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Thu, 28 May 2026 23:50:59 -0700 (PDT) Received: from [127.0.1.1] ([104.28.157.202]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-36bc0c1ab21sm952626a91.14.2026.05.28.23.50.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 28 May 2026 23:50:58 -0700 (PDT) Subject: [PATCH 6/6] subcmd: fix memory leak in parse_options_subcommand From: Wang Haoran To: acme@kernel.org Cc: peterz@infradead.org, mingo@redhat.com, namhyung@kernel.org, mark.rutland@arm.com, alexander.shishkin@linux.intel.com, linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, haoranwangsec@gmail.com Date: Fri, 29 May 2026 14:50:45 +0800 Message-ID: <178003744574.62097.15841011812312422288@gmail.com> In-Reply-To: <178003738371.62097.10360938456907564684@gmail.com> References: <178003738371.62097.10360938456907564684@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="===============7114621159298678336==" --===============7114621159298678336== Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable >>From 9e71ffe9400fd54c4fc958b16229e5628271e4ad Mon Sep 17 00:00:00 2001 From: Wang Haoran Date: Thu, 28 May 2026 15:18:33 +0800 Subject: [PATCH 6/6] subcmd: fix memory leak in parse_options_subcommand When subcommands are present and no usage string has been provided, parse_options_subcommand() builds a usage string via astrcat() and stores it in usagestr[0], but never frees it. The allocation leaks on every normal return path. Move the buf pointer to function scope and free it before returning. Fixes: Signed-off-by: Wang Haoran --- tools/lib/subcmd/parse-options.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/tools/lib/subcmd/parse-options.c b/tools/lib/subcmd/parse-option= s.c index 555d617c1..1eb8053e8 100644 --- a/tools/lib/subcmd/parse-options.c +++ b/tools/lib/subcmd/parse-options.c @@ -633,10 +633,10 @@ int parse_options_subcommand(int argc, const char **arg= v, const struct option *o const char *const subcommands[], const char *usagestr[], int flags) { struct parse_opt_ctx_t ctx; + char *buf =3D NULL; =20 /* build usage string if it's not provided */ if (subcommands && !usagestr[0]) { - char *buf =3D NULL; =20 astrcatf(&buf, "%s %s [] {", subcmd_config.exec_name, argv[0]); =20 @@ -680,6 +680,7 @@ int parse_options_subcommand(int argc, const char **argv,= const struct option *o usage_with_options(usagestr, options); } =20 + free(buf); return parse_options_end(&ctx); } =20 --=20 2.53.0 --- ASan output on perf 7.0.6 (unpatched) with the attached PoC: Perf file header corrupt: header overlaps attrs incompatible file format (rerun with -v to learn more) Perf session creation failed. =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D55949=3D=3DERROR: LeakSanitizer: detected memory leaks Direct leak of 73 byte(s) in 1 object(s) allocated from: #0 0x77ab3032b60f in malloc ../../../../src/libsanitizer/asan/asan_malloc= _linux.cpp:67 #1 0x77ab2ee96e6e in __vasprintf_internal libio/vasprintf.c:116 #2 0x77ab2ef43172 in ___asprintf_chk debug/asprintf_chk.c:34 #3 0x568d03932ee3 in asprintf /usr/include/x86_64-linux-gnu/bits/stdio2.h= :206 #4 0x568d03932ee3 in astrcat=20 #5 0x568d03932ee3 in parse_options_subcommand=20 #6 0x568d038cdef0 in cmd_sched (perf+0x33eef0) (BuildId: 25d667fa7a727404= 6cb5bcb3375c4b1074f3f6db) #7 0x568d0391287f in handle_internal_command (perf+0x38387f) (BuildId: 25= d667fa7a7274046cb5bcb3375c4b1074f3f6db) #8 0x568d03785836 in main (perf+0x1f6836) (BuildId: 25d667fa7a7274046cb5b= cb3375c4b1074f3f6db) #9 0x77ab2ee2a600 in __libc_start_call_main ../sysdeps/nptl/libc_start_ca= ll_main.h:59 #10 0x77ab2ee2a717 in __libc_start_main_impl ../csu/libc-start.c:360 #11 0x568d0378d754 in _start (perf+0x1fe754) (BuildId: 25d667fa7a7274046c= b5bcb3375c4b1074f3f6db) Objects leaked above: 0x741b2e1e0800 (73 bytes) SUMMARY: AddressSanitizer: 73 byte(s) leaked in 1 allocation(s). --===============7114621159298678336== Content-Type: application/octet-stream Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="crash_err255_iter46.data" MIME-Version: 1.0 UEVSRklMRTJoAP8AAAAAAKAAAAAAAAAAaAAAAAAAAAAAAAAAAAAAAGgAAAAAAAAAYAQAAAAAAAAA AAAAAAAAAAAAAAAAAAAA+G9QAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABVAAAAAABIAPR5 ZAABAAAAAAAAABEAAACbGAAAAAAAABgpDQDjGAQA2I0GAJAkBQCRZKWOlQAAAIZL/v5FAAAAerYk 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