netdev - Re: [PATCH] perf env: fix memory leak: free bpf_prog_info

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Date:   Fri, 4 Jun 2021 10:09:01 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Riccardo Mancini <rickyman7@...il.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        linux-perf-users <linux-perf-users@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH] perf env: fix memory leak: free bpf_prog_info_linear

Em Thu, Jun 03, 2021 at 09:15:32PM -0700, Ian Rogers escreveu:
> On Wed, Jun 2, 2021 at 3:41 PM Riccardo Mancini <rickyman7@...il.com> wrote:
> >
> > ASan reported a memory leak caused by info_linear not being
> > deallocated. The info_linear was allocated during
> > perf_event__synthesize_one_bpf_prog.
> > This patch adds the corresponding free() when bpf_prog_info_node
> > is freed in perf_env__purge_bpf.
> >
> > $ sudo ./perf record -- sleep 5
> > [ perf record: Woken up 1 times to write data ]
> > [ perf record: Captured and wrote 0.025 MB perf.data (8 samples) ]
> >
> > =================================================================
> > ==297735==ERROR: LeakSanitizer: detected memory leaks
> >
> > Direct leak of 7688 byte(s) in 19 object(s) allocated from:
> >     #0 0x4f420f in malloc (/home/user/linux/tools/perf/perf+0x4f420f)
> >     #1 0xc06a74 in bpf_program__get_prog_info_linear /home/user/linux/tools/lib/bpf/libbpf.c:11113:16
> >     #2 0xb426fe in perf_event__synthesize_one_bpf_prog /home/user/linux/tools/perf/util/bpf-event.c:191:16
> >     #3 0xb42008 in perf_event__synthesize_bpf_events /home/user/linux/tools/perf/util/bpf-event.c:410:9
> >     #4 0x594596 in record__synthesize /home/user/linux/tools/perf/builtin-record.c:1490:8
> >     #5 0x58c9ac in __cmd_record /home/user/linux/tools/perf/builtin-record.c:1798:8
> >     #6 0x58990b in cmd_record /home/user/linux/tools/perf/builtin-record.c:2901:8
> >     #7 0x7b2a20 in run_builtin /home/user/linux/tools/perf/perf.c:313:11
> >     #8 0x7b12ff in handle_internal_command /home/user/linux/tools/perf/perf.c:365:8
> >     #9 0x7b2583 in run_argv /home/user/linux/tools/perf/perf.c:409:2
> >     #10 0x7b0d79 in main /home/user/linux/tools/perf/perf.c:539:3
> >     #11 0x7fa357ef6b74 in __libc_start_main /usr/src/debug/glibc-2.33-8.fc34.x86_64/csu/../csu/libc-start.c:332:16
> >
> > Signed-off-by: Riccardo Mancini <rickyman7@...il.com>
> 
> Acked-by: Ian Rogers <irogers@...gle.com>

Thanks, applied.

- Arnaldo