From: bot+bpf-ci@kernel.org
To: alan.maguire@oracle.com,andrii@kernel.org,ast@kernel.org
Cc: daniel@iogearbox.net,martin.lau@linux.dev,eddyz87@gmail.com,song@kernel.org,yonghong.song@linux.dev,john.fastabend@gmail.com,kpsingh@kernel.org,sdf@fomichev.me,haoluo@google.com,jolsa@kernel.org,qmo@kernel.org,ihor.solodrai@linux.dev,dwarves@vger.kernel.org,bpf@vger.kernel.org,ttreyer@meta.com,alan.maguire@oracle.com,ast@kernel.org,andrii@kernel.org,daniel@iogearbox.net,martin.lau@kernel.org,eddyz87@gmail.com,yonghong.song@linux.dev,clm@meta.com,ihor.solodrai@linux.dev
Subject: Re: [PATCH v6 bpf-next 02/10] libbpf: Support kind layout section handling in BTF
Date: Wed, 10 Dec 2025 20:55:58 +0000 (UTC) [thread overview]
Message-ID: <aa32deb9e8e7ee4895f4884d375153f5fcf90b5b319e3f7052f4b14f47bb8504@mail.kernel.org> (raw)
In-Reply-To: <20251210203243.814529-3-alan.maguire@oracle.com>
[-- Attachment #1: Type: text/plain, Size: 1793 bytes --]
> diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
> index b136572e889a..737adc560818 100644
> --- a/tools/lib/bpf/btf.c
> +++ b/tools/lib/bpf/btf.c
[ ... ]
> @@ -994,6 +1048,7 @@ void btf__free(struct btf *btf)
>
> static struct btf *btf_new_empty(struct btf *base_btf)
> {
> + struct btf_header *hdr;
> struct btf *btf;
>
> btf = calloc(1, sizeof(*btf));
> @@ -1022,14 +1077,20 @@ static struct btf *btf_new_empty(struct btf *base_btf)
> return ERR_PTR(-ENOMEM);
> }
>
> - btf->hdr = btf->raw_data;
> - btf->hdr->hdr_len = sizeof(struct btf_header);
> - btf->hdr->magic = BTF_MAGIC;
> - btf->hdr->version = BTF_VERSION;
> + hdr = btf->raw_data;
> + hdr->hdr_len = sizeof(struct btf_header);
> + hdr->magic = BTF_MAGIC;
> + hdr->version = BTF_VERSION;
>
> - btf->types_data = btf->raw_data + btf->hdr->hdr_len;
> - btf->strs_data = btf->raw_data + btf->hdr->hdr_len;
> - btf->hdr->str_len = base_btf ? 0 : 1; /* empty string at offset 0 */
> + btf->types_data = btf->raw_data + hdr->hdr_len;
> + btf->strs_data = btf->raw_data + hdr->hdr_len;
> + hdr->str_len = base_btf ? 0 : 1; /* empty string at offset 0 */
> + btf->hdr = calloc(1, sizeof(struct btf_header));
> + if (!btf->hdr) {
> + free(btf);
> + return ERR_PTR(-ENOMEM);
> + }
> + memcpy(btf->hdr, hdr, sizeof(*hdr));
>
> return btf;
> }
Does this leak btf->raw_data when the btf->hdr allocation fails? The
btf->raw_data was allocated earlier (at line 1074 in the new code), but
if we reach the error path here, we only free(btf) without freeing
btf->raw_data first.
---
AI reviewed your patch. Please fix the bug or email reply why it's not a bug.
See: https://github.com/kernel-patches/vmtest/blob/master/ci/claude/README.md
CI run summary: https://github.com/kernel-patches/bpf/actions/runs/20112692486
next prev parent reply other threads:[~2025-12-10 20:56 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-12-10 20:32 [PATCH v6 bpf-next 00/10] Add kind layout to BTF Alan Maguire
2025-12-10 20:32 ` [PATCH v6 bpf-next 01/10] btf: add kind layout encoding to UAPI Alan Maguire
2025-12-10 20:55 ` bot+bpf-ci
2025-12-13 2:52 ` Mykyta Yatsenko
2025-12-10 20:32 ` [PATCH v6 bpf-next 02/10] libbpf: Support kind layout section handling in BTF Alan Maguire
2025-12-10 20:55 ` bot+bpf-ci [this message]
2025-12-11 8:31 ` Alan Maguire
2025-12-13 3:37 ` Mykyta Yatsenko
2025-12-10 20:32 ` [PATCH v6 bpf-next 03/10] libbpf: use kind layout to compute an unknown kind size Alan Maguire
2025-12-10 20:55 ` bot+bpf-ci
2025-12-11 8:33 ` Alan Maguire
2025-12-13 3:51 ` Mykyta Yatsenko
2025-12-10 20:32 ` [PATCH v6 bpf-next 04/10] libbpf: Add kind layout encoding support Alan Maguire
2025-12-10 20:55 ` bot+bpf-ci
2025-12-11 8:36 ` Alan Maguire
2025-12-11 10:23 ` Alan Maguire
2025-12-10 20:32 ` [PATCH v6 bpf-next 05/10] libbpf: BTF validation can use kind layout for unknown kinds Alan Maguire
2025-12-10 20:55 ` bot+bpf-ci
2025-12-10 20:32 ` [PATCH v6 bpf-next 06/10] btf: support kernel parsing of BTF with kind layout Alan Maguire
2025-12-10 20:32 ` [PATCH v6 bpf-next 07/10] selftests/bpf: test kind encoding/decoding Alan Maguire
2025-12-10 20:55 ` bot+bpf-ci
2025-12-10 20:32 ` [PATCH v6 bpf-next 08/10] bpftool: add BTF dump "format meta" to dump header/metadata Alan Maguire
2025-12-10 20:55 ` bot+bpf-ci
2025-12-10 20:32 ` [PATCH v6 bpf-next 09/10] bpftool: Update doc to describe bpftool btf dump .. format metadata Alan Maguire
2025-12-10 20:32 ` [PATCH v6 bpf-next 10/10] kbuild, bpf: Specify "kind_layout" optional feature Alan Maguire
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