[PATCH 5.10 031/103] chtls: Fix panic when route to peer not configured

Greg Kroah-Hartman
2021-01-15T12:47:45Z

From: Ayush Sawal <ayush.sawal@chelsio.com>

[ Upstream commit 5a5fac9966bb6d513198634b0b1357be7e8447d2 ]

If route to peer is not configured, we might get non tls
devices from dst_neigh_lookup() which is invalid, adding a
check to avoid it.

Fixes: cc35c88ae4db ("crypto : chtls - CPL handler definition")
Signed-off-by: Rohit Maheshwari <rohitm@chelsio.com>
Signed-off-by: Ayush Sawal <ayush.sawal@chelsio.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_cm.c | 14 ++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_cm.c
+++ b/drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_cm.c
@@ -1109,6 +1109,7 @@ static struct sock *chtls_recv_sock(stru
const struct cpl_pass_accept_req *req,
struct chtls_dev *cdev)
{
+ struct adapter *adap = pci_get_drvdata(cdev->pdev);
struct neighbour *n = NULL;
struct inet_sock *newinet;
const struct iphdr *iph;
@@ -1118,9 +1119,10 @@ static struct sock *chtls_recv_sock(stru
struct dst_entry *dst;
struct tcp_sock *tp;
struct sock *newsk;
+ bool found = false;
u16 port_id;
int rxq_idx;
- int step;
+ int step, i;

iph = (const struct iphdr *)network_hdr;
newsk = tcp_create_openreq_child(lsk, oreq, cdev->askb);
@@ -1152,7 +1154,7 @@ static struct sock *chtls_recv_sock(stru
n = dst_neigh_lookup(dst, &ip6h->saddr);
#endif
}
- if (!n)
+ if (!n || !n->dev)
goto free_sk;

ndev = n->dev;
@@ -1161,6 +1163,13 @@ static struct sock *chtls_recv_sock(stru
if (is_vlan_dev(ndev))
ndev = vlan_dev_real_dev(ndev);

+ for_each_port(adap, i)
+ if (cdev->ports[i] == ndev)
+ found = true;
+
+ if (!found)
+ goto free_dst;
+
port_id = cxgb4_port_idx(ndev);

csk = chtls_sock_create(cdev);
@@ -1237,6 +1246,7 @@ static struct sock *chtls_recv_sock(stru
free_csk:
chtls_sock_release(&csk->kref);
free_dst:
+ neigh_release(n);
dst_release(dst);
free_sk:
inet_csk_prepare_forced_close(newsk);