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bpf, arm: fix emit_ldx_r and emit_mov_i using TMP_REG_1

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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>
This commit is contained in:
Nicolas Schichan 2018-12-19 22:40:42 +01:00 committed by Greg Kroah-Hartman
parent f1e1eb5c90
commit ad962d20d4
1 changed files with 1 additions and 1 deletions
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2
arch/arm/net/bpf_jit_32.c
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@ -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;