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fix the logic to prevent using invalid iterators.

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First make a valid iterator, then dereference it. Not the other way round.
This bug can randomly prevent gxs group stats from being collected from peers.
This commit is contained in:
electron128 2016-01-01 13:44:38 +01:00
parent 3b2eae4f49
commit 58672e83a6
1 changed files with 5 additions and 3 deletions
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8
libretroshare/src/gxs/rsgxsnetservice.cc
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@ -733,7 +733,7 @@ void RsGxsNetService::syncGrpStatistics()
#ifdef NXS_NET_DEBUG_6
GXSNETDEBUG__G(it->first) << " needs update. Randomly asking to some friends" << std::endl;
#endif
// randomly select 2 friends among the suppliers of this group
// randomly select GROUP_STATS_UPDATE_NB_PEERS friends among the suppliers of this group
uint32_t n = RSRandom::random_u32() % rec.suppliers.size() ;
@ -743,13 +743,15 @@ void RsGxsNetService::syncGrpStatistics()
for(uint32_t i=0;i<std::min(rec.suppliers.size(),(size_t)GROUP_STATS_UPDATE_NB_PEERS);++i)
{
// we started at a random position in the set, wrap around if the end is reached
if(rit == rec.suppliers.end())
rit = rec.suppliers.begin() ;
RsPeerId peer_id = *rit ;
++rit ;
if(online_peers.find(peer_id) != online_peers.end()) // check that the peer is online
{
if(rit == rec.suppliers.end())
rit = rec.suppliers.begin() ;
#ifdef NXS_NET_DEBUG_6
GXSNETDEBUG_PG(peer_id,it->first) << " asking friend " << peer_id << " for an update of stats for group " << it->first << std::endl;