linux-kernel - Re: [PATCH net-next v3] net: mana: Allow variable size indirection table

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240604053648.GA14220@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net>
Date: Mon, 3 Jun 2024 22:36:48 -0700
From: Shradha Gupta <shradhagupta@...ux.microsoft.com>
To: Leon Romanovsky <leon@...nel.org>
Cc: linux-hardening@...r.kernel.org, netdev@...r.kernel.org,
	linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-rdma@...r.kernel.org, Colin Ian King <colin.i.king@...il.com>,
	Ahmed Zaki <ahmed.zaki@...el.com>,
	Pavan Chebbi <pavan.chebbi@...adcom.com>,
	Souradeep Chakrabarti <schakrabarti@...ux.microsoft.com>,
	Konstantin Taranov <kotaranov@...rosoft.com>,
	Kees Cook <keescook@...omium.org>, Paolo Abeni <pabeni@...hat.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	"David S. Miller" <davem@...emloft.net>,
	Dexuan Cui <decui@...rosoft.com>, Wei Liu <wei.liu@...nel.org>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Jason Gunthorpe <jgg@...pe.ca>, Long Li <longli@...rosoft.com>,
	Shradha Gupta <shradhagupta@...rosoft.com>
Subject: Re: [PATCH net-next v3] net: mana: Allow variable size indirection
 table

On Mon, Jun 03, 2024 at 11:41:22AM +0300, Leon Romanovsky wrote:
> On Fri, May 31, 2024 at 08:37:41AM -0700, Shradha Gupta wrote:
> > Allow variable size indirection table allocation in MANA instead
> > of using a constant value MANA_INDIRECT_TABLE_SIZE.
> > The size is now derived from the MANA_QUERY_VPORT_CONFIG and the
> > indirection table is allocated dynamically.
> > 
> > Signed-off-by: Shradha Gupta <shradhagupta@...ux.microsoft.com>
> > Reviewed-by: Dexuan Cui <decui@...rosoft.com>
> > Reviewed-by: Haiyang Zhang <haiyangz@...rosoft.com>
> > ---
> >  Changes in v3:
> >  * Fixed the memory leak(save_table) in mana_set_rxfh()
> > 
> >  Changes in v2:
> >  * Rebased to latest net-next tree
> >  * Rearranged cleanup code in mana_probe_port to avoid extra operations
> > ---
> >  drivers/infiniband/hw/mana/qp.c               | 10 +--
> >  drivers/net/ethernet/microsoft/mana/mana_en.c | 68 ++++++++++++++++---
> >  .../ethernet/microsoft/mana/mana_ethtool.c    | 27 +++++---
> >  include/net/mana/gdma.h                       |  4 +-
> >  include/net/mana/mana.h                       |  9 +--
> >  5 files changed, 89 insertions(+), 29 deletions(-)
> 
> <...>
> 
> > +free_indir:
> > +	apc->indir_table_sz = 0;
> > +	kfree(apc->indir_table);
> > +	apc->indir_table = NULL;
> > +	kfree(apc->rxobj_table);
> > +	apc->rxobj_table = NULL;
> >  reset_apc:
> >  	kfree(apc->rxqs);
> >  	apc->rxqs = NULL;
> > @@ -2897,6 +2936,7 @@ void mana_remove(struct gdma_dev *gd, bool suspending)
> >  {
> 
> <...>
> 
> > @@ -2931,6 +2972,11 @@ void mana_remove(struct gdma_dev *gd, bool suspending)
> >  		}
> >  
> >  		unregister_netdevice(ndev);
> > +		apc->indir_table_sz = 0;
> > +		kfree(apc->indir_table);
> > +		apc->indir_table = NULL;
> > +		kfree(apc->rxobj_table);
> > +		apc->rxobj_table = NULL;
> 
> Why do you need to NULLify here? Will apc is going to be accessible
> after call to mana_remove? or port probe failure?
Right, they won't be accessed. This is just for the sake of completeness
and to prevent double free in case there are code bug in other place.

Regards,
Shradha.
> 
> Thanks