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l2tp: don't BUG_ON seqfile checks in l2tp_ppp

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checkpatch advises that WARN_ON and recovery code are preferred over
BUG_ON which crashes the kernel.

l2tp_ppp has a BUG_ON check of struct seq_file's private pointer in
pppol2tp_seq_start prior to accessing data through that pointer.

Rather than crashing, we can simply bail out early and return NULL in
order to terminate the seq file processing in much the same way as we do
when reaching the end of tunnel/session instances to render.

Retain a WARN_ON to help trace possible bugs in this area.

Signed-off-by: Tom Parkin <tparkin@katalix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Parkin 2020-07-24 16:31:54 +01:00 committed by David S. Miller
parent 1aa646ac71
commit ebb4f5e6e4
1 changed files with 5 additions and 1 deletions
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6
net/l2tp/l2tp_ppp.c
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@ -1478,7 +1478,11 @@ static void *pppol2tp_seq_start(struct seq_file *m, loff_t *offs)
if (!pos)
goto out;
BUG_ON(!m->private);
if (WARN_ON(!m->private)) {
pd = NULL;
goto out;
}
pd = m->private;
net = seq_file_net(m);