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batman-adv: Fix netlink dumping of BLA backbones 

[ Upstream commit fce672db54 ]

The function batadv_bla_backbone_dump_bucket must be able to handle
non-complete dumps of a single bucket. It tries to do that by saving the
latest dumped index in *idx_skip to inform the caller about the current
state.

But the caller only assumes that buckets were not completely dumped when
the return code is non-zero. This function must therefore also return a
non-zero index when the dumping of an entry failed. Otherwise the caller
will just skip all remaining buckets.

And the function must also reset *idx_skip back to zero when it finished a
bucket. Otherwise it will skip the same number of entries in the next
bucket as the previous one had.

Fixes: ea4152e117 ("batman-adv: add backbone table netlink support")
Reported-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Sven Eckelmann 2018-02-24 12:03:37 +01:00 committed by Greg Kroah-Hartman
parent f03c64fbdd
commit 588078bb27
1 changed files with 7 additions and 4 deletions
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11
net/batman-adv/bridge_loop_avoidance.c
View File

@ -2394,22 +2394,25 @@ batadv_bla_backbone_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
{
struct batadv_bla_backbone_gw *backbone_gw;
int idx = 0;
int ret = 0;
rcu_read_lock();
hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
if (idx++ < *idx_skip)
continue;
if (batadv_bla_backbone_dump_entry(msg, portid, seq,
primary_if, backbone_gw)) {
ret = batadv_bla_backbone_dump_entry(msg, portid, seq,
primary_if, backbone_gw);
if (ret) {
*idx_skip = idx - 1;
goto unlock;
}
}
*idx_skip = idx;
*idx_skip = 0;
unlock:
rcu_read_unlock();
return 0;
return ret;
}
/**