netdev - [PATCH bpf] libbpf: fix SIGSEGV when BTF loading fails, but .BTF.ext exists

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Date:   Fri, 19 Jul 2019 12:32:42 -0700
From:   Andrii Nakryiko <andriin@...com>
To:     <bpf@...r.kernel.org>, <netdev@...r.kernel.org>, <ast@...com>,
        <daniel@...earbox.net>, <rdna@...com>
CC:     <andrii.nakryiko@...il.com>, <kernel-team@...com>,
        Andrii Nakryiko <andriin@...com>
Subject: [PATCH bpf] libbpf: fix SIGSEGV when BTF loading fails, but .BTF.ext exists

In case when BTF loading fails despite sanitization, but BPF object has
.BTF.ext loaded as well, we free and null obj->btf, but not
obj->btf_ext. This leads to an attempt to relocate .BTF.ext later on
during bpf_object__load(), which assumes obj->btf is present. This leads
to SIGSEGV on null pointer access. Fix bug by freeing and nulling
obj->btf_ext as well.

Signed-off-by: Andrii Nakryiko <andriin@...com>
---
 tools/lib/bpf/libbpf.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 794dd5064ae8..87168f21ef43 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -1500,6 +1500,12 @@ static int bpf_object__sanitize_and_load_btf(struct bpf_object *obj)
 			   BTF_ELF_SEC, err);
 		btf__free(obj->btf);
 		obj->btf = NULL;
+		/* btf_ext can't exist without btf, so free it as well */
+		if (obj->btf_ext) {
+			btf_ext__free(obj->btf_ext);
+			obj->btf_ext = NULL;
+		}
+
 		if (bpf_object__is_btf_mandatory(obj))
 			return err;
 	}
-- 
2.17.1