perf top: Delete the evlist before perf_session, fixing heap-use-after-free issue

The evlist should be destroyed before the perf session.

Detected with gcc's ASan:

  =================================================================
  ==27350==ERROR: AddressSanitizer: heap-use-after-free on address 0x62b000002e38 at pc 0x5611da276999 bp 0x7ffce8f1d1a0 sp 0x7ffce8f1d190
  WRITE of size 8 at 0x62b000002e38 thread T0
      #0 0x5611da276998 in __list_del /home/work/linux/tools/include/linux/list.h:89
      #1 0x5611da276d4a in __list_del_entry /home/work/linux/tools/include/linux/list.h:102
      #2 0x5611da276e77 in list_del_init /home/work/linux/tools/include/linux/list.h:145
      #3 0x5611da2781cd in thread__put util/thread.c:130
      #4 0x5611da2cc0a8 in __thread__zput util/thread.h:68
      #5 0x5611da2d2dcb in hist_entry__delete util/hist.c:1148
      #6 0x5611da2cdf91 in hists__delete_entry util/hist.c:337
      #7 0x5611da2ce19e in hists__delete_entries util/hist.c:365
      #8 0x5611da2db2ab in hists__delete_all_entries util/hist.c:2639
      #9 0x5611da2db325 in hists_evsel__exit util/hist.c:2651
      #10 0x5611da1c5352 in perf_evsel__exit util/evsel.c:1304
      #11 0x5611da1c5390 in perf_evsel__delete util/evsel.c:1309
      #12 0x5611da1b35f0 in perf_evlist__purge util/evlist.c:124
      #13 0x5611da1b38e2 in perf_evlist__delete util/evlist.c:148
      #14 0x5611da069781 in cmd_top /home/changbin/work/linux/tools/perf/builtin-top.c:1645
      #15 0x5611da17d038 in run_builtin /home/changbin/work/linux/tools/perf/perf.c:302
      #16 0x5611da17d577 in handle_internal_command /home/changbin/work/linux/tools/perf/perf.c:354
      #17 0x5611da17d97b in run_argv /home/changbin/work/linux/tools/perf/perf.c:398
      #18 0x5611da17e0e9 in main /home/changbin/work/linux/tools/perf/perf.c:520
      #19 0x7fdcc970f09a in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2409a)
      #20 0x5611d9ff35c9 in _start (/home/work/linux/tools/perf/perf+0x3e95c9)

  0x62b000002e38 is located 11320 bytes inside of 27448-byte region [0x62b000000200,0x62b000006d38)
  freed by thread T0 here:
      #0 0x7fdccb04ab70 in free (/usr/lib/x86_64-linux-gnu/libasan.so.5+0xedb70)
      #1 0x5611da260df4 in perf_session__delete util/session.c:201
      #2 0x5611da063de5 in __cmd_top /home/changbin/work/linux/tools/perf/builtin-top.c:1300
      #3 0x5611da06973c in cmd_top /home/changbin/work/linux/tools/perf/builtin-top.c:1642
      #4 0x5611da17d038 in run_builtin /home/changbin/work/linux/tools/perf/perf.c:302
      #5 0x5611da17d577 in handle_internal_command /home/changbin/work/linux/tools/perf/perf.c:354
      #6 0x5611da17d97b in run_argv /home/changbin/work/linux/tools/perf/perf.c:398
      #7 0x5611da17e0e9 in main /home/changbin/work/linux/tools/perf/perf.c:520
      #8 0x7fdcc970f09a in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2409a)

  previously allocated by thread T0 here:
      #0 0x7fdccb04b138 in calloc (/usr/lib/x86_64-linux-gnu/libasan.so.5+0xee138)
      #1 0x5611da26010c in zalloc util/util.h:23
      #2 0x5611da260824 in perf_session__new util/session.c:118
      #3 0x5611da0633a6 in __cmd_top /home/changbin/work/linux/tools/perf/builtin-top.c:1192
      #4 0x5611da06973c in cmd_top /home/changbin/work/linux/tools/perf/builtin-top.c:1642
      #5 0x5611da17d038 in run_builtin /home/changbin/work/linux/tools/perf/perf.c:302
      #6 0x5611da17d577 in handle_internal_command /home/changbin/work/linux/tools/perf/perf.c:354
      #7 0x5611da17d97b in run_argv /home/changbin/work/linux/tools/perf/perf.c:398
      #8 0x5611da17e0e9 in main /home/changbin/work/linux/tools/perf/perf.c:520
      #9 0x7fdcc970f09a in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2409a)

  SUMMARY: AddressSanitizer: heap-use-after-free /home/work/linux/tools/include/linux/list.h:89 in __list_del
  Shadow bytes around the buggy address:
    0x0c567fff8570: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
    0x0c567fff8580: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
    0x0c567fff8590: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
    0x0c567fff85a0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
    0x0c567fff85b0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  =>0x0c567fff85c0: fd fd fd fd fd fd fd[fd]fd fd fd fd fd fd fd fd
    0x0c567fff85d0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
    0x0c567fff85e0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
    0x0c567fff85f0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
    0x0c567fff8600: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
    0x0c567fff8610: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  Shadow byte legend (one shadow byte represents 8 application bytes):
    Addressable:           00
    Partially addressable: 01 02 03 04 05 06 07
    Heap left redzone:       fa
    Freed heap region:       fd
    Stack left redzone:      f1
    Stack mid redzone:       f2
    Stack right redzone:     f3
    Stack after return:      f5
    Stack use after scope:   f8
    Global redzone:          f9
    Global init order:       f6
    Poisoned by user:        f7
    Container overflow:      fc
    Array cookie:            ac
    Intra object redzone:    bb
    ASan internal:           fe
    Left alloca redzone:     ca
    Right alloca redzone:    cb
  ==27350==ABORTING
Signed-off-by: Changbin Du <changbin.du@gmail.com>
Reviewed-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/20190316080556.3075-8-changbin.du@gmail.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-top.c

@@ -1189,23 +1189,19 @@ static int __cmd_top(struct perf_top *top)
 	pthread_t thread, thread_process;
 	int ret;
 
-	top->session = perf_session__new(NULL, false, NULL);
-	if (top->session == NULL)
-		return -1;
-
 	if (!top->annotation_opts.objdump_path) {
 		ret = perf_env__lookup_objdump(&top->session->header.env,
 					       &top->annotation_opts.objdump_path);
 		if (ret)
-			goto out_delete;
+			return ret;
 	}
 
 	ret = callchain_param__setup_sample_type(&callchain_param);
 	if (ret)
-		goto out_delete;
+		return ret;
 
 	if (perf_session__register_idle_thread(top->session) < 0)
-		goto out_delete;
+		return ret;
 
 	if (top->nr_threads_synthesize > 1)
 		perf_set_multithreaded();
@@ -1227,13 +1223,18 @@ static int __cmd_top(struct perf_top *top)
 
 	if (perf_hpp_list.socket) {
 		ret = perf_env__read_cpu_topology_map(&perf_env);
-		if (ret < 0)
-			goto out_err_cpu_topo;
+		if (ret < 0) {
+			char errbuf[BUFSIZ];
+			const char *err = str_error_r(-ret, errbuf, sizeof(errbuf));
+
+			ui__error("Could not read the CPU topology map: %s\n", err);
+			return ret;
+		}
 	}
 
 	ret = perf_top__start_counters(top);
 	if (ret)
-		goto out_delete;
+		return ret;
 
 	top->session->evlist = top->evlist;
 	perf_session__set_id_hdr_size(top->session);
@@ -1252,7 +1253,7 @@ static int __cmd_top(struct perf_top *top)
 	ret = -1;
 	if (pthread_create(&thread_process, NULL, process_thread, top)) {
 		ui__error("Could not create process thread.\n");
-		goto out_delete;
+		return ret;
 	}
 
 	if (pthread_create(&thread, NULL, (use_browser > 0 ? display_thread_tui :
@@ -1296,19 +1297,7 @@ static int __cmd_top(struct perf_top *top)
 out_join_thread:
 	pthread_cond_signal(&top->qe.cond);
 	pthread_join(thread_process, NULL);
-out_delete:
-	perf_session__delete(top->session);
-	top->session = NULL;
-
 	return ret;
-
-out_err_cpu_topo: {
-	char errbuf[BUFSIZ];
-	const char *err = str_error_r(-ret, errbuf, sizeof(errbuf));
-
-	ui__error("Could not read the CPU topology map: %s\n", err);
-	goto out_delete;
-}
 }
 
 static int
@@ -1639,10 +1628,17 @@ int cmd_top(int argc, const char **argv)
 		signal(SIGWINCH, winch_sig);
 	}
 
+	top.session = perf_session__new(NULL, false, NULL);
+	if (top.session == NULL) {
+		status = -1;
+		goto out_delete_evlist;
+	}
+
 	status = __cmd_top(&top);
 
 out_delete_evlist:
 	perf_evlist__delete(top.evlist);
+	perf_session__delete(top.session);
 
 	return status;
 }