From: Andrii Nakryiko <andrii@kernel.org>
To: <bpf@vger.kernel.org>, <netdev@vger.kernel.org>, <ast@fb.com>,
<daniel@iogearbox.net>
Cc: <andrii@kernel.org>, <kernel-team@fb.com>
Subject: [PATCH bpf-next] libbpf: fix memory leak when emitting final btf_ext
Date: Fri, 26 Mar 2021 21:25:02 -0700 [thread overview]
Message-ID: <20210327042502.969745-1-andrii@kernel.org> (raw)
Free temporary allocated memory used to construct finalized .BTF.ext data.
Found by Coverity static analysis on libbpf's Github repo.
Fixes: 8fd27bf69b86 ("libbpf: Add BPF static linker BTF and BTF.ext support")
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
---
tools/lib/bpf/linker.c | 24 ++++++++++++++++--------
1 file changed, 16 insertions(+), 8 deletions(-)
diff --git a/tools/lib/bpf/linker.c b/tools/lib/bpf/linker.c
index a29d62ff8041..46b16cbdcda3 100644
--- a/tools/lib/bpf/linker.c
+++ b/tools/lib/bpf/linker.c
@@ -1906,8 +1906,10 @@ static int finalize_btf_ext(struct bpf_linker *linker)
struct dst_sec *sec = &linker->secs[i];
sz = emit_btf_ext_data(linker, cur, sec->sec_name, &sec->func_info);
- if (sz < 0)
- return sz;
+ if (sz < 0) {
+ err = sz;
+ goto out;
+ }
cur += sz;
}
@@ -1921,8 +1923,10 @@ static int finalize_btf_ext(struct bpf_linker *linker)
struct dst_sec *sec = &linker->secs[i];
sz = emit_btf_ext_data(linker, cur, sec->sec_name, &sec->line_info);
- if (sz < 0)
- return sz;
+ if (sz < 0) {
+ err = sz;
+ goto out;
+ }
cur += sz;
}
@@ -1936,8 +1940,10 @@ static int finalize_btf_ext(struct bpf_linker *linker)
struct dst_sec *sec = &linker->secs[i];
sz = emit_btf_ext_data(linker, cur, sec->sec_name, &sec->core_relo_info);
- if (sz < 0)
- return sz;
+ if (sz < 0) {
+ err = sz;
+ goto out;
+ }
cur += sz;
}
@@ -1948,8 +1954,10 @@ static int finalize_btf_ext(struct bpf_linker *linker)
if (err) {
linker->btf_ext = NULL;
pr_warn("failed to parse final .BTF.ext data: %d\n", err);
- return err;
+ goto out;
}
- return 0;
+out:
+ free(data);
+ return err;
}
--
2.30.2
next reply other threads:[~2021-03-27 4:33 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-27 4:25 Andrii Nakryiko [this message]
2021-03-29 15:54 ` [PATCH bpf-next] libbpf: fix memory leak when emitting final btf_ext Song Liu
2021-03-30 16:32 ` Alexei Starovoitov
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