Re: [PATCH] perf unwind: Fix uninitialized variable

Sedat Dilek
2022-06-07T20:28:37Z

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

Thanks for the patch.

Feel free to add my:

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