From: Ralf Lici <r...@mandelbit.com>
If dco_get_peer_stats() is called with an uninitialized c->c1.tuntap it
results in a segfault. This issue happens when a client who has not
connected to any server:
- has --management and exits,
- has --management and a management interface client issues either
`bytecount` or `status` or
- if SIGUSR2 is sent to it.
Add a check to ensure the tun interface was set up before attempting to
retrieve peer statistics.
Change-Id: I40c11864745cc1619cb9cbf490b168f90feb5eac
Signed-off-by: Ralf Lici <r...@mandelbit.com>
Acked-by: Gert Doering <g...@greenie.muc.de>
---
This change was reviewed on Gerrit and approved by at least one
developer. I request to merge it to master.
Gerrit URL: https://gerrit.openvpn.net/c/openvpn/+/1166
This mail reflects revision 2 of this Change.
Acked-by according to Gerrit (reflected above):
Gert Doering <g...@greenie.muc.de>
diff --git a/src/openvpn/dco_linux.c b/src/openvpn/dco_linux.c
index a3907fe..e70b74d 100644
--- a/src/openvpn/dco_linux.c
+++ b/src/openvpn/dco_linux.c
@@ -1139,6 +1139,8 @@
static int
dco_get_peer(dco_context_t *dco, int peer_id, const bool raise_sigusr1_on_err)
{
+ ASSERT(dco);
+
/* peer_id == -1 means "dump all peers", but this is allowed in MP mode
only.
* If it happens in P2P mode it means that the DCO peer was deleted and we
* can simply bail out
@@ -1182,6 +1184,11 @@
int
dco_get_peer_stats(struct context *c, const bool raise_sigusr1_on_err)
{
+ if (!c->c1.tuntap || c->c1.tuntap->dco.ifindex == 0)
+ {
+ return -1;
+ }
+
return dco_get_peer(&c->c1.tuntap->dco, c->c2.tls_multi->dco_peer_id,
raise_sigusr1_on_err);
}
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