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-rw-r--r--kernel/user.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/kernel/user.c b/kernel/user.c
index 6408c0424291..220e586127a0 100644
--- a/kernel/user.c
+++ b/kernel/user.c
@@ -187,6 +187,17 @@ void switch_uid(struct user_struct *new_user)
187 atomic_dec(&old_user->processes); 187 atomic_dec(&old_user->processes);
188 switch_uid_keyring(new_user); 188 switch_uid_keyring(new_user);
189 current->user = new_user; 189 current->user = new_user;
190
191 /*
192 * We need to synchronize with __sigqueue_alloc()
193 * doing a get_uid(p->user).. If that saw the old
194 * user value, we need to wait until it has exited
195 * its critical region before we can free the old
196 * structure.
197 */
198 smp_mb();
199 spin_unlock_wait(&current->sighand->siglock);
200
190 free_uid(old_user); 201 free_uid(old_user);
191 suid_keys(current); 202 suid_keys(current);
192} 203}