From 676b2daabaf9a993db0e02a5ce79b984aaa0388b Mon Sep 17 00:00:00 2001 From: Song Liu Date: Wed, 2 Mar 2022 09:51:26 -0800 Subject: bpf, x86: Set header->size properly before freeing it On do_jit failure path, the header is freed by bpf_jit_binary_pack_free. While bpf_jit_binary_pack_free doesn't require proper ro_header->size, bpf_prog_pack_free still uses it. Set header->size in bpf_int_jit_compile before calling bpf_jit_binary_pack_free. Fixes: 1022a5498f6f ("bpf, x86_64: Use bpf_jit_binary_pack_alloc") Fixes: 33c9805860e5 ("bpf: Introduce bpf_jit_binary_pack_[alloc|finalize|free]") Reported-by: Kui-Feng Lee Signed-off-by: Song Liu Signed-off-by: Alexei Starovoitov Acked-by: Yonghong Song Link: https://lore.kernel.org/bpf/20220302175126.247459-3-song@kernel.org --- arch/x86/net/bpf_jit_comp.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'arch') diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c index c7db0fe4de2f..e6ff8f4f9ea4 100644 --- a/arch/x86/net/bpf_jit_comp.c +++ b/arch/x86/net/bpf_jit_comp.c @@ -2330,8 +2330,11 @@ skip_init_addrs: if (proglen <= 0) { out_image: image = NULL; - if (header) + if (header) { + bpf_arch_text_copy(&header->size, &rw_header->size, + sizeof(rw_header->size)); bpf_jit_binary_pack_free(header, rw_header); + } prog = orig_prog; goto out_addrs; } -- cgit v1.2.3-58-ga151