linux-kernel - Re: [PATCH] perf unwind: fix unitialized offset on aarch64

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Message-ID: <YsA3nmwXyLfN4OQA@kernel.org>
Date:   Sat, 2 Jul 2022 09:18:38 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ivan Babrou <ivan@...udflare.com>
Cc:     linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...udflare.com, Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        James Clark <james.clark@....com>,
        Ian Rogers <irogers@...gle.com>,
        Fangrui Song <maskray@...gle.com>
Subject: Re: [PATCH] perf unwind: fix unitialized offset on aarch64

Em Fri, Jul 01, 2022 at 11:20:46AM -0700, Ivan Babrou escreveu:
> Commit dc2cf4ca866f uncovered the following issue on aarch64:
> 
>     util/unwind-libunwind-local.c: In function 'find_proc_info':
>     util/unwind-libunwind-local.c:386:28: error: 'offset' may be used uninitialized in this function [-Werror=maybe-uninitialized]
>     386 |                         if (ofs > 0) {
>         |                            ^
>     util/unwind-libunwind-local.c:199:22: note: 'offset' was declared here
>     199 |         u64 address, offset;
>         |                      ^~~~~~
>     util/unwind-libunwind-local.c:371:20: error: 'offset' may be used uninitialized in this function [-Werror=maybe-uninitialized]
>     371 |                 if (ofs <= 0) {
>         |                    ^
>     util/unwind-libunwind-local.c:199:22: note: 'offset' was declared here
>     199 |         u64 address, offset;
>         |                      ^~~~~~
>     util/unwind-libunwind-local.c:363:20: error: 'offset' may be used uninitialized in this function [-Werror=maybe-uninitialized]
>     363 |                 if (ofs <= 0) {
>         |                    ^
>     util/unwind-libunwind-local.c:199:22: note: 'offset' was declared here
>     199 |         u64 address, offset;
>         |                      ^~~~~~
>     In file included from util/libunwind/arm64.c:37:

Thanks, applied.

- Arnaldo

 
> Signed-off-by: Ivan Babrou <ivan@...udflare.com>
> Fixes: dc2cf4ca866f
> ---
>  tools/perf/util/unwind-libunwind-local.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/unwind-libunwind-local.c b/tools/perf/util/unwind-libunwind-local.c
> index 37622699c91a..eaa8fa4b34f3 100644
> --- a/tools/perf/util/unwind-libunwind-local.c
> +++ b/tools/perf/util/unwind-libunwind-local.c
> @@ -197,7 +197,7 @@ static int elf_section_address_and_offset(int fd, const char *name, u64 *address
>  #ifndef NO_LIBUNWIND_DEBUG_FRAME
>  static u64 elf_section_offset(int fd, const char *name)
>  {
> -	u64 address, offset;
> +	u64 address, offset = 0;
>  
>  	if (elf_section_address_and_offset(fd, name, &address, &offset))
>  		return 0;
> -- 
> 2.36.1

-- 

- Arnaldo