From 8ce8ccc2a22798a89bac06a37427c3a3cea91a62 Mon Sep 17 00:00:00 2001
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Date: Tue, 5 May 2020 16:35:54 +0100
Subject: [PATCH 3/9] tools/virtiofsd/passthrough_ll: Fix double close()
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RH-Author: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-id: <20200505163600.22956-2-dgilbert@redhat.com>
Patchwork-id: 96269
O-Subject: [RHEL-AV-8.2.1 qemu-kvm PATCH 1/7] tools/virtiofsd/passthrough_ll: Fix double close()
Bugzilla: 1817445
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
RH-Acked-by: Max Reitz <mreitz@redhat.com>
RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
RH-Acked-by: Michael S. Tsirkin <mst@redhat.com>

From: Philippe Mathieu-Daudé <philmd@redhat.com>

On success, the fdopendir() call closes fd. Later on the error
path we try to close an already-closed fd. This can lead to
use-after-free. Fix by only closing the fd if the fdopendir()
call failed.

Cc: qemu-stable@nongnu.org
Fixes: b39bce121b (add dirp_map to hide lo_dirp pointers)
Reported-by: Coverity (CID 1421933 USE_AFTER_FREE)
Suggested-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200321120654.7985-1-philmd@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
(cherry picked from commit e1cd92d95cd4f97b3464c4e08cd5b22bf5ca05cb)
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
---
 tools/virtiofsd/passthrough_ll.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough_ll.c
index 9cba3f1..50ff672 100644
--- a/tools/virtiofsd/passthrough_ll.c
+++ b/tools/virtiofsd/passthrough_ll.c
@@ -1524,8 +1524,7 @@ out_err:
     if (d) {
         if (d->dp) {
             closedir(d->dp);
-        }
-        if (fd != -1) {
+        } else if (fd != -1) {
             close(fd);
         }
         free(d);
-- 
1.8.3.1

