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 5.6-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-5.6 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 8a65df35acf3e1f8d719637074bd419e23e0f0f5 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),