From 73081c61b2919185ccff748e074ba3e3bc663aa2 Mon Sep 17 00:00:00 2001
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From: Arnaldo Carvalho de Melo <acme@redhat.com>
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Date: Mon, 2 Mar 2020 11:55:47 -0300
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Subject: [PATCH 2/7] perf parse-events: Use asprintf() instead of strncpy() to
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read tracepoint files
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Make the code more compact by using asprintf() instead of malloc()+strncpy() which also uses
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less memory and avoids these warnings with gcc 10:
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CC /tmp/build/perf/util/cloexec.o
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In file included from /usr/include/string.h:495,
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from util/parse-events.h:12,
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from util/parse-events.c:18:
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In function ‘strncpy’,
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inlined from ‘tracepoint_id_to_path’ at util/parse-events.c:271:5:
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/usr/include/bits/string_fortified.h:106:10: error: ‘__builtin_strncpy’ offset [275, 511] from the object at ‘sys_dirent’ is out of the bounds of referenced subobject ‘d_name’ with type ‘char[256]’ at offset 19 [-Werror=array-bounds]
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106 | return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
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| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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In file included from /usr/include/dirent.h:61,
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from util/parse-events.c:5:
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util/parse-events.c: In function ‘tracepoint_id_to_path’:
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/usr/include/bits/dirent.h:33:10: note: subobject ‘d_name’ declared here
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33 | char d_name[256]; /* We must not include limits.h! */
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| ^~~~~~
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In file included from /usr/include/string.h:495,
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from util/parse-events.h:12,
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from util/parse-events.c:18:
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In function ‘strncpy’,
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inlined from ‘tracepoint_id_to_path’ at util/parse-events.c:273:5:
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/usr/include/bits/string_fortified.h:106:10: error: ‘__builtin_strncpy’ offset [275, 511] from the object at ‘evt_dirent’ is out of the bounds of referenced subobject ‘d_name’ with type ‘char[256]’ at offset 19 [-Werror=array-bounds]
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106 | return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
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| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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In file included from /usr/include/dirent.h:61,
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from util/parse-events.c:5:
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util/parse-events.c: In function ‘tracepoint_id_to_path’:
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/usr/include/bits/dirent.h:33:10: note: subobject ‘d_name’ declared here
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33 | char d_name[256]; /* We must not include limits.h! */
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| ^~~~~~
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CC /tmp/build/perf/util/call-path.o
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Cc: Adrian Hunter <adrian.hunter@intel.com>
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Cc: Jiri Olsa <jolsa@kernel.org>
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Cc: Namhyung Kim <namhyung@kernel.org>
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Link: http://lore.kernel.org/lkml/20200302145535.GA28183@kernel.org
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Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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(cherry picked from commit 7125f204501ed55493593209c6c71ac7c38f6b6c)
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Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
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---
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tools/perf/util/parse-events.c | 10 ++--------
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1 file changed, 2 insertions(+), 8 deletions(-)
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diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
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index 0eff0c3ba9ee..e8afb6264692 100644
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--- a/tools/perf/util/parse-events.c
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+++ b/tools/perf/util/parse-events.c
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@@ -223,21 +223,15 @@ struct tracepoint_path *tracepoint_id_to_path(u64 config)
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path = zalloc(sizeof(*path));
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if (!path)
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return NULL;
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- path->system = malloc(MAX_EVENT_LENGTH);
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- if (!path->system) {
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+ if (asprintf(&path->system, "%.*s", MAX_EVENT_LENGTH, sys_dirent->d_name) < 0) {
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free(path);
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return NULL;
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}
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- path->name = malloc(MAX_EVENT_LENGTH);
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- if (!path->name) {
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+ if (asprintf(&path->name, "%.*s", MAX_EVENT_LENGTH, evt_dirent->d_name) < 0) {
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zfree(&path->system);
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free(path);
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return NULL;
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}
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- strncpy(path->system, sys_dirent->d_name,
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- MAX_EVENT_LENGTH);
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- strncpy(path->name, evt_dirent->d_name,
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- MAX_EVENT_LENGTH);
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return path;
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}
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}
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--
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2.20.1
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