Re: [iptables PATCH] xtables: Catch errors when zeroing rule rounters

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Hi Pablo,

On Fri, Dec 21, 2018 at 12:35:38PM +0100, Pablo Neira Ayuso wrote:
> On Fri, Dec 21, 2018 at 12:24:55PM +0100, Pablo Neira Ayuso wrote:
> > On Sat, Dec 15, 2018 at 07:25:04PM +0100, Phil Sutter wrote:
> > > Covscan complained about call to batch_rule_add() not being checked.
> > > 
> > > Signed-off-by: Phil Sutter <phil@xxxxxx>
> > > ---
> > >  iptables/nft.c | 4 +++-
> > >  1 file changed, 3 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/iptables/nft.c b/iptables/nft.c
> > > index f9024927c0e73..ea7419b620e7a 100644
> > > --- a/iptables/nft.c
> > > +++ b/iptables/nft.c
> > > @@ -3022,7 +3022,9 @@ static int __nft_chain_zero_counters(struct nftnl_chain *c, void *data)
> > >  			 * rule based on its handle only.
> > >  			 */
> > >  			nftnl_rule_unset(r, NFTNL_RULE_POSITION);
> > > -			batch_rule_add(h, NFT_COMPAT_RULE_REPLACE, r);
> > > +			ret = batch_rule_add(h, NFT_COMPAT_RULE_REPLACE, r);
> > > +			if (ret)
> > > +				return -1;
> > 
> > Probably 'goto err' so we destroy the iterator before returning -1?

Oh, right. I Missed that.

> Let me get to review your larger pending patchset, then you can
> resubmit this on top.
> 
> Sorry I didn't get to this any sooner.

Thanks! And no worries, we all are busy with multiple things at once. :)

Cheers, Phil



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