linux-kernel - Re: [PATCH] perf unwind: Fix uninitialized variable

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Message-ID: <CA+icZUW-Zrri=ofkdVtNNYcBCQ-cNvLt7GHfcJw54bxzf_zjZA@mail.gmail.com>
Date:   Tue, 7 Jun 2022 20:12:52 +0200
From:   Sedat Dilek <sedat.dilek@...il.com>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, Fangrui Song <maskray@...gle.com>,
        Sebastian Ullrich <sebasti@...lri.ch>
Subject: Re: [PATCH] perf unwind: Fix uninitialized variable

On Tue, Jun 7, 2022 at 2:09 AM Ian Rogers <irogers@...gle.com> wrote:
>
> ret may be uninitialized on error goto paths.
>
> Reported-by: Sedat Dilek <sedat.dilek@...il.com>
> Fixes: dc2cf4ca866f ("perf unwind: Fix segbase for ld.lld linked objects")
> Signed-off-by: Ian Rogers <irogers@...gle.com>

Thanks for the patch.

Feel free to add my:

Tested-by: Sedat Dilek <sedat.dilek@...il.com>

$ LC_ALL=C ll ~/bin/perf
-rwxr-xr-x 2 dileks dileks 16M Jun  7 20:10 /home/dileks/bin/perf

$ ~/bin/perf -vv
perf version 5.19.0-rc1
                dwarf: [ on  ]  # HAVE_DWARF_SUPPORT
   dwarf_getlocations: [ on  ]  # HAVE_DWARF_GETLOCATIONS_SUPPORT
                glibc: [ on  ]  # HAVE_GLIBC_SUPPORT
        syscall_table: [ on  ]  # HAVE_SYSCALL_TABLE_SUPPORT
               libbfd: [ on  ]  # HAVE_LIBBFD_SUPPORT
           debuginfod: [ OFF ]  # HAVE_DEBUGINFOD_SUPPORT
               libelf: [ on  ]  # HAVE_LIBELF_SUPPORT
              libnuma: [ on  ]  # HAVE_LIBNUMA_SUPPORT
numa_num_possible_cpus: [ on  ]  # HAVE_LIBNUMA_SUPPORT
              libperl: [ on  ]  # HAVE_LIBPERL_SUPPORT
            libpython: [ on  ]  # HAVE_LIBPYTHON_SUPPORT
             libslang: [ on  ]  # HAVE_SLANG_SUPPORT
            libcrypto: [ on  ]  # HAVE_LIBCRYPTO_SUPPORT
            libunwind: [ on  ]  # HAVE_LIBUNWIND_SUPPORT
   libdw-dwarf-unwind: [ on  ]  # HAVE_DWARF_SUPPORT
                 zlib: [ on  ]  # HAVE_ZLIB_SUPPORT
                 lzma: [ on  ]  # HAVE_LZMA_SUPPORT
            get_cpuid: [ on  ]  # HAVE_AUXTRACE_SUPPORT
                  bpf: [ on  ]  # HAVE_LIBBPF_SUPPORT
                  aio: [ on  ]  # HAVE_AIO_SUPPORT
                 zstd: [ on  ]  # HAVE_ZSTD_SUPPORT
              libpfm4: [ OFF ]  # HAVE_LIBPFM

-Sedat-

> ---
>  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..6e5b8cce47bf 100644
> --- a/tools/perf/util/unwind-libunwind-local.c
> +++ b/tools/perf/util/unwind-libunwind-local.c
> @@ -174,7 +174,7 @@ static int elf_section_address_and_offset(int fd, const char *name, u64 *address
>         Elf *elf;
>         GElf_Ehdr ehdr;
>         GElf_Shdr shdr;
> -       int ret;
> +       int ret = -1;
>
>         elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL);
>         if (elf == NULL)
> --
> 2.36.1.255.ge46751e96f-goog
>