diff options
| author | Andrii Nakryiko <andrii@kernel.org> | 2021-03-26 21:25:02 -0700 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2021-03-30 07:38:36 -0700 |
| commit | 05d817031ff9686a8206039b19e37616cf9e1d44 (patch) | |
| tree | 427327f17c4ce85fe062d98b9f1f9a7342b4dd6d /tools/lib/bpf/linker.c | |
| parent | b83fd195c228bdb7b45f3933919296fa6511fcf5 (diff) | |
libbpf: Fix memory leak when emitting final btf_ext
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>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20210327042502.969745-1-andrii@kernel.org
Diffstat (limited to 'tools/lib/bpf/linker.c')
| -rw-r--r-- | tools/lib/bpf/linker.c | 24 |
1 files 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; } |