diff options
| author | Chenggang Qin <chenggang.qcg@taobao.com> | 2013-10-11 08:27:57 +0800 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2013-10-14 12:21:23 -0300 |
| commit | 784f3390f9bd900adfb3b0373615e105a0d9749a (patch) | |
| tree | da35f0ffc970ef9b1348ae9179c5cde2843d68f9 | |
| parent | d4f74eb89199dc7bde5579783e9188841e1271e3 (diff) | |
perf symbols: Fix a mmap and munmap mismatched bug
In function filename__read_debuglink(), while the ELF file is opend and
mmapped in elf_begin(), but if this file is considered to not be usable
during the following code, we will goto the close(fd) directly. The
elf_end() is skipped. So, the mmaped ELF file cannot be munmapped. The
mmapped areas exist during the life of perf.
This is a memory leak. This patch fixed this bug.
Reviewed-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Chenggang Qin <chenggang.qcg@taobao.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Chenggang Qin <chenggang.qcg@taobao.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: Yanmin Zhang <yanmin.zhang@intel.com>
Link: http://lkml.kernel.org/r/1381451279-4109-1-git-send-email-chenggang.qin@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| -rw-r--r-- | tools/perf/util/symbol-elf.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c index d6b8af3ce34..eed0b96302a 100644 --- a/tools/perf/util/symbol-elf.c +++ b/tools/perf/util/symbol-elf.c @@ -487,27 +487,27 @@ int filename__read_debuglink(const char *filename, char *debuglink, ek = elf_kind(elf); if (ek != ELF_K_ELF) - goto out_close; + goto out_elf_end; if (gelf_getehdr(elf, &ehdr) == NULL) { pr_err("%s: cannot get elf header.\n", __func__); - goto out_close; + goto out_elf_end; } sec = elf_section_by_name(elf, &ehdr, &shdr, ".gnu_debuglink", NULL); if (sec == NULL) - goto out_close; + goto out_elf_end; data = elf_getdata(sec, NULL); if (data == NULL) - goto out_close; + goto out_elf_end; /* the start of this section is a zero-terminated string */ strncpy(debuglink, data->d_buf, size); +out_elf_end: elf_end(elf); - out_close: close(fd); out: |