[PATCH v3 2/4] selinux: replace some BUG_ON()s with a WARN_ON()

[Ondrej Mosnacek]

We don't need to crash the machine in these cases. Let's just detect the
buggy state early and error out with a warning.

Signed-off-by: Ondrej Mosnacek <omosnace at redhat.com>
---
 security/selinux/avc.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/security/selinux/avc.c b/security/selinux/avc.c
index 502162eeb3a0..5ebad47391c9 100644
--- a/security/selinux/avc.c
+++ b/security/selinux/avc.c
@@ -678,7 +678,6 @@ static void avc_audit_pre_callback(struct audit_buffer *ab, void *a)
 		return;
 	}
 
-	BUG_ON(!sad->tclass || sad->tclass >= ARRAY_SIZE(secclass_map));
 	perms = secclass_map[sad->tclass-1].perms;
 
 	audit_log_string(ab, " {");
@@ -731,7 +730,6 @@ static void avc_audit_post_callback(struct audit_buffer *ab, void *a)
 		kfree(scontext);
 	}
 
-	BUG_ON(!sad->tclass || sad->tclass >= ARRAY_SIZE(secclass_map));
 	audit_log_format(ab, " tclass=%s", secclass_map[sad->tclass-1].name);
 
 	if (sad->denied)
@@ -748,6 +746,9 @@ noinline int slow_avc_audit(struct selinux_state *state,
 	struct common_audit_data stack_data;
 	struct selinux_audit_data sad;
 
+	if (WARN_ON(!tclass || tclass >= ARRAY_SIZE(secclass_map)))
+		return -EINVAL;
+
 	if (!a) {
 		a = &stack_data;
 		a->type = LSM_AUDIT_DATA_NONE;
-- 
2.20.1