Re: [perl #24225] [5.8.1] segfault in binmode STDOUT, ':stdio'; print 1

Message-ID: <871xt9te7g.fsf@vran.herceg.de>

p4raw-id: //depot/perl@21505

1 files changed, 4 insertions, 2 deletions

diff --git a/perlio.c b/perlio.c
index faa3b19369..c4a81afd7c 100644
--- a/perlio.c
+++ b/perlio.c
@@ -2613,8 +2613,10 @@ char *
 PerlIOStdio_mode(const char *mode, char *tmode)
 {
     char *ret = tmode;
-    while (*mode) {
-	*tmode++ = *mode++;
+    if (mode) {
+	while (*mode) {
+	    *tmode++ = *mode++;
+	}
     }
 #if defined(PERLIO_USING_CRLF) || defined(__CYGWIN__)
     *tmode++ = 'b';