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| author |   Daniel Borkmann <daniel@iogearbox.net> | 2019-04-24 00:45:57 +0200 |
|---|---|---|
| committer |   Alexei Starovoitov <ast@kernel.org> | 2019-04-25 13:47:29 -0700 |
| commit | 4f8827d2b61ed32133e51f6a782bb69d80c7c3d4 (patch) | |
| tree | 2f161816188f7f305cc44ceea74afcf32ecc7b42 /tools/lib | |
| parent | bpf, libbpf: handle old kernels more graceful wrt global data sections (diff) | |
| download | linux-dev-4f8827d2b61ed32133e51f6a782bb69d80c7c3d4.tar.xz linux-dev-4f8827d2b61ed32133e51f6a782bb69d80c7c3d4.zip | |
bpf, libbpf: fix segfault in bpf_object__init_maps' pr_debug statement
Ran into it while testing; in bpf_object__init_maps() data can be NULL
in the case where no map section is present. Therefore we simply cannot
access data->d_size before NULL test. Move the pr_debug() where it's
safe to access.
Fixes: d859900c4c56 ("bpf, libbpf: support global data/bss/rodata sections")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'tools/lib')
| -rw-r--r-- | tools/lib/bpf/libbpf.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index 85315dedbde4..9052061ba7fc 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -875,14 +875,14 @@ bpf_object__init_maps(struct bpf_object *obj, int flags) nr_maps++; } - /* Alloc obj->maps and fill nr_maps. */ - pr_debug("maps in %s: %d maps in %zd bytes\n", obj->path, - nr_maps, data->d_size); if (!nr_maps && !nr_maps_glob) return 0; /* Assume equally sized map definitions */ if (data) { + pr_debug("maps in %s: %d maps in %zd bytes\n", obj->path, + nr_maps, data->d_size); + map_def_sz = data->d_size / nr_maps; if (!data->d_size || (data->d_size % nr_maps) != 0) { pr_warning("unable to determine map definition size " |