support: Close original descriptors in support_capture_subprocess

(cherry picked from commit 02cd5c1a8d033d7f91fea12a66bb44d1bbf85f76)

2 files changed, 12 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index a979f53811..2951523334 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2018-12-01  Florian Weimer  <fweimer@redhat.com>
+
+	* support/support_capture_subprocess.c
+	(support_capture_subprocess): Check that pipe descriptors have
+	expected values.  Close original pipe descriptors in subprocess.
+
 2018-11-28  Florian Weimer  <fweimer@redhat.com>
 
 	* support/support.h (support_quote_string): Do not use str
diff --git a/support/support_capture_subprocess.c b/support/support_capture_subprocess.c
index 6d2029e13b..93f6ea3102 100644
--- a/support/support_capture_subprocess.c
+++ b/support/support_capture_subprocess.c
@@ -59,8 +59,12 @@ support_capture_subprocess (void (*callback) (void *), void *closure)
 
   int stdout_pipe[2];
   xpipe (stdout_pipe);
+  TEST_VERIFY (stdout_pipe[0] > STDERR_FILENO);
+  TEST_VERIFY (stdout_pipe[1] > STDERR_FILENO);
   int stderr_pipe[2];
   xpipe (stderr_pipe);
+  TEST_VERIFY (stderr_pipe[0] > STDERR_FILENO);
+  TEST_VERIFY (stderr_pipe[1] > STDERR_FILENO);
 
   TEST_VERIFY (fflush (stdout) == 0);
   TEST_VERIFY (fflush (stderr) == 0);
@@ -72,6 +76,8 @@ support_capture_subprocess (void (*callback) (void *), void *closure)
       xclose (stderr_pipe[0]);
       xdup2 (stdout_pipe[1], STDOUT_FILENO);
       xdup2 (stderr_pipe[1], STDERR_FILENO);
+      xclose (stdout_pipe[1]);
+      xclose (stderr_pipe[1]);
       callback (closure);
       _exit (0);
     }