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authorGuillaume Nault <g.nault@alphalink.fr>2018-04-25 19:54:14 +0200
committerDavid S. Miller <davem@davemloft.net>2018-04-27 17:06:35 +0200
commit834944073301e85001c3ed9913027ca47c6f889b (patch)
treedeb655628c17910683936af73a8b510992404ff2 /net/l2tp/l2tp_debugfs.c
parenttipc: introduce ioctl for fetching node identity (diff)
downloadlinux-834944073301e85001c3ed9913027ca47c6f889b.tar.xz
linux-834944073301e85001c3ed9913027ca47c6f889b.zip
l2tp: consistent reference counting in procfs and debufs
The 'pppol2tp' procfs and 'l2tp/tunnels' debugfs files handle reference counting of sessions differently than for tunnels. For consistency, use the same mechanism for handling both sessions and tunnels. That is, drop the reference on the previous session just before looking up the next one (rather than in .show()). If necessary (if dump stops before *_next_session() returns NULL), drop the last reference in .stop(). Signed-off-by: Guillaume Nault <g.nault@alphalink.fr> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/l2tp/l2tp_debugfs.c')
-rw-r--r--net/l2tp/l2tp_debugfs.c20
1 files changed, 13 insertions, 7 deletions
diff --git a/net/l2tp/l2tp_debugfs.c b/net/l2tp/l2tp_debugfs.c
index 7f1e842ef05a..e87686f7d63c 100644
--- a/net/l2tp/l2tp_debugfs.c
+++ b/net/l2tp/l2tp_debugfs.c
@@ -57,6 +57,10 @@ static void l2tp_dfs_next_tunnel(struct l2tp_dfs_seq_data *pd)
static void l2tp_dfs_next_session(struct l2tp_dfs_seq_data *pd)
{
+ /* Drop reference taken during previous invocation */
+ if (pd->session)
+ l2tp_session_dec_refcount(pd->session);
+
pd->session = l2tp_session_get_nth(pd->tunnel, pd->session_idx);
pd->session_idx++;
@@ -105,11 +109,16 @@ static void l2tp_dfs_seq_stop(struct seq_file *p, void *v)
if (!pd || pd == SEQ_START_TOKEN)
return;
- /* Drop reference taken by last invocation of l2tp_dfs_next_tunnel() */
+ /* Drop reference taken by last invocation of l2tp_dfs_next_session()
+ * or l2tp_dfs_next_tunnel().
+ */
+ if (pd->session) {
+ l2tp_session_dec_refcount(pd->session);
+ pd->session = NULL;
+ }
if (pd->tunnel) {
l2tp_tunnel_dec_refcount(pd->tunnel);
pd->tunnel = NULL;
- pd->session = NULL;
}
}
@@ -250,13 +259,10 @@ static int l2tp_dfs_seq_show(struct seq_file *m, void *v)
goto out;
}
- /* Show the tunnel or session context */
- if (!pd->session) {
+ if (!pd->session)
l2tp_dfs_seq_tunnel_show(m, pd->tunnel);
- } else {
+ else
l2tp_dfs_seq_session_show(m, pd->session);
- l2tp_session_dec_refcount(pd->session);
- }
out:
return 0;