From: Alexei Starovoitov <ast@kernel.org>
Date: Sat, 11 Dec 2021 18:08:19 -0800
Subject: bpf: Silence coverity false positive warning.
Patch-mainline: v5.17-rc1
Git-commit: f18a499799dd0f0fdd98cf72d98d3866ce9ac60e
References: jsc#PED-1377
Coverity issued the following warning:
6685 cands = bpf_core_add_cands(cands, main_btf, 1);
6686 if (IS_ERR(cands))
>>> CID 1510300: (RETURN_LOCAL)
>>> Returning pointer "cands" which points to local variable "local_cand".
6687 return cands;
It's a false positive.
Add ERR_CAST() to silence it.
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
---
kernel/bpf/btf.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -6656,7 +6656,7 @@ bpf_core_find_cands(struct bpf_core_ctx
main_btf = bpf_get_btf_vmlinux();
if (IS_ERR(main_btf))
- return (void *)main_btf;
+ return ERR_CAST(main_btf);
local_type = btf_type_by_id(local_btf, local_type_id);
if (!local_type)
@@ -6683,14 +6683,14 @@ bpf_core_find_cands(struct bpf_core_ctx
/* Attempt to find target candidates in vmlinux BTF first */
cands = bpf_core_add_cands(cands, main_btf, 1);
if (IS_ERR(cands))
- return cands;
+ return ERR_CAST(cands);
/* cands is a pointer to kmalloced memory here if cands->cnt > 0 */
/* populate cache even when cands->cnt == 0 */
cc = populate_cand_cache(cands, vmlinux_cand_cache, VMLINUX_CAND_CACHE_SIZE);
if (IS_ERR(cc))
- return cc;
+ return ERR_CAST(cc);
/* if vmlinux BTF has any candidate, don't go for module BTFs */
if (cc->cnt)
@@ -6716,7 +6716,7 @@ check_modules:
cands = bpf_core_add_cands(cands, mod_btf, btf_nr_types(main_btf));
if (IS_ERR(cands)) {
btf_put(mod_btf);
- return cands;
+ return ERR_CAST(cands);
}
spin_lock_bh(&btf_idr_lock);
btf_put(mod_btf);