netdev - Re: [PATCH net-next, net v2] net/tls: Set count of SG entries if sk_alloc

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Date:   Sun, 09 Sep 2018 08:10:38 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     vakul.garg@....com
Cc:     netdev@...r.kernel.org, borisp@...lanox.com, aviadye@...lanox.com,
        davejwatson@...com, doronrk@...com
Subject: Re: [PATCH net-next, net v2] net/tls: Set count of SG entries if
 sk_alloc_sg returns -ENOSPC

From: Vakul Garg <vakul.garg@....com>
Date: Thu,  6 Sep 2018 21:41:40 +0530

> tls_sw_sendmsg() allocates plaintext and encrypted SG entries using
> function sk_alloc_sg(). In case the number of SG entries hit
> MAX_SKB_FRAGS, sk_alloc_sg() returns -ENOSPC and sets the variable for
> current SG index to '0'. This leads to calling of function
> tls_push_record() with 'sg_encrypted_num_elem = 0' and later causes
> kernel crash. To fix this, set the number of SG elements to the number
> of elements in plaintext/encrypted SG arrays in case sk_alloc_sg()
> returns -ENOSPC.
> 
> Fixes: 3c4d7559159b ("tls: kernel TLS support")
> Signed-off-by: Vakul Garg <vakul.garg@....com>

Applied to 'net' and queued up for -stable.