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Diffstat (limited to 'kernel/cred.c')
-rw-r--r--kernel/cred.c26
1 files changed, 15 insertions, 11 deletions
diff --git a/kernel/cred.c b/kernel/cred.c
index 98cb4eca23fb..9398e534b997 100644
--- a/kernel/cred.c
+++ b/kernel/cred.c
@@ -162,23 +162,29 @@ EXPORT_SYMBOL(__put_cred);
*/
void exit_creds(struct task_struct *tsk)
{
- struct cred *cred;
+ struct cred *real_cred, *cred;
kdebug("exit_creds(%u,%p,%p,{%d,%d})", tsk->pid, tsk->real_cred, tsk->cred,
atomic_read(&tsk->cred->usage),
read_cred_subscribers(tsk->cred));
- cred = (struct cred *) tsk->real_cred;
+ real_cred = (struct cred *) tsk->real_cred;
tsk->real_cred = NULL;
- validate_creds(cred);
- alter_cred_subscribers(cred, -1);
- put_cred(cred);
cred = (struct cred *) tsk->cred;
tsk->cred = NULL;
+
validate_creds(cred);
- alter_cred_subscribers(cred, -1);
- put_cred(cred);
+ if (real_cred == cred) {
+ alter_cred_subscribers(cred, -2);
+ put_cred_many(cred, 2);
+ } else {
+ validate_creds(real_cred);
+ alter_cred_subscribers(real_cred, -1);
+ put_cred(real_cred);
+ alter_cred_subscribers(cred, -1);
+ put_cred(cred);
+ }
#ifdef CONFIG_KEYS_REQUEST_CACHE
key_put(tsk->cached_requested_key);
@@ -355,8 +361,7 @@ int copy_creds(struct task_struct *p, unsigned long clone_flags)
#endif
clone_flags & CLONE_THREAD
) {
- p->real_cred = get_cred(p->cred);
- get_cred(p->cred);
+ p->real_cred = get_cred_many(p->cred, 2);
alter_cred_subscribers(p->cred, 2);
kdebug("share_creds(%p{%d,%d})",
p->cred, atomic_read(&p->cred->usage),
@@ -520,8 +525,7 @@ int commit_creds(struct cred *new)
proc_id_connector(task, PROC_EVENT_GID);
/* release the old obj and subj refs both */
- put_cred(old);
- put_cred(old);
+ put_cred_many(old, 2);
return 0;
}
EXPORT_SYMBOL(commit_creds);