lkml.org 
[lkml]   [2019]   [Sep]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Date
SubjectRe: [PATCH] perf llvm: don't access out-of-scope array
Em Thu, Sep 26, 2019 at 03:00:18PM -0700, Ian Rogers escreveu:
> test_dir is assigned to the release array which is out-of-scope 3 lines
> later. Extend the scope of the release array so that an out-of-scope
> array isn't accessed.
> Bug detected by clang's address sanitizer.

This one is really ironic, code to support using clang/llvm in perf is
caught with a bug detected by clang's utilities ;-)

Please next time try to use 'git blame' so as to add this:

[root@quaco perf]# git tag --contains 07bc5c699a3d | grep ^v[[:digit:]] | sort --version-sort | head -1
v4.4
[root@quaco perf]#

Cc: Wang Nan <wangnan0@huawei.com>
Cc: stable@vger.kernel.org # v4.4+
Fixes: 07bc5c699a3d ("perf tools: Make fetch_kernel_version() publicly available")

And help get noticed by the various backport bots out there.

Thanks a lot, applied!

- Arnaldo

> Signed-off-by: Ian Rogers <irogers@google.com>
> ---
> tools/perf/util/llvm-utils.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/tools/perf/util/llvm-utils.c b/tools/perf/util/llvm-utils.c
> index 8d04e3d070b1..8b14e4a7f1dc 100644
> --- a/tools/perf/util/llvm-utils.c
> +++ b/tools/perf/util/llvm-utils.c
> @@ -233,14 +233,14 @@ static int detect_kbuild_dir(char **kbuild_dir)
> const char *prefix_dir = "";
> const char *suffix_dir = "";
>
> + /* _UTSNAME_LENGTH is 65 */
> + char release[128];
> +
> char *autoconf_path;
>
> int err;
>
> if (!test_dir) {
> - /* _UTSNAME_LENGTH is 65 */
> - char release[128];
> -
> err = fetch_kernel_version(NULL, release,
> sizeof(release));
> if (err)
> --
> 2.23.0.444.g18eeb5a265-goog

--

- Arnaldo

\
 
 \ /
  Last update: 2019-09-27 17:27    [W:0.040 / U:27.012 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site