From 3d79bc7e88a22371df575bb61fa2e18c61e08c58 Mon Sep 17 00:00:00 2001
From: Quentin Monnet <quentin@isovalent.com>
Date: Thu, 29 Jul 2021 17:20:21 +0100
Subject: [PATCH] libbpf: Return non-null error on failures in libbpf_find_prog_btf_id()
Git-commit: 6d2d73cdd673d493f9f3751188757129b1d23fb7
Patch-mainline: v5.15-rc1
References: stable-5.14.4
[ Upstream commit 6d2d73cdd673d493f9f3751188757129b1d23fb7 ]
Variable "err" is initialised to -EINVAL so that this error code is
returned when something goes wrong in libbpf_find_prog_btf_id().
However, a recent change in the function made use of the variable in
such a way that it is set to 0 if retrieving linear information on the
program is successful, and this 0 value remains if we error out on
failures at later stages.
Let's fix this by setting err to -EINVAL later in the function.
Fixes: e9fc3ce99b34 ("libbpf: Streamline error reporting for high-level APIs")
Signed-off-by: Quentin Monnet <quentin@isovalent.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210729162028.29512-2-quentin@isovalent.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
tools/lib/bpf/libbpf.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index aa5ad6fc5f40..2234d5c33177 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -9515,7 +9515,7 @@ static int libbpf_find_prog_btf_id(const char *name, __u32 attach_prog_fd)
struct bpf_prog_info_linear *info_linear;
struct bpf_prog_info *info;
struct btf *btf = NULL;
- int err = -EINVAL;
+ int err;
info_linear = bpf_program__get_prog_info_linear(attach_prog_fd, 0);
err = libbpf_get_error(info_linear);
@@ -9524,6 +9524,8 @@ static int libbpf_find_prog_btf_id(const char *name, __u32 attach_prog_fd)
attach_prog_fd);
return err;
}
+
+ err = -EINVAL;
info = &info_linear->info;
if (!info->btf_id) {
pr_warn("The target program doesn't have BTF\n");
--
2.26.2