From: Kumar Kartikeya Dwivedi <memxor@gmail.com>
To: bpf@vger.kernel.org
Cc: Alexei Starovoitov <ast@kernel.org>,
Andrii Nakryiko <andrii@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Martin KaFai Lau <martin.lau@kernel.org>,
Dave Marchevsky <davemarchevsky@meta.com>
Subject: [PATCH bpf-next v9 03/23] bpf: Free inner_map_meta when btf_record_dup fails
Date: Fri, 18 Nov 2022 04:24:50 +0530 [thread overview]
Message-ID: <20221117225510.1676785-4-memxor@gmail.com> (raw)
In-Reply-To: <20221117225510.1676785-1-memxor@gmail.com>
Whenever btf_record_dup fails, we must free inner_map_meta that was
allocated before.
This fixes a memory leak (in case of errors) during inner map creation.
Fixes: aa3496accc41 ("bpf: Refactor kptr_off_tab into btf_record")
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
---
kernel/bpf/map_in_map.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/kernel/bpf/map_in_map.c b/kernel/bpf/map_in_map.c
index 8ca0cca39d49..a423130a8720 100644
--- a/kernel/bpf/map_in_map.c
+++ b/kernel/bpf/map_in_map.c
@@ -52,12 +52,14 @@ struct bpf_map *bpf_map_meta_alloc(int inner_map_ufd)
inner_map_meta->max_entries = inner_map->max_entries;
inner_map_meta->record = btf_record_dup(inner_map->record);
if (IS_ERR(inner_map_meta->record)) {
+ struct bpf_map *err_ptr = ERR_CAST(inner_map_meta->record);
/* btf_record_dup returns NULL or valid pointer in case of
* invalid/empty/valid, but ERR_PTR in case of errors. During
* equality NULL or IS_ERR is equivalent.
*/
+ kfree(inner_map_meta);
fdput(f);
- return ERR_CAST(inner_map_meta->record);
+ return err_ptr;
}
if (inner_map->btf) {
btf_get(inner_map->btf);
--
2.38.1
next prev parent reply other threads:[~2022-11-17 22:55 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-17 22:54 [PATCH bpf-next v9 00/23] Allocated objects, BPF linked lists Kumar Kartikeya Dwivedi
2022-11-17 22:54 ` [PATCH bpf-next v9 01/23] bpf: Fix early return in map_check_btf Kumar Kartikeya Dwivedi
2022-11-17 22:54 ` [PATCH bpf-next v9 02/23] bpf: Do btf_record_free outside map_free callback Kumar Kartikeya Dwivedi
2022-11-17 22:54 ` Kumar Kartikeya Dwivedi [this message]
2022-11-17 22:54 ` [PATCH bpf-next v9 04/23] bpf: Populate field_offs for inner_map_meta Kumar Kartikeya Dwivedi
2022-11-17 22:54 ` [PATCH bpf-next v9 05/23] bpf: Introduce allocated objects support Kumar Kartikeya Dwivedi
2022-11-17 22:54 ` [PATCH bpf-next v9 06/23] bpf: Recognize lock and list fields in allocated objects Kumar Kartikeya Dwivedi
2022-11-17 22:54 ` [PATCH bpf-next v9 07/23] bpf: Verify ownership relationships for user BTF types Kumar Kartikeya Dwivedi
2022-11-17 22:54 ` [PATCH bpf-next v9 08/23] bpf: Allow locking bpf_spin_lock in allocated objects Kumar Kartikeya Dwivedi
2022-11-17 22:54 ` [PATCH bpf-next v9 09/23] bpf: Allow locking bpf_spin_lock global variables Kumar Kartikeya Dwivedi
2022-11-17 22:54 ` [PATCH bpf-next v9 10/23] bpf: Allow locking bpf_spin_lock in inner map values Kumar Kartikeya Dwivedi
2022-11-17 22:54 ` [PATCH bpf-next v9 11/23] bpf: Rewrite kfunc argument handling Kumar Kartikeya Dwivedi
2022-11-17 22:54 ` [PATCH bpf-next v9 12/23] bpf: Support constant scalar arguments for kfuncs Kumar Kartikeya Dwivedi
2022-11-17 22:55 ` [PATCH bpf-next v9 13/23] bpf: Introduce bpf_obj_new Kumar Kartikeya Dwivedi
2022-11-17 22:55 ` [PATCH bpf-next v9 14/23] bpf: Introduce bpf_obj_drop Kumar Kartikeya Dwivedi
2022-11-17 22:55 ` [PATCH bpf-next v9 15/23] bpf: Permit NULL checking pointer with non-zero fixed offset Kumar Kartikeya Dwivedi
2022-11-17 22:55 ` [PATCH bpf-next v9 16/23] bpf: Introduce single ownership BPF linked list API Kumar Kartikeya Dwivedi
2022-11-18 0:12 ` Alexei Starovoitov
2022-11-17 22:55 ` [PATCH bpf-next v9 17/23] bpf: Add 'release on unlock' logic for bpf_list_push_{front,back} Kumar Kartikeya Dwivedi
2022-11-17 22:55 ` [PATCH bpf-next v9 18/23] bpf: Add comments for map BTF matching requirement for bpf_list_head Kumar Kartikeya Dwivedi
2022-11-17 22:55 ` [PATCH bpf-next v9 19/23] selftests/bpf: Add __contains macro to bpf_experimental.h Kumar Kartikeya Dwivedi
2022-11-17 22:55 ` [PATCH bpf-next v9 20/23] selftests/bpf: Update spinlock selftest Kumar Kartikeya Dwivedi
2022-11-17 22:55 ` [PATCH bpf-next v9 21/23] selftests/bpf: Add failure test cases for spin lock pairing Kumar Kartikeya Dwivedi
2022-11-17 22:55 ` [PATCH bpf-next v9 22/23] selftests/bpf: Add BPF linked list API tests Kumar Kartikeya Dwivedi
2022-11-17 23:05 ` Alexei Starovoitov
2022-11-17 23:27 ` Dave Marchevsky
2022-11-17 23:58 ` Kumar Kartikeya Dwivedi
2022-11-18 0:05 ` Alexei Starovoitov
2022-11-17 23:29 ` Yonghong Song
2022-11-17 22:55 ` [PATCH bpf-next v9 23/23] selftests/bpf: Add BTF sanity tests Kumar Kartikeya Dwivedi
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