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| author | Andrii Nakryiko <andriin@fb.com> | 2020-01-24 12:18:46 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-02-11 04:35:29 -0800 |
| commit | f7a2ccc00a364ff5b380933101836dfb2304390c (patch) | |
| tree | 8e6baad483ff62b143a416ca3e3a6b35f4fbacaf /tools/lib/bpf/libbpf.c | |
| parent | ab48c14a444b9198e91435526b68bfdf2613c2d0 (diff) | |
| download | linux-stable-f7a2ccc00a364ff5b380933101836dfb2304390c.tar.gz linux-stable-f7a2ccc00a364ff5b380933101836dfb2304390c.tar.bz2 linux-stable-f7a2ccc00a364ff5b380933101836dfb2304390c.zip | |
libbpf: Fix realloc usage in bpf_core_find_cands
commit 35b9211c0a2427e8f39e534f442f43804fc8d5ca upstream.
Fix bug requesting invalid size of reallocated array when constructing CO-RE
relocation candidate list. This can cause problems if there are many potential
candidates and a very fine-grained memory allocator bucket sizes are used.
Fixes: ddc7c3042614 ("libbpf: implement BPF CO-RE offset relocation algorithm")
Reported-by: William Smith <williampsmith@fb.com>
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20200124201847.212528-1-andriin@fb.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools/lib/bpf/libbpf.c')
| -rw-r--r-- | tools/lib/bpf/libbpf.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index d98838c5820c..b6403712c2f4 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -2541,7 +2541,9 @@ static struct ids_vec *bpf_core_find_cands(const struct btf *local_btf, if (strncmp(local_name, targ_name, local_essent_len) == 0) { pr_debug("[%d] %s: found candidate [%d] %s\n", local_type_id, local_name, i, targ_name); - new_ids = realloc(cand_ids->data, cand_ids->len + 1); + new_ids = reallocarray(cand_ids->data, + cand_ids->len + 1, + sizeof(*cand_ids->data)); if (!new_ids) { err = -ENOMEM; goto err_out; |