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

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Message-Id: <1394492211-4268-1-git-send-email-ast@plumgrid.com>
Date:	Mon, 10 Mar 2014 15:56:51 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	Jan Seiffert <kaffeemonster@...glemail.com>,
	Eric Dumazet <edumazet@...gle.com>, netdev@...r.kernel.org
Subject: [PATCH net] x86: bpf_jit: support negative offsets

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>
--
This is a single bit patch. Is there a leaderboard of shortest patches? ;)

 arch/x86/net/bpf_jit.S |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/net/bpf_jit.S b/arch/x86/net/bpf_jit.S
index 877b9a1..0149575 100644
--- a/arch/x86/net/bpf_jit.S
+++ b/arch/x86/net/bpf_jit.S
@@ -140,7 +140,7 @@ bpf_slow_path_byte_msh:
 	push	%r9;						\
 	push	SKBDATA;					\
 /* rsi already has offset */					\
-	mov	$SIZE,%ecx;	/* size */			\
+	mov	$SIZE,%edx;	/* size */			\
 	call	bpf_internal_load_pointer_neg_helper;		\
 	test	%rax,%rax;					\
 	pop	SKBDATA;					\
-- 
1.7.9.5

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