session: read interface stats in the session's own netns

ap_session_read_stats() reached netlink through the thread-local "net".
Callers outside the session's context, such as "show sessions" with
rx-bytes/tx-bytes columns, run on an arbitrary triton thread where
"net" is NULL (never set on that thread) or still points at another
session's namespace: a NULL dereference in iplink_get_stats(), or
counters read from the wrong namespace.

Switch to ses->net around the query and restore it afterwards. Inside
the session's context net == ses->net already, so nothing changes there.

Why not the fixes suggested in the issue: a NULL check in
iplink_get_stats() or net = def_net in the CLI still queries the wrong
namespace for sessions outside the default netns, and reporting cached
counters would make "show sessions" stale.

Fixes #378

Signed-off-by: Denys Fedoryshchenko <denys.f@collabora.com>

0 files changed, 0 insertions, 0 deletions