netdev - Re: [iproute2 1/2] ss: fix crash when skipping disabled header field

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Date:   Tue, 9 Jan 2018 08:03:26 -0800
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Antonio Quartulli <a@...table.cc>
Cc:     netdev@...r.kernel.org, Stefano Brivio <sbrivio@...hat.com>
Subject: Re: [iproute2 1/2] ss: fix crash when skipping disabled header
 field

On Sun,  7 Jan 2018 02:31:49 +0800
Antonio Quartulli <a@...table.cc> wrote:

> When the first header field is disabled (i.e. when passing the -t
> option), field_flush() is invoked with the `buffer` global variable
> still zero'd.
> However, in field_flush() we try to access buffer.cur->len
> during variables initialization, thus leading to a SIGSEGV.
> 
> It's interesting to note that this bug appears only when the code
> is compiled with -O0, because the compiler is smart
> enough to immediately jump to the return statement if optimizations
> are enabled and skip the faulty instruction.
> 
> Cc: Stefano Brivio <sbrivio@...hat.com>
> Cc: Stephen Hemminger <stephen@...workplumber.org>
> Signed-off-by: Antonio Quartulli <a@...table.cc>

Both applied, thanks.