From: Markos Chandras Date: Mon, 23 Jun 2014 09:38:51 +0000 (+0100) Subject: MIPS: bpf: Fix branch conditional for BPF_J{GT/GE} cases X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=1ab24a4e3de1ec37d8ed255841d2d94d77e8a4f4;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git MIPS: bpf: Fix branch conditional for BPF_J{GT/GE} cases The sltiu and sltu instructions will set the scratch register to 1 if A <= X|K so fix the emitted branch conditional to check for scratch != zero rather than scratch >= zero which would complicate the resuling branch logic given that MIPS does not have a BGT or BGET instructions to compare general purpose registers directly. Signed-off-by: Markos Chandras Cc: David S. Miller Cc: Daniel Borkmann Cc: Alexei Starovoitov Cc: netdev@vger.kernel.org Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/7126/ Signed-off-by: Ralf Baechle --- diff --git a/arch/mips/net/bpf_jit.c b/arch/mips/net/bpf_jit.c index 8cae27af03da..500f97fdc0e1 100644 --- a/arch/mips/net/bpf_jit.c +++ b/arch/mips/net/bpf_jit.c @@ -1127,7 +1127,7 @@ jmp_cmp: } /* A < (K|X) ? r_scrach = 1 */ b_off = b_imm(i + inst->jf + 1, ctx); - emit_bcond(MIPS_COND_GT, r_s0, r_zero, b_off, + emit_bcond(MIPS_COND_NE, r_s0, r_zero, b_off, ctx); emit_nop(ctx); /* A > (K|X) ? scratch = 0 */