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slirp: Fix access to freed memory 

if_start() goes through the slirp->if_fastq and slirp->if_batchq
list of pending messages, and accesses ifm->ifq_so->so_nqueued of its
elements if ifm->ifq_so != NULL.  When freeing a socket, we thus need
to make sure that any pending message for this socket does not refer
to the socket any more.

Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Tested-by: Brian Candler <b.candler@pobox.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Samuel Thibault 2016-11-13 23:54:27 +01:00
parent 83c83f9a52
commit ea64d5f088
1 changed files with 17 additions and 0 deletions
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17
slirp/socket.c
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@ -66,6 +66,23 @@ void
sofree(struct socket *so) sofree(struct socket *so)
{ {
Slirp *slirp = so->slirp; Slirp *slirp = so->slirp;
struct mbuf *ifm;
for (ifm = (struct mbuf *) slirp->if_fastq.qh_link;
(struct quehead *) ifm != &slirp->if_fastq;
ifm = ifm->ifq_next) {
if (ifm->ifq_so == so) {
ifm->ifq_so = NULL;
}
}
for (ifm = (struct mbuf *) slirp->if_batchq.qh_link;
(struct quehead *) ifm != &slirp->if_batchq;
ifm = ifm->ifq_next) {
if (ifm->ifq_so == so) {
ifm->ifq_so = NULL;
}
}
if (so->so_emu==EMU_RSH && so->extra) { if (so->so_emu==EMU_RSH && so->extra) {
sofree(so->extra); sofree(so->extra);