netdev - [PATCH bpf-next 4/9] libbpf: check map name retrieved from ELF

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Message-ID: <20190529011426.1328736-5-andriin@fb.com>
Date:   Tue, 28 May 2019 18:14:21 -0700
From:   Andrii Nakryiko <andriin@...com>
To:     <andrii.nakryiko@...il.com>, <netdev@...r.kernel.org>,
        <bpf@...r.kernel.org>, <ast@...com>, <daniel@...earbox.net>,
        <kernel-team@...com>
CC:     Andrii Nakryiko <andriin@...com>
Subject: [PATCH bpf-next 4/9] libbpf: check map name retrieved from ELF

Validate there was no error retrieving symbol name corresponding to
a BPF map.

Signed-off-by: Andrii Nakryiko <andriin@...com>
---
 tools/lib/bpf/libbpf.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index c98f9942fba4..7abe71ee507a 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -920,6 +920,11 @@ bpf_object__init_maps(struct bpf_object *obj, int flags)
 		map_name = elf_strptr(obj->efile.elf,
 				      obj->efile.strtabidx,
 				      sym.st_name);
+		if (!map_name) {
+			pr_warning("failed to get map #%d name sym string for obj %s\n",
+				   map_idx, obj->path);
+			return -LIBBPF_ERRNO__FORMAT;
+		}
 
 		obj->maps[map_idx].libbpf_type = LIBBPF_MAP_UNSPEC;
 		obj->maps[map_idx].offset = sym.st_value;
-- 
2.17.1