[PATCH] qemu-nbd: Close inherited stderr

[Raphael Pour <raphael.pour@hetzner.com>]

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Hello,

after e6df58a5, the inherited stderr 'old_stderr' won't get closed
anymore if 'fork_process' is false. This causes other processes relying
on EOF to infinitely block or crash.

From 47ab9b517038d13117876a8bb3ef45c53d7f2f9e Mon Sep 17 00:00:00 2001
From: "Raphael Pour" <raphael.pour@hetzner.com>
Date: Tue, 12 May 2020 10:18:44 +0200
Subject: [PATCH] qemu-nbd: Close inherited stderr

Close inherited stderr of the parent if fork_process is false.
Otherwise no one will close it. (introduced by e6df58a5)

Signed-off-by: Raphael Pour <raphael.pour@hetzner.com>
---
 qemu-nbd.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/qemu-nbd.c b/qemu-nbd.c
index 108a51f7e..f2981e18a 100644
--- a/qemu-nbd.c
+++ b/qemu-nbd.c
@@ -1032,8 +1032,15 @@ int main(int argc, char **argv)
                 exit(EXIT_FAILURE);
             }

-            /* ... close the descriptor we inherited and go on.  */
+            /* ... close the descriptor we inherited and ...  */
             close(stderr_fd[1]);
+
+            /* ... also close the old_stderr IF fork_process is false
otherwise
+             * it will never get closed.
+             */
+            if (!fork_process) {
+              close(old_stderr);
+            }
         } else {
             bool errors = false;
             char *buf;
-- 
2.25.4


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