perf script: Remove some large stack allocations

Some char buffers are stack allocated but in total they come to
24kb. Avoid Wstack-usage warnings by moving the arrays to being
dynamically allocated.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20230527034324.2597593-3-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index e3f435e..200b3e7 100644 (file)
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -3318,14 +3318,21 @@ static int list_available_scripts(const struct option *opt __maybe_unused,
                                  int unset __maybe_unused)
 {
        struct dirent *script_dirent, *lang_dirent;
-       char scripts_path[MAXPATHLEN];
+       char *buf, *scripts_path, *script_path, *lang_path, *first_half;
        DIR *scripts_dir, *lang_dir;
-       char script_path[MAXPATHLEN];
-       char lang_path[MAXPATHLEN];
        struct script_desc *desc;
-       char first_half[BUFSIZ];
        char *script_root;
 
+       buf = malloc(3 * MAXPATHLEN + BUFSIZ);
+       if (!buf) {
+               pr_err("malloc failed\n");
+               exit(-1);
+       }
+       scripts_path = buf;
+       script_path = buf + MAXPATHLEN;
+       lang_path = buf + 2 * MAXPATHLEN;
+       first_half = buf + 3 * MAXPATHLEN;
+
        snprintf(scripts_path, MAXPATHLEN, "%s/scripts", get_argv_exec_path());
 
        scripts_dir = opendir(scripts_path);
@@ -3334,6 +3341,7 @@ static int list_available_scripts(const struct option *opt __maybe_unused,
                        "open(%s) failed.\n"
                        "Check \"PERF_EXEC_PATH\" env to set scripts dir.\n",
                        scripts_path);
+               free(buf);
                exit(-1);
        }
 
@@ -3364,6 +3372,7 @@ static int list_available_scripts(const struct option *opt __maybe_unused,
                        desc->half_liner ? desc->half_liner : "");
        }
 
+       free(buf);
        exit(0);
 }