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

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commit 5ca1ca01fa 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>
This commit is contained in:
Wang YanQing
2020-04-23 13:06:37 +08:00
committed by Greg Kroah-Hartman
parent d0b8695703
commit 309a509dab
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_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),