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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Russell King <rmk+kernel@armlinux.org.uk>,
        Nicolas Schichan <nschichan@freebox.fr>,
        Daniel Borkmann <daniel@iogearbox.net>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.14 72/72] bpf, arm: fix emit_ldx_r and emit_mov_i using TMP_REG_1
Date:   Thu, 20 Dec 2018 10:19:11 +0100
Message-Id: <20181220085925.164928102@linuxfoundation.org>
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4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

emit_ldx_r() and emit_a32_mov_i() were both using TMP_REG_1 and
clashing with each other. Using TMP_REG_2 in emit_ldx_r() fixes
the issue.

Fixes: ec19e02b343 ("ARM: net: bpf: fix LDX instructions")
Cc: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Nicolas Schichan <nschichan@freebox.fr>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/arm/net/bpf_jit_32.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/net/bpf_jit_32.c b/arch/arm/net/bpf_jit_32.c
index ece2d1d43724..dafeb5f81353 100644
--- a/arch/arm/net/bpf_jit_32.c
+++ b/arch/arm/net/bpf_jit_32.c
@@ -915,7 +915,7 @@ static inline void emit_str_r(const u8 dst, const u8 src, bool dstk,
 /* dst = *(size*)(src + off) */
 static inline void emit_ldx_r(const u8 dst[], const u8 src, bool dstk,
 			      s32 off, struct jit_ctx *ctx, const u8 sz){
-	const u8 *tmp = bpf2a32[TMP_REG_1];
+	const u8 *tmp = bpf2a32[TMP_REG_2];
 	const u8 *rd = dstk ? tmp : dst;
 	u8 rm = src;
 	s32 off_max;
-- 
2.19.1