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Re: [Qemu-devel] [PATCH 3/3] slirp: tcp_listen(): Don't try to close() a


From: Philippe Mathieu-Daudé
Subject: Re: [Qemu-devel] [PATCH 3/3] slirp: tcp_listen(): Don't try to close() an fd we never opened
Date: Sat, 11 Feb 2017 01:15:47 -0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.6.0

On 02/04/2017 08:08 PM, Peter Maydell wrote:
Coverity points out (CID 1005725) that an error-exit path in tcp_listen()
will try to close(s) even if the reason it got there was that the
qemu_socket() failed and s was never opened.  Not only that, this isn't even
the right function to use, because we need closesocket() to do the right
thing on Windows.  Change to using the right function and only calling it if
needed.

Signed-off-by: Peter Maydell <address@hidden>

Reviewed-by: Philippe Mathieu-Daudé <address@hidden>

---
 slirp/socket.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/slirp/socket.c b/slirp/socket.c
index 6c18971..8692772 100644
--- a/slirp/socket.c
+++ b/slirp/socket.c
@@ -713,7 +713,9 @@ tcp_listen(Slirp *slirp, uint32_t haddr, u_int hport, 
uint32_t laddr,
            (listen(s,1) < 0)) {
                int tmperrno = errno; /* Don't clobber the real reason we 
failed */

-               close(s);
+                if (s >= 0) {
+                    closesocket(s);
+                }
                sofree(so);
                /* Restore the real errno */
 #ifdef _WIN32




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