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| author | Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> | 2014-04-02 14:48:31 +0900 |
|---|---|---|
| committer | Jiri Olsa <jolsa@redhat.com> | 2014-04-14 12:55:39 +0200 |
| commit | 182c228ebcf1ac67a44e62236d8f7a8a9a3c5699 (patch) | |
| tree | 04034d6fc1965cd58f13101770045fb961a48dfc /tools/perf/util/probe-finder.c | |
| parent | 202c7c123c96a1c193149b7fa2718d7fb143efb2 (diff) | |
| download | linux-182c228ebcf1ac67a44e62236d8f7a8a9a3c5699.tar.bz2 | |
perf probe: Fix to handle errors in line_range searching
As Namhyung reported(https://lkml.org/lkml/2014/4/1/89),
current perf-probe -L option doesn't handle errors in line-range
searching correctly. It causes a SEGV if an error occured in the
line-range searching.
----
$ perf probe -x ./perf -v -L map__load
Open Debuginfo file: /home/namhyung/project/linux/tools/perf/perf
fname: util/map.c, lineno:153
New line range: 153 to 2147483647
path: (null)
Segmentation fault (core dumped)
----
This is because line_range_inline_cb() ignores errors
from find_line_range_by_line() which means that lr->path is
already freed on the error path in find_line_range_by_line().
As a result, get_real_path() accesses the lr->path and it
causes a NULL pointer exception.
This fixes line_range_inline_cb() to handle the error correctly,
and report it to the caller.
Anyway, this just fixes a possible SEGV bug, Namhyung's patch
is also required.
Reported-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20140402054831.19080.27006.stgit@ltc230.yrl.intra.hitachi.co.jp
Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Diffstat (limited to 'tools/perf/util/probe-finder.c')
| -rw-r--r-- | tools/perf/util/probe-finder.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c index 3bf0c8cdccb7..fae274e72fe6 100644 --- a/tools/perf/util/probe-finder.c +++ b/tools/perf/util/probe-finder.c @@ -1475,14 +1475,15 @@ static int find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf) static int line_range_inline_cb(Dwarf_Die *in_die, void *data) { - find_line_range_by_line(in_die, data); + int ret = find_line_range_by_line(in_die, data); /* * We have to check all instances of inlined function, because * some execution paths can be optimized out depends on the - * function argument of instances + * function argument of instances. However, if an error occurs, + * it should be handled by the caller. */ - return 0; + return ret < 0 ? ret : 0; } /* Search function definition from function name */ |