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perf kmaps: Check kmaps to make code more robust

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This patch add checks in places where map__kmap is used to get kmaps
from struct kmap.

Error messages are added at map__kmap to warn invalid accessing of kmap
(for the case of !map->dso->kernel, kmap(map) does not exists at all).

Also, introduces map__kmaps() to warn uninitialized kmaps.

Reviewed-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: pi3orama@163.com
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Zefan Li <lizefan@huawei.com>
Link: http://lkml.kernel.org/r/1428394966-131044-2-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Wang Nan 2015-04-07 08:22:45 +00:00 • committed by Arnaldo Carvalho de Melo
parent 8ea92ceb74
commit ba92732e98
7 changed files with 70 additions and 16 deletions
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5
tools/perf/util/machine.c
View file

@ -679,6 +679,9 @@ int __machine__create_kernel_maps(struct machine *machine, struct dso *kernel)
machine->vmlinux_maps[type]->unmap_ip =
identity__map_ip;
kmap = map__kmap(machine->vmlinux_maps[type]);
if (!kmap)
return -1;
kmap->kmaps = &machine->kmaps;
map_groups__insert(&machine->kmaps,
machine->vmlinux_maps[type]);
@ -700,7 +703,7 @@ void machine__destroy_kernel_maps(struct machine *machine)
kmap = map__kmap(machine->vmlinux_maps[type]);
map_groups__remove(&machine->kmaps,
machine->vmlinux_maps[type]);
if (kmap->ref_reloc_sym) {
if (kmap && kmap->ref_reloc_sym) {
/*
* ref_reloc_sym is shared among all maps, so free just
* on one of them.