diff --git a/sys/netsmb/smb_subr.c b/sys/netsmb/smb_subr.c
index 3ecfd8f406a3..ae21133fda06 100644
--- a/sys/netsmb/smb_subr.c
+++ b/sys/netsmb/smb_subr.c
@@ -75,11 +75,15 @@ smb_proc_intr(struct proc *p)
 
 	if (p == NULL)
 		return 0;
+	PROC_LOCK(p);
 	tmpset = p->p_siglist;
 	SIGSETNAND(tmpset, p->p_sigmask);
 	SIGSETNAND(tmpset, p->p_sigignore);
-	if (SIGNOTEMPTY(p->p_siglist) && SMB_SIGMASK(tmpset))
+	if (SIGNOTEMPTY(p->p_siglist) && SMB_SIGMASK(tmpset)) {
+		PROC_UNLOCK(p);
                 return EINTR;
+	}
+	PROC_UNLOCK(p);
 	return 0;
 }