From: Daniel Borkmann <daniel@iogearbox.net>
Date: Fri, 6 Jan 2017 23:26:33 +0000 (+0100)
Subject: bpf: change back to orig prog on too many passes
X-Git-Tag: v4.9.4~35
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b55f6ca7380d609a40e0441d345404d100da3d45;p=thirdparty%2Fkernel%2Fstable.git

bpf: change back to orig prog on too many passes

[ Upstream commit 9d5ecb09d525469abd1a10c096cb5a17206523f2 ]

If after too many passes still no image could be emitted, then
swap back to the original program as we do in all other cases
and don't use the one with blinding.

Fixes: 959a75791603 ("bpf, x86: add support for constant blinding")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
index fe04a04dab8ec..15f7436159236 100644
--- a/arch/x86/net/bpf_jit_comp.c
+++ b/arch/x86/net/bpf_jit_comp.c
@@ -1172,6 +1172,8 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
 		set_memory_ro((unsigned long)header, header->pages);
 		prog->bpf_func = (void *)image;
 		prog->jited = 1;
+	} else {
+		prog = orig_prog;
 	}
 
 out_addrs: