From: David Ahern dsahern@gmail.com
[ Upstream commit 9827c0634e461703abf81e8cc8b7adf5da5886d0 ]
Sven-Haegar reported looping on fib dumps when 255.255.255.255 route has been added to a table. The looping is caused by the key rolling over from FFFFFFFF to 0. When dumping a specific table only, we need a means to detect when the table dump is done. The key and count saved to cb args are both 0 only at the start of the table dump. If key is 0 and count > 0, then we are in the rollover case. Detect and return to avoid looping.
This only affects dumps of a specific table; for dumps of all tables (the case prior to the change in the Fixes tag) inet_dump_fib moved the entry counter to the next table and reset the cb args used by fib_table_dump and fn_trie_dump_leaf, so the rollover ffffffff back to 0 did not cause looping with the dumps.
Fixes: effe67926624 ("net: Enable kernel side filtering of route dumps") Reported-by: Sven-Haegar Koch haegar@sdinet.de Signed-off-by: David Ahern dsahern@gmail.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/ipv4/fib_trie.c | 6 ++++++ 1 file changed, 6 insertions(+)
--- a/net/ipv4/fib_trie.c +++ b/net/ipv4/fib_trie.c @@ -2175,6 +2175,12 @@ int fib_table_dump(struct fib_table *tb, int count = cb->args[2]; t_key key = cb->args[3];
+ /* First time here, count and key are both always 0. Count > 0 + * and key == 0 means the dump has wrapped around and we are done. + */ + if (count && !key) + return skb->len; + while ((l = leaf_walk_rcu(&tp, key)) != NULL) { int err;