bpf, x86_32: Fix logic error in BPF_LDX zero-extension
commit5.4-rM2-2.2.x-imx-squashed5ca1ca01fa
upstream. When verifier_zext is true, we don't need to emit code for zero-extension. Fixes:836256bf5f
("x32: bpf: eliminate zero extension code-gen") Signed-off-by: Wang YanQing <udknight@gmail.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200423050637.GA4029@udknight Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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d0b8695703
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309a509dab
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@ -1847,7 +1847,7 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
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case BPF_B:
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case BPF_H:
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case BPF_W:
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if (!bpf_prog->aux->verifier_zext)
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if (bpf_prog->aux->verifier_zext)
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break;
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if (dstk) {
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EMIT3(0xC7, add_1reg(0x40, IA32_EBP),
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