path: root/tools/lib
diff options
authorAndrii Nakryiko <andriin@fb.com>2020-01-24 12:18:46 -0800
committerDaniel Borkmann <daniel@iogearbox.net>2020-01-24 22:34:37 +0100
commit35b9211c0a2427e8f39e534f442f43804fc8d5ca (patch)
tree447a49a6541913091f7183f618de47e83c0c20f2 /tools/lib
parentlibbpf: Improve handling of failed CO-RE relocations (diff)
libbpf: Fix realloc usage in bpf_core_find_cands
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
Diffstat (limited to 'tools/lib')
1 files changed, 3 insertions, 1 deletions
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 39f1b7633a7c..514b1a524abb 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -3869,7 +3869,9 @@ 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;