From b21cc97810932a551f7aac46f0b89c469c828b3f Mon Sep 17 00:00:00 2001 From: Milian Wolff Date: Wed, 24 May 2017 15:21:24 +0900 Subject: [PATCH] perf report: Fix memory leak in addr2line when called by addr2inlines When a filename was found in addr2line it was duplicated via strdup() but never freed. Now we pass NULL and handle this gracefully in addr2line. Detected by Valgrind: ==16331== 1,680 bytes in 21 blocks are definitely lost in loss record 148 of 220 ==16331== at 0x4C2AF1F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) ==16331== by 0x672FA69: strdup (in /usr/lib/libc-2.25.so) ==16331== by 0x52769F: addr2line (srcline.c:256) ==16331== by 0x52769F: addr2inlines (srcline.c:294) ==16331== by 0x52769F: dso__parse_addr_inlines (srcline.c:502) ==16331== by 0x574D7A: inline__fprintf (hist.c:41) ==16331== by 0x574D7A: ipchain__fprintf_graph (hist.c:147) ==16331== by 0x57518A: __callchain__fprintf_graph (hist.c:212) ==16331== by 0x5753CF: callchain__fprintf_graph.constprop.6 (hist.c:337) ==16331== by 0x57738E: hist_entry__fprintf (hist.c:628) ==16331== by 0x57738E: hists__fprintf (hist.c:882) ==16331== by 0x44A20F: perf_evlist__tty_browse_hists (builtin-report.c:399) ==16331== by 0x44A20F: report__browse_hists (builtin-report.c:491) ==16331== by 0x44A20F: __cmd_report (builtin-report.c:624) ==16331== by 0x44A20F: cmd_report (builtin-report.c:1054) ==16331== by 0x4A49CE: run_builtin (perf.c:296) ==16331== by 0x4A4CC0: handle_internal_command (perf.c:348) ==16331== by 0x434371: run_argv (perf.c:392) ==16331== by 0x434371: main (perf.c:530) Signed-off-by: Milian Wolff Signed-off-by: Namhyung Kim Cc: Arnaldo Carvalho de Melo Cc: Arnaldo Carvalho de Melo Cc: David Ahern Cc: Jiri Olsa Cc: Jiri Olsa Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: Yao Jin Cc: kernel-team@lge.com Link: http://lkml.kernel.org/r/20170524062129.32529-3-namhyung@kernel.org Signed-off-by: Ingo Molnar --- tools/perf/util/srcline.c | 23 +++++++++++++---------- 1 file changed, 13 insertions(+), 10 deletions(-) diff --git a/tools/perf/util/srcline.c b/tools/perf/util/srcline.c index df051a52393c..5e376d64d59e 100644 --- a/tools/perf/util/srcline.c +++ b/tools/perf/util/srcline.c @@ -230,7 +230,10 @@ static int addr2line(const char *dso_name, u64 addr, bfd_map_over_sections(a2l->abfd, find_address_in_section, a2l); - if (a2l->found && unwind_inlines) { + if (!a2l->found) + return 0; + + if (unwind_inlines) { int cnt = 0; while (bfd_find_inliner_info(a2l->abfd, &a2l->filename, @@ -243,6 +246,8 @@ static int addr2line(const char *dso_name, u64 addr, a2l->line, node, dso) != 0) return 0; + // found at least one inline frame + ret = 1; } } @@ -252,14 +257,14 @@ static int addr2line(const char *dso_name, u64 addr, } } - if (a2l->found && a2l->filename) { - *file = strdup(a2l->filename); - *line = a2l->line; - - if (*file) - ret = 1; + if (file) { + *file = a2l->filename ? strdup(a2l->filename) : NULL; + ret = *file ? 1 : 0; } + if (line) + *line = a2l->line; + return ret; } @@ -278,8 +283,6 @@ void dso__free_a2l(struct dso *dso) static struct inline_node *addr2inlines(const char *dso_name, u64 addr, struct dso *dso) { - char *file = NULL; - unsigned int line = 0; struct inline_node *node; node = zalloc(sizeof(*node)); @@ -291,7 +294,7 @@ static struct inline_node *addr2inlines(const char *dso_name, u64 addr, INIT_LIST_HEAD(&node->val); node->addr = addr; - if (!addr2line(dso_name, addr, &file, &line, dso, TRUE, node)) + if (!addr2line(dso_name, addr, NULL, NULL, dso, TRUE, node)) goto out_free_inline_node; if (list_empty(&node->val)) -- 2.20.1