From a095b4649f6eb1f5b7b9c1a9a26adc13601f3377 Mon Sep 17 00:00:00 2001 From: Peter Maydell Date: Tue, 6 Nov 2018 15:13:20 +0000 Subject: slirp: Don't pass possibly -1 fd to send() Coverity complains (CID 1005726) that we might pass -1 as the fd argument to send() in slirp_send(), because we previously checked for "so->s == -1 && so->extra". The case of "so->s == -1 but so->extra NULL" should not in theory happen, but it is hard to guarantee because various places in the code do so->s = qemu_socket(...) and so will end up with so->s == -1 on failure, and not all the paths which call that always throw away the socket in that case (eg tcp_fconnect()). So just check specifically for the condition and fail slirp_send(). Signed-off-by: Peter Maydell Signed-off-by: Samuel Thibault --- slirp.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/slirp.c b/slirp.c index 9ff78dd..6be44ba 100644 --- a/slirp.c +++ b/slirp.c @@ -1084,6 +1084,17 @@ ssize_t slirp_send(struct socket *so, const void *buf, size_t len, int flags) return len; } + if (so->s == -1) { + /* + * This should in theory not happen but it is hard to be + * sure because some code paths will end up with so->s == -1 + * on a failure but don't dispose of the struct socket. + * Check specifically, so we don't pass -1 to send(). + */ + errno = EBADF; + return -1; + } + return send(so->s, buf, len, flags); } -- cgit v1.1