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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: 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
This commit is contained in:
Wang YanQing 2020-04-23 13:06:37 +08:00 committed by Alexei Starovoitov
parent 50fe7ebb64
commit 5ca1ca01fa
1 changed files with 1 additions and 1 deletions
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2
arch/x86/net/bpf_jit_comp32.c
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@ -1847,7 +1847,7 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
case BPF_B: case BPF_B:
case BPF_H: case BPF_H:
case BPF_W: case BPF_W:
if (!bpf_prog->aux->verifier_zext) if (bpf_prog->aux->verifier_zext)
break; break;
if (dstk) { if (dstk) {
EMIT3(0xC7, add_1reg(0x40, IA32_EBP), EMIT3(0xC7, add_1reg(0x40, IA32_EBP),