slirp: fork_exec(): Don't close() a negative number in fork_exec()

In a fork_exec() error path we try to closesocket(s) when s might
be a negative number because the thing that failed was the
qemu_socket() call. Add a guard so we don't do this.

(Spotted by Coverity: CID 1005727 issue 1 of 2.)

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/misc.c b/misc.c
index c72b4b2..0edb993 100644
--- a/misc.c
+++ b/misc.c
@@ -107,7 +107,9 @@ int fork_exec(struct socket *so, const char *ex, int do_pty)
             bind(s, (struct sockaddr *)&addr, addrlen) < 0 ||
             listen(s, 1) < 0) {
             error_report("Error: inet socket: %s", strerror(errno));
-            closesocket(s);
+            if (s >= 0) {
+                closesocket(s);
+            }
 
             return 0;
         }