* pinfo.cc (commune_process): Fix randomly invalid pointer which caused fifos

to work incorrectly.

1 files changed, 8 insertions, 4 deletions

diff --git a/winsup/cygwin/sigproc.cc b/winsup/cygwin/sigproc.cc
index a82e90002..55fbb636d 100644
--- a/winsup/cygwin/sigproc.cc
+++ b/winsup/cygwin/sigproc.cc
@@ -679,10 +679,14 @@ sig_send (_pinfo *p, siginfo_t& si, _cygtls *tls)
   else
     {
       size_t n = strlen (si._si_commune._si_str);
-      char *p = leader = (char *) alloca (sizeof (pack) + sizeof (n) + n);
-      memcpy (p, &pack, sizeof (pack)); p += sizeof (pack);
-      memcpy (p, &n, sizeof (n)); p += sizeof (n);
-      memcpy (p, si._si_commune._si_str, n); p += n;
+      char *p = leader = (char *) alloca (sizeof (pack) + sizeof (n) + n /*DELETEME*/ + 1);
+      memcpy (p, &pack, sizeof (pack));
+      p += sizeof (pack);
+      memcpy (p, &n, sizeof (n));
+      p += sizeof (n);
+      memcpy (p, si._si_commune._si_str, n);
+p[n] = '\0'; sigproc_printf ("n %d, si_str %s", n, p);
+      p += n;
       packsize = p - leader;
     }