From: Andrii Nakryiko <andriin@fb.com>
To: <bpf@vger.kernel.org>, <netdev@vger.kernel.org>, <ast@fb.com>,
<daniel@iogearbox.net>
Cc: <andrii.nakryiko@gmail.com>, <kernel-team@fb.com>,
Andrii Nakryiko <andriin@fb.com>
Subject: [PATCH bpf-next 4/5] libbpf: make btf__resolve_size logic always check size error condition
Date: Wed, 6 Nov 2019 18:08:54 -0800 [thread overview]
Message-ID: <20191107020855.3834758-5-andriin@fb.com> (raw)
In-Reply-To: <20191107020855.3834758-1-andriin@fb.com>
Perform size check always in btf__resolve_size. Makes the logic a bit more
robust against corrupted BTF and silences LGTM/Coverity complaining about
always true (size < 0) check.
Fixes: 69eaab04c675 ("btf: extract BTF type size calculation")
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
---
tools/lib/bpf/btf.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
index d72e9a79dce1..86a1847e4a9f 100644
--- a/tools/lib/bpf/btf.c
+++ b/tools/lib/bpf/btf.c
@@ -269,10 +269,9 @@ __s64 btf__resolve_size(const struct btf *btf, __u32 type_id)
t = btf__type_by_id(btf, type_id);
}
+done:
if (size < 0)
return -EINVAL;
-
-done:
if (nelems && size > UINT32_MAX / nelems)
return -E2BIG;
--
2.17.1
next prev parent reply other threads:[~2019-11-07 2:09 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-07 2:08 [PATCH bpf-next 0/5] Fix bugs and issues found by static analysis in libbpf Andrii Nakryiko
2019-11-07 2:08 ` [PATCH bpf-next 1/5] libbpf: fix memory leak/double free issue Andrii Nakryiko
2019-11-07 2:08 ` [PATCH bpf-next 2/5] libbpf: fix potential overflow issue Andrii Nakryiko
2019-11-07 2:08 ` [PATCH bpf-next 3/5] libbpf: fix another potential overflow issue in bpf_prog_linfo Andrii Nakryiko
2019-11-07 2:08 ` Andrii Nakryiko [this message]
2019-11-07 2:08 ` [PATCH bpf-next 5/5] libbpf: improve handling of corrupted ELF during map initialization Andrii Nakryiko
2019-11-07 16:35 ` [PATCH bpf-next 0/5] Fix bugs and issues found by static analysis in libbpf Daniel Borkmann
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