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AJvYcCVxkYXlATlmLawD5sbgeOoC9D3UzKGLRybAB999kqM8aCN0XyePBwgeqKo+GF7MJCdDFQMQyoxAL9QD6tg=@vger.kernel.org X-Gm-Message-State: AOJu0YxvpuxDeQuQkhOyyIFaMH0NKTYGwEl6LXA8Xg3BTwkqGNOpahJx /bZ3of3MjAKgXbi0fn6mZwdPAm3THX/5v9YiQlw5QC3sfQA3tEueGabyjH3meyWVyKFCnpCcr0n NGdxNIcl2gA== X-Received: from dlbcq13.prod.google.com ([2002:a05:7022:248d:b0:11d:cf4c:62ab]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a05:7022:2487:b0:119:e56c:18a8 with SMTP id a92af1059eb24-1244a7257e1mr4331178c88.16.1768627767987; Fri, 16 Jan 2026 21:29:27 -0800 (PST) Date: Fri, 16 Jan 2026 21:28:31 -0800 In-Reply-To: <20260117052849.2205545-1-irogers@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260117052849.2205545-1-irogers@google.com> X-Mailer: git-send-email 2.52.0.457.g6b5491de43-goog Message-ID: <20260117052849.2205545-6-irogers@google.com> Subject: [PATCH v1 05/23] perf libdw_addr2line: Fixes to srcline memory allocation From: Ian Rogers To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Jiri Olsa , Ian Rogers , Adrian Hunter , James Clark , John Garry , Will Deacon , Leo Yan , Guo Ren , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Shimin Guo , Athira Rajeev , Stephen Brennan , Howard Chu , Thomas Falcon , Andi Kleen , "Dr. David Alan Gilbert" , Dmitry Vyukov , "=?UTF-8?q?Krzysztof=20=C5=81opatowski?=" , Chun-Tse Shao , Aditya Bodkhe , Haibo Xu , Sergei Trofimovich , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-riscv@lists.infradead.org, Mark Wielaard Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Some irregular stack traces are causing double frees and memory leaks. Make the code robust by proactively freeing and being more careful with the memory management of the leaf_srcline. Fixes: 88c51002d06f ("perf addr2line: Add a libdw implementation") Signed-off-by: Ian Rogers --- tools/perf/util/libdw.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) diff --git a/tools/perf/util/libdw.c b/tools/perf/util/libdw.c index e4bfd52bd172..b96c4e0d728f 100644 --- a/tools/perf/util/libdw.c +++ b/tools/perf/util/libdw.c @@ -42,16 +42,24 @@ static int libdw_a2l_cb(Dwarf_Die *die, void *_args) call_srcline =3D srcline_from_fileline(call_fname, die_get_call_lineno(d= ie)); =20 list_for_each_entry(ilist, &args->node->val, list) { + if (args->leaf_srcline =3D=3D ilist->srcline) + args->leaf_srcline_used =3D false; + else if (ilist->srcline !=3D srcline__unknown) + free(ilist->srcline); ilist->srcline =3D call_srcline; call_srcline =3D NULL; break; } - if (call_srcline && call_fname) + if (call_srcline && call_srcline !=3D srcline__unknown) free(call_srcline); =20 /* Add this symbol to the chain as the leaf. */ - inline_list__append_tail(inline_sym, args->leaf_srcline, args->node); - args->leaf_srcline_used =3D true; + if (!args->leaf_srcline_used) { + inline_list__append_tail(inline_sym, args->leaf_srcline, args->node); + args->leaf_srcline_used =3D true; + } else { + inline_list__append_tail(inline_sym, strdup(args->leaf_srcline), args->n= ode); + } return 0; } =20 --=20 2.52.0.457.g6b5491de43-goog