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ipv6_route_seq_next should increase position index

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[ Upstream commit 4fc427e0515811250647d44de38d87d7b0e0790f ]

if seq_file .next fuction does not change position index,
read after some lseek can generate unexpected output.

https://bugzilla.kernel.org/show_bug.cgi?id=206283
Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Vasily Averin 2020-01-23 10:12:06 +03:00 committed by Greg Kroah-Hartman
parent 046e79cca2
commit c89925822f
1 changed files with 2 additions and 5 deletions
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7
net/ipv6/ip6_fib.c
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@ -2479,14 +2479,13 @@ static void *ipv6_route_seq_next(struct seq_file *seq, void *v, loff_t *pos)
struct net *net = seq_file_net(seq);
struct ipv6_route_iter *iter = seq->private;
++(*pos);
if (!v)
goto iter_table;
n = rcu_dereference_bh(((struct fib6_info *)v)->fib6_next);
if (n) {
++*pos;
if (n)
return n;
}
iter_table:
ipv6_route_check_sernum(iter);
@ -2494,8 +2493,6 @@ iter_table:
r = fib6_walk_continue(&iter->w);
spin_unlock_bh(&iter->tbl->tb6_lock);
if (r > 0) {
if (v)
++*pos;
return iter->w.leaf;
} else if (r < 0) {
fib6_walker_unlink(net, &iter->w);