For vxlan fan networks, iproute2 uses the flag IFLA_VXLAN_FAN_MAP to
configure Ubuntu Fan vxlan devices.
The vxlan fan netlink data parsing is handled in the kernel (see
drivers/net/vxlan/vxlan_core.c) with:
...
if (data[IFLA_VXLAN_FAN_MAP]) {
err = vxlan_parse_fan_map(data, vxlan);
if (err)
return err;
}
...
...
static int vxlan_parse_fan_map(struct nlattr *data[], struct vxlan_dev *vxlan)
{
struct ifla_fan_map *map;
struct nlattr *attr;
int rem, rv;
nla_for_each_nested(attr, data[IFLA_IPTUN_FAN_MAP], rem) {
map = nla_data(attr);
rv = vxlan_fan_add_map(vxlan, map);
if (rv)
return rv;
}
return 0;
}
...
The vxlan_parse_fan_map() function incorrectly uses the
IFLA_IPTUN_FAN_MAP flag instead of IFLA_VXLAN_FAN_MAP.
In the past, IFLA_VXLAN_FAN_MAP == IFLA_IPTUN_FAN_MAP == 33, and so this
worked. Now, IFLA_VXLAN_FAN_MAP == 34, while IFLA_IPTUN_FAN_MAP == 33,
so it checks for attributes at IFLA_VXLAN_FAN_MAP (34) but attempts to
access attributes at IFLA_IPTUN_FAN_MAP (33).
A straightforward fix appears to be adjusting vxlan_parse_fan_map() to
access IFLA_VXLAN_FAN_MAP instead of IFLA_IPTUN_FAN_MAP.
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https://bugs.launchpad.net/bugs/2113992
Title:
NULL pointer dereference caught by ubuntu_fan_smoke_test:sut-scan
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