dup2 fds can be bad.

Coverity CID 104812.

diff --git a/ext/POSIX/POSIX.xs b/ext/POSIX/POSIX.xs
index ce4c12c..bd13d52 100644 (file)
--- a/ext/POSIX/POSIX.xs
+++ b/ext/POSIX/POSIX.xs
@@ -3193,14 +3193,20 @@ dup2(fd1, fd2)
        int             fd1
        int             fd2
     CODE:
+       if (fd1 >= 0 && fd2 >= 0) {
 #ifdef WIN32
-       /* RT #98912 - More Microsoft muppetry - failing to actually implemented
-          the well known documented POSIX behaviour for a POSIX API.
-          http://msdn.microsoft.com/en-us/library/8syseb29.aspx   */
-       RETVAL = dup2(fd1, fd2) == -1 ? -1 : fd2;
+            /* RT #98912 - More Microsoft muppetry - failing to
+               actually implemented the well known documented POSIX
+               behaviour for a POSIX API.
+               http://msdn.microsoft.com/en-us/library/8syseb29.aspx  */
+            RETVAL = dup2(fd1, fd2) == -1 ? -1 : fd2;
 #else
-       RETVAL = dup2(fd1, fd2);
+            RETVAL = dup2(fd1, fd2);
 #endif
+        } else {
+            SETERRNO(EBADF,RMS_IFI);
+            RETVAL = -1;
+        }
     OUTPUT:
        RETVAL