Commit be0e6266 authored by Namhyung Kim's avatar Namhyung Kim Committed by Greg Kroah-Hartman

perf namespace: Protect reading thread's namespace

[ Upstream commit 6584140ba9e6762dd7ec73795243289b914f31f9 ]

It seems that the current code lacks holding the namespace lock in
thread__namespaces().  Otherwise it can see inconsistent results.
Signed-off-by: 's avatarNamhyung Kim <namhyung@kernel.org>
Cc: Hari Bathini <hbathini@linux.vnet.ibm.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Krister Johansen <kjlx@templeofstupid.com>
Link: http://lkml.kernel.org/r/20190522053250.207156-2-namhyung@kernel.orgSigned-off-by: 's avatarArnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: 's avatarSasha Levin <sashal@kernel.org>
parent 7d523e33
......@@ -128,7 +128,7 @@ void thread__put(struct thread *thread)
}
}
struct namespaces *thread__namespaces(const struct thread *thread)
static struct namespaces *__thread__namespaces(const struct thread *thread)
{
if (list_empty(&thread->namespaces_list))
return NULL;
......@@ -136,10 +136,21 @@ struct namespaces *thread__namespaces(const struct thread *thread)
return list_first_entry(&thread->namespaces_list, struct namespaces, list);
}
struct namespaces *thread__namespaces(const struct thread *thread)
{
struct namespaces *ns;
down_read((struct rw_semaphore *)&thread->namespaces_lock);
ns = __thread__namespaces(thread);
up_read((struct rw_semaphore *)&thread->namespaces_lock);
return ns;
}
static int __thread__set_namespaces(struct thread *thread, u64 timestamp,
struct namespaces_event *event)
{
struct namespaces *new, *curr = thread__namespaces(thread);
struct namespaces *new, *curr = __thread__namespaces(thread);
new = namespaces__new(event);
if (!new)
......
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