This is a note to let you know that I've just added the patch titled
bpf, x86_32: Fix logic error in BPF_LDX zero-extension
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
bpf-x86_32-fix-logic-error-in-bpf_ldx-zero-extension.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit be37e57662647eded97622b427e6b5b56a767f0f
Author: Wang YanQing <udknight@xxxxxxxxx>
Date: Thu Apr 23 13:06:37 2020 +0800
bpf, x86_32: Fix logic error in BPF_LDX zero-extension
commit 5ca1ca01fae1e90f8d010eb1d83374f28dc11ee6 upstream.
When verifier_zext is true, we don't need to emit code
for zero-extension.
Fixes: 836256bf5f37 ("x32: bpf: eliminate zero extension code-gen")
Signed-off-by: Wang YanQing <udknight@xxxxxxxxx>
Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx>
Link: https://lore.kernel.org/bpf/20200423050637.GA4029@udknight
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
diff --git a/arch/x86/net/bpf_jit_comp32.c b/arch/x86/net/bpf_jit_comp32.c
index ba7d9ccfc6626..66cd150b7e541 100644
--- a/arch/x86/net/bpf_jit_comp32.c
+++ b/arch/x86/net/bpf_jit_comp32.c
@@ -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),
