netdev - Re: [PATCH net-next 09/18] tls: Add rx inline crypto offload

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Message-ID: <201807051502.uHnjPqIu%fengguang.wu@intel.com>
Date:   Thu, 5 Jul 2018 16:29:32 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Boris Pismenny <borisp@...lanox.com>
Cc:     kbuild-all@...org, davem@...emloft.net, netdev@...r.kernel.org,
        davejwatson@...com, aviadye@...lanox.com, borisp@...lanox.com,
        saeedm@...lanox.com
Subject: Re: [PATCH net-next 09/18] tls: Add rx inline crypto offload

Hi Boris,

I love your patch! Perhaps something to improve:

[auto build test WARNING on net-next/master]

url:    https://github.com/0day-ci/linux/commits/Boris-Pismenny/TLS-offload-rx-netdev-mlx5/20180705-064704
config: x86_64-randconfig-s1-07051503 (attached as .config)
compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

Note: it may well be a FALSE warning. FWIW you are at least aware of it now.
http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings

All warnings (new ones prefixed by >>):

   net//tls/tls_sw.c: In function 'decrypt_skb_update':
>> net//tls/tls_sw.c:685:9: warning: 'err' may be used uninitialized in this function [-Wmaybe-uninitialized]
     return err;
            ^~~

vim +/err +685 net//tls/tls_sw.c

c46234eb Dave Watson    2018-03-22  659  
13000621 Boris Pismenny 2018-07-04  660  static int decrypt_skb_update(struct sock *sk, struct sk_buff *skb,
13000621 Boris Pismenny 2018-07-04  661  			      struct scatterlist *sgout)
13000621 Boris Pismenny 2018-07-04  662  {
13000621 Boris Pismenny 2018-07-04  663  	struct tls_context *tls_ctx = tls_get_ctx(sk);
13000621 Boris Pismenny 2018-07-04  664  	struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
13000621 Boris Pismenny 2018-07-04  665  	struct strp_msg *rxm = strp_msg(skb);
13000621 Boris Pismenny 2018-07-04  666  	int err;
13000621 Boris Pismenny 2018-07-04  667  
52ffb3bf Boris Pismenny 2018-07-04  668  #ifdef CONFIG_TLS_DEVICE
52ffb3bf Boris Pismenny 2018-07-04  669  	err = tls_device_decrypted(sk, skb);
52ffb3bf Boris Pismenny 2018-07-04  670  	if (err < 0)
52ffb3bf Boris Pismenny 2018-07-04  671  		return err;
52ffb3bf Boris Pismenny 2018-07-04  672  #endif
52ffb3bf Boris Pismenny 2018-07-04  673  	if (!ctx->decrypted) {
13000621 Boris Pismenny 2018-07-04  674  		err = decrypt_skb(sk, skb, sgout);
13000621 Boris Pismenny 2018-07-04  675  		if (err < 0)
13000621 Boris Pismenny 2018-07-04  676  			return err;
52ffb3bf Boris Pismenny 2018-07-04  677  	}
13000621 Boris Pismenny 2018-07-04  678  
13000621 Boris Pismenny 2018-07-04  679  	rxm->offset += tls_ctx->rx.prepend_size;
13000621 Boris Pismenny 2018-07-04  680  	rxm->full_len -= tls_ctx->rx.overhead_size;
13000621 Boris Pismenny 2018-07-04  681  	tls_advance_record_sn(sk, &tls_ctx->rx);
13000621 Boris Pismenny 2018-07-04  682  	ctx->decrypted = true;
13000621 Boris Pismenny 2018-07-04  683  	ctx->saved_data_ready(sk);
13000621 Boris Pismenny 2018-07-04  684  
13000621 Boris Pismenny 2018-07-04 @685  	return err;
13000621 Boris Pismenny 2018-07-04  686  }
13000621 Boris Pismenny 2018-07-04  687  

:::::: The code at line 685 was first introduced by commit
:::::: 1300062159ee8551834a4371379b82abe20f436e tls: Split decrypt_skb to two functions

:::::: TO: Boris Pismenny <borisp@...lanox.com>
:::::: CC: 0day robot <lkp@...el.com>

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