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| author |   Tom Parkin <tparkin@katalix.com> | 2020-07-24 16:31:55 +0100 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2020-07-24 17:19:14 -0700 |
| commit | 493048f5dfcd0093880414928717f68613ba9157 (patch) | |
| tree | cde0594b8ee371b19ca93b0a2cf6b3ca9e02ad57 /net/l2tp/l2tp_core.c | |
| parent | l2tp: don't BUG_ON seqfile checks in l2tp_ppp (diff) | |
| download | linux-dev-493048f5dfcd0093880414928717f68613ba9157.tar.xz linux-dev-493048f5dfcd0093880414928717f68613ba9157.zip | |
l2tp: WARN_ON rather than BUG_ON in l2tp_session_queue_purge
l2tp_session_queue_purge is used during session shutdown to drop any
skbs queued for reordering purposes according to L2TP dataplane rules.
The BUG_ON in this function checks the session magic feather in an
attempt to catch lifetime bugs.
Rather than crashing the kernel with a BUG_ON, we can simply WARN_ON and
refuse to do anything more -- in the worst case this could result in a
leak. However this is highly unlikely given that the session purge only
occurs from codepaths which have obtained the session by means of a lookup
via. the parent tunnel and which check the session "dead" flag to
protect against shutdown races.
While we're here, have l2tp_session_queue_purge return void rather than
an integer, since neither of the callsites checked the return value.
Signed-off-by: Tom Parkin <tparkin@katalix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/l2tp/l2tp_core.c')
| -rw-r--r-- | net/l2tp/l2tp_core.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/net/l2tp/l2tp_core.c b/net/l2tp/l2tp_core.c index 6be3f2e69efd..e228480fa529 100644 --- a/net/l2tp/l2tp_core.c +++ b/net/l2tp/l2tp_core.c @@ -773,16 +773,17 @@ EXPORT_SYMBOL(l2tp_recv_common); /* Drop skbs from the session's reorder_q */ -static int l2tp_session_queue_purge(struct l2tp_session *session) +static void l2tp_session_queue_purge(struct l2tp_session *session) { struct sk_buff *skb = NULL; - BUG_ON(session->magic != L2TP_SESSION_MAGIC); + if (WARN_ON(session->magic != L2TP_SESSION_MAGIC)) + return; + while ((skb = skb_dequeue(&session->reorder_q))) { atomic_long_inc(&session->stats.rx_errors); kfree_skb(skb); } - return 0; } /* Internal UDP receive frame. Do the real work of receiving an L2TP data frame |