From: Andrii Nakryiko <andrii@kernel.org>
Date: Mon, 25 Apr 2022 17:45:04 -0700
Subject: libbpf: Fix logic for finding matching program for CO-RE relocation
Patch-mainline: v5.19-rc1
Git-commit: 966a7509325395c51c5f6d89e7352b0585e4804b
References: jsc#PED-1377
Fix the bug in bpf_object__relocate_core() which can lead to finding
invalid matching BPF program when processing CO-RE relocation. IF
matching program is not found, last encountered program will be assumed
to be correct program and thus error detection won't detect the problem.
Fixes: 9c82a63cf370 ("libbpf: Fix CO-RE relocs against .text section")
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20220426004511.2691730-4-andrii@kernel.org
Acked-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
---
tools/lib/bpf/libbpf.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -5677,9 +5677,10 @@ bpf_object__relocate_core(struct bpf_obj
*/
prog = NULL;
for (i = 0; i < obj->nr_programs; i++) {
- prog = &obj->programs[i];
- if (strcmp(prog->sec_name, sec_name) == 0)
+ if (strcmp(obj->programs[i].sec_name, sec_name) == 0) {
+ prog = &obj->programs[i];
break;
+ }
}
if (!prog) {
pr_warn("sec '%s': failed to find a BPF program\n", sec_name);