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

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Date:   Wed, 8 Jun 2022 21:29:44 +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 8:12 PM Sedat Dilek <sedat.dilek@...il.com> wrote:
>
> 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>
>

If it is not too late, more exactly:

Tested-by: Sedat Dilek <sedat.dilek@...il.com> # LLVM-14 (x86-64)

-Sedat-

> $ 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
> >