Re: [PATCH] net: sctp: prevent writes to cookie_hmac_alg from accessing invalid memory

[David Miller]

From: Sasha Levin <sasha.levin@xxxxxxxxxx>
Date: Thu,  7 Jan 2016 14:52:43 -0500

> proc_dostring() needs an initialized destination string, while the one
> provided in proc_sctp_do_hmac_alg() contains stack garbage.
> 
> Thus, writing to cookie_hmac_alg would strlen() that garbage and end up
> accessing invalid memory.
> 
> Fixes: 3c68198e7 ("sctp: Make hmac algorithm selection for cookie generation dynamic")
> Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>

Applied and queued up for -stable, thanks.