perf kmaps: Check kmaps to make code more robust
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>
diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
index 476268c..a7ab606 100644
--- a/tools/perf/util/symbol-elf.c
+++ b/tools/perf/util/symbol-elf.c
@@ -776,6 +776,7 @@
symbol_filter_t filter, int kmodule)
{
struct kmap *kmap = dso->kernel ? map__kmap(map) : NULL;
+ struct map_groups *kmaps = kmap ? map__kmaps(map) : NULL;
struct map *curr_map = map;
struct dso *curr_dso = dso;
Elf_Data *symstrs, *secstrs;
@@ -791,6 +792,9 @@
int nr = 0;
bool remap_kernel = false, adjust_kernel_syms = false;
+ if (kmap && !kmaps)
+ return -1;
+
dso->symtab_type = syms_ss->type;
dso->is_64_bit = syms_ss->is_64_bit;
dso->rel = syms_ss->ehdr.e_type == ET_REL;
@@ -958,8 +962,10 @@
map->map_ip = map__map_ip;
map->unmap_ip = map__unmap_ip;
/* Ensure maps are correctly ordered */
- map_groups__remove(kmap->kmaps, map);
- map_groups__insert(kmap->kmaps, map);
+ if (kmaps) {
+ map_groups__remove(kmaps, map);
+ map_groups__insert(kmaps, map);
+ }
}
/*
@@ -983,7 +989,7 @@
snprintf(dso_name, sizeof(dso_name),
"%s%s", dso->short_name, section_name);
- curr_map = map_groups__find_by_name(kmap->kmaps, map->type, dso_name);
+ curr_map = map_groups__find_by_name(kmaps, map->type, dso_name);
if (curr_map == NULL) {
u64 start = sym.st_value;
@@ -1013,7 +1019,7 @@
curr_map->unmap_ip = identity__map_ip;
}
curr_dso->symtab_type = dso->symtab_type;
- map_groups__insert(kmap->kmaps, curr_map);
+ map_groups__insert(kmaps, curr_map);
/*
* The new DSO should go to the kernel DSOS
*/
@@ -1075,7 +1081,7 @@
* We need to fixup this here too because we create new
* maps here, for things like vsyscall sections.
*/
- __map_groups__fixup_end(kmap->kmaps, map->type);
+ __map_groups__fixup_end(kmaps, map->type);
}
}
err = nr;