slirp: avoid use-after-free in slirp_pollfds_poll() if soread() returns an error

Samuel Thibault pointed out that it's possible that slirp_pollfds_poll()
will try to use a socket even after soread() returns an error, resulting
in an use-after-free if the socket was removed while handling the error.
Avoid this by refusing to continue to work with the socket in this case.

Signed-off-by: Steven Luo <steven+qemu@steven676.net>
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/socket.h b/socket.h
index dc28728..41b54c8 100644
--- a/socket.h
+++ b/socket.h
@@ -132,7 +132,7 @@ struct socket *solookup(struct socket **, struct socket *,
 struct socket *socreate(Slirp *);
 void sofree(struct socket *);
 int soread(struct socket *);
-void sorecvoob(struct socket *);
+int sorecvoob(struct socket *);
 int sosendoob(struct socket *);
 int sowrite(struct socket *);
 void sorecvfrom(struct socket *);