6b65047e 100644
--- a/lib/regexec.c
+++ b/lib/regexec.c
@@ -1266,10 +1266,13 @@ proceed_next_node (const re_match_context_t *mctx, Idx nregs, regmatch_t *regs,
       if (type == OP_BACK_REF)
         {
           Idx subexp_idx = dfa->nodes[node].opr.idx + 1;
-          naccepted = regs[subexp_idx].rm_eo - regs[subexp_idx].rm_so;
+          if (subexp_idx < nregs)
+            naccepted = regs[subexp_idx].rm_eo - regs[subexp_idx].rm_so;
           if (fs != NULL)
             {
-              if (regs[subexp_idx].rm_so == -1 || regs[subexp_idx].rm_eo == -1)
+              if (subexp_idx >= nregs
+                  || regs[subexp_idx].rm_so == -1
+                  || regs[subexp_idx].rm_eo == -1)
                 return -1;
               else if (naccepted)
                 {