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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2011-11-29 20:05:55 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-11-30 17:24:14 -0500 |
| commit | 218fa90f072e4aeff9003d57e390857f4f35513e (patch) | |
| tree | 09563123179d16ab4ba74812c741b72636268ca1 | |
| parent | f7e57044eeb1841847c24aa06766c8290c202583 (diff) | |
| download | linux-stable-218fa90f072e4aeff9003d57e390857f4f35513e.tar.gz linux-stable-218fa90f072e4aeff9003d57e390857f4f35513e.tar.bz2 linux-stable-218fa90f072e4aeff9003d57e390857f4f35513e.zip | |
ipv4: fix lockdep splat in rt_cache_seq_show
After commit f2c31e32b378 (fix NULL dereferences in check_peer_redir()),
dst_get_neighbour() should be guarded by rcu_read_lock() /
rcu_read_unlock() section.
Reported-by: Miles Lane <miles.lane@gmail.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ipv4/route.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c index 5c2847247f51..57e01bc60947 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -417,9 +417,13 @@ static int rt_cache_seq_show(struct seq_file *seq, void *v) else { struct rtable *r = v; struct neighbour *n; - int len; + int len, HHUptod; + rcu_read_lock(); n = dst_get_neighbour(&r->dst); + HHUptod = (n && (n->nud_state & NUD_CONNECTED)) ? 1 : 0; + rcu_read_unlock(); + seq_printf(seq, "%s\t%08X\t%08X\t%8X\t%d\t%u\t%d\t" "%08X\t%d\t%u\t%u\t%02X\t%d\t%1d\t%08X%n", r->dst.dev ? r->dst.dev->name : "*", @@ -433,7 +437,7 @@ static int rt_cache_seq_show(struct seq_file *seq, void *v) dst_metric(&r->dst, RTAX_RTTVAR)), r->rt_key_tos, -1, - (n && (n->nud_state & NUD_CONNECTED)) ? 1 : 0, + HHUptod, r->rt_spec_dst, &len); seq_printf(seq, "%*s\n", 127 - len, ""); |