On 2015/12/10 13:52, Wang Nan wrote:
To prevent futher commits calling machine__delete() on non-allocated
'struct machine' (which would cause memory corruption), this patch
enforces machine__init(), record whether a machine structure is
dynamically allocated or not, and warn if machine__delete() is called
on incorrect object.
Signed-off-by: Wang Nan <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Cc: Namhyung Kim <[email protected]>
---
tools/perf/tests/vmlinux-kallsyms.c | 4 ++--
tools/perf/util/machine.c | 14 +++++++++-----
tools/perf/util/machine.h | 3 ++-
3 files changed, 13 insertions(+), 8 deletions(-)
diff --git a/tools/perf/tests/vmlinux-kallsyms.c
b/tools/perf/tests/vmlinux-kallsyms.c
index f0bfc9e..441e93d 100644
--- a/tools/perf/tests/vmlinux-kallsyms.c
+++ b/tools/perf/tests/vmlinux-kallsyms.c
@@ -35,8 +35,8 @@ int test__vmlinux_matches_kallsyms(int subtest __maybe_unused)
* Init the machines that will hold kernel, modules obtained from
* both vmlinux + .ko files and from /proc/kallsyms split by modules.
*/
- machine__init(&kallsyms, "", HOST_KERNEL_ID);
- machine__init(&vmlinux, "", HOST_KERNEL_ID);
+ machine__init(&kallsyms, "", HOST_KERNEL_ID, false);
+ machine__init(&vmlinux, "", HOST_KERNEL_ID, false);
/*
* Step 2:
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index f5882b8..a2b9b47 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -23,7 +23,7 @@ static void dsos__init(struct dsos *dsos)
pthread_rwlock_init(&dsos->lock, NULL);
}
-int machine__init(struct machine *machine, const char *root_dir, pid_t pid)
+int machine__init(struct machine *machine, const char *root_dir, pid_t pid,
bool allocated)
{
map_groups__init(&machine->kmaps, machine);
RB_CLEAR_NODE(&machine->rb_node);
@@ -64,6 +64,7 @@ int machine__init(struct machine *machine, const char
*root_dir, pid_t pid)
}
machine->current_tid = NULL;
+ machine->allocated = allocated;
return 0;
}
@@ -73,7 +74,7 @@ struct machine *machine__new_host(void)
struct machine *machine = malloc(sizeof(*machine));
if (machine != NULL) {
- machine__init(machine, "", HOST_KERNEL_ID);
+ machine__init(machine, "", HOST_KERNEL_ID, true);
if (machine__create_kernel_maps(machine) < 0)
goto out_delete;
@@ -136,12 +137,15 @@ void machine__exit(struct machine *machine)
void machine__delete(struct machine *machine)
{
machine__exit(machine);
- free(machine);
+ if (!machine->allocated)
Sorry, should be
if (machine->allocated)
Will send v2.
Thank you.
--
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