netdev - Re: [PATCH net] bpf: fix map not being uncharged during map creation failure

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Message-Id: <20161107.132355.1099647347767603358.davem@davemloft.net>
Date:   Mon, 07 Nov 2016 13:23:55 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     daniel@...earbox.net
Cc:     netdev@...r.kernel.org, ast@...nel.org
Subject: Re: [PATCH net] bpf: fix map not being uncharged during map
 creation failure

From: Daniel Borkmann <daniel@...earbox.net>
Date: Fri,  4 Nov 2016 00:56:31 +0100

> In map_create(), we first find and create the map, then once that
> suceeded, we charge it to the user's RLIMIT_MEMLOCK, and then fetch
> a new anon fd through anon_inode_getfd(). The problem is, once the
> latter fails f.e. due to RLIMIT_NOFILE limit, then we only destruct
> the map via map->ops->map_free(), but without uncharging the previously
> locked memory first. That means that the user_struct allocation is
> leaked as well as the accounted RLIMIT_MEMLOCK memory not released.
> Make the label names in the fix consistent with bpf_prog_load().
> 
> Fixes: aaac3ba95e4c ("bpf: charge user for creation of BPF maps and programs")
> Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
> Acked-by: Alexei Starovoitov <ast@...nel.org>

Applied and queued up for -stable.