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tools lib bpf: Check return value of strdup when reading map names 

Commit 561bbccac7 ("tools lib bpf:
Extract and collect map names from BPF object file") forgets checking
return value of strdup(). This patch fixes it. It also checks names
pointer before strcmp() for safety.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Fixes: 561bbccac7 ("tools lib bpf: Extract and collect map names from BPF object file")
Link: http://lkml.kernel.org/r/1449541544-67621-2-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Wang Nan 2015-12-08 02:25:29 +00:00 committed by Arnaldo Carvalho de Melo
parent beefb8d0e5
commit 973170e667
1 changed files with 9 additions and 4 deletions
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13
tools/lib/bpf/libbpf.c
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@ -527,14 +527,14 @@ bpf_object__init_maps(struct bpf_object *obj, void *data,
return 0;
}
static void
static int
bpf_object__init_maps_name(struct bpf_object *obj, int maps_shndx)
{
int i;
Elf_Data *symbols = obj->efile.symbols;
if (!symbols || maps_shndx < 0)
return;
return -EINVAL;
for (i = 0; i < symbols->d_size / sizeof(GElf_Sym); i++) {
GElf_Sym sym;
@ -556,9 +556,14 @@ bpf_object__init_maps_name(struct bpf_object *obj, int maps_shndx)
continue;
}
obj->maps[map_idx].name = strdup(map_name);
if (!obj->maps[map_idx].name) {
pr_warning("failed to alloc map name\n");
return -ENOMEM;
}
pr_debug("map %zu is \"%s\"\n", map_idx,
obj->maps[map_idx].name);
}
return 0;
}
static int bpf_object__elf_collect(struct bpf_object *obj)
@ -663,7 +668,7 @@ static int bpf_object__elf_collect(struct bpf_object *obj)
}
if (maps_shndx >= 0)
bpf_object__init_maps_name(obj, maps_shndx);
err = bpf_object__init_maps_name(obj, maps_shndx);
out:
return err;
}
@ -1372,7 +1377,7 @@ bpf_object__get_map_by_name(struct bpf_object *obj, const char *name)
struct bpf_map *pos;
bpf_map__for_each(pos, obj) {
if (strcmp(pos->name, name) == 0)
if (pos->name && !strcmp(pos->name, name))
return pos;
}
return NULL;