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-rw-r--r--security/smack/smack_lsm.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 6777295f4b2b..e96080eaacbb 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -2227,6 +2227,9 @@ static int smack_task_kill(struct task_struct *p, struct siginfo *info,
struct smack_known *tkp = smk_of_task_struct(p);
int rc;
+ if (!sig)
+ return 0; /* null signal; existence test */
+
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
smk_ad_setfield_u_tsk(&ad, p);
/*