netdev - Re: [PATCH net] x86: bpf_jit: support negative offsets

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Date:	Tue, 11 Mar 2014 23:26:08 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	ast@...mgrid.com
Cc:	kaffeemonster@...glemail.com, edumazet@...gle.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH net] x86: bpf_jit: support negative offsets

From: Alexei Starovoitov <ast@...mgrid.com>
Date: Mon, 10 Mar 2014 15:56:51 -0700

> Commit a998d4342337 claimed to introduce negative offset support to x86 jit,
> but it couldn't be working, since at the time of the execution
> of LD+ABS or LD+IND instructions via call into
> bpf_internal_load_pointer_neg_helper() the %edx (3rd argument of this func)
> had junk value instead of access size in bytes (1 or 2 or 4).
> 
> Store size into %edx instead of %ecx (what original commit intended to do)
> 
> Fixes: a998d4342337 ("bpf jit: Let the x86 jit handle negative offsets")
> Signed-off-by: Alexei Starovoitov <ast@...mgrid.com>
> Cc: Jan Seiffert <kaffeemonster@...glemail.com>
> Cc: Eric Dumazet <edumazet@...gle.com>

Applied and queued up for -stable, thanks.
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