Commit 5ca1ca01 authored Apr 23, 2020 by Wang YanQing Committed by Alexei Starovoitov Apr 24, 2020

bpf, x86_32: Fix logic error in BPF_LDX zero-extension



When verifier_zext is true, we don't need to emit code
for zero-extension.

Fixes: 836256bf ("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

parent 50fe7ebb

arch/x86/net/bpf_jit_comp32.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1847,7 +1847,7 @@ static int do_jit(struct bpf_prog bpf_prog, int addrs, u8 *image,
		case BPF_B:
		case BPF_H:
		case BPF_W:
		if (!bpf_prog->aux->verifier_zext)
		if (bpf_prog->aux->verifier_zext)
		break;
		if (dstk) {
		EMIT3(0xC7, add_1reg(0x40, IA32_EBP),

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