diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index f40606a85a0f..eab3cf5399f5 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -357,7 +357,7 @@ BPF_CFLAGS = -g -Werror -D__TARGET_ARCH_$(SRCARCH) $(MENDIAN) 		\
 	     -I$(abspath $(OUTPUT)/../usr/include)
 
 CLANG_CFLAGS = $(CLANG_SYS_INCLUDES) \
-	       -Wno-compare-distinct-pointer-types
+	       -Wno-compare-distinct-pointer-types -Wuninitialized
 
 $(OUTPUT)/test_l4lb_noinline.o: BPF_CFLAGS += -fno-inline
 $(OUTPUT)/test_xdp_noinline.o: BPF_CFLAGS += -fno-inline
diff --git a/tools/testing/selftests/bpf/progs/rbtree.c b/tools/testing/selftests/bpf/progs/rbtree.c
index e5db1a4287e5..4c90aa6abddd 100644
--- a/tools/testing/selftests/bpf/progs/rbtree.c
+++ b/tools/testing/selftests/bpf/progs/rbtree.c
@@ -75,7 +75,7 @@ SEC("tc")
 long rbtree_add_and_remove(void *ctx)
 {
 	struct bpf_rb_node *res = NULL;
-	struct node_data *n, *m;
+	struct node_data *n, *m = NULL;
 
 	n = bpf_obj_new(typeof(*n));
 	if (!n)
diff --git a/tools/testing/selftests/bpf/progs/rbtree_fail.c b/tools/testing/selftests/bpf/progs/rbtree_fail.c
index bf3cba115897..4614cd7bfa46 100644
--- a/tools/testing/selftests/bpf/progs/rbtree_fail.c
+++ b/tools/testing/selftests/bpf/progs/rbtree_fail.c
@@ -232,8 +232,9 @@ long rbtree_api_first_release_unlock_escape(void *ctx)
 
 	bpf_spin_lock(&glock);
 	res = bpf_rbtree_first(&groot);
-	if (res)
-		n = container_of(res, struct node_data, node);
+	if (!res)
+		return 1;
+	n = container_of(res, struct node_data, node);
 	bpf_spin_unlock(&glock);
 
 	bpf_spin_lock(&glock);
diff --git a/tools/testing/selftests/bpf/progs/test_kfunc_dynptr_param.c b/tools/testing/selftests/bpf/progs/test_kfunc_dynptr_param.c
index 2fbef3cc7ad8..2dde8e3fe4c9 100644
--- a/tools/testing/selftests/bpf/progs/test_kfunc_dynptr_param.c
+++ b/tools/testing/selftests/bpf/progs/test_kfunc_dynptr_param.c
@@ -48,7 +48,7 @@ SEC("?lsm.s/bpf")
 __failure __msg("arg#0 expected pointer to stack or dynptr_ptr")
 int BPF_PROG(not_ptr_to_stack, int cmd, union bpf_attr *attr, unsigned int size)
 {
-	unsigned long val;
+	unsigned long val = 0;
 
 	return bpf_verify_pkcs7_signature((struct bpf_dynptr *)val,
 					  (struct bpf_dynptr *)val, NULL);
diff --git a/tools/testing/selftests/bpf/progs/test_sk_lookup_kern.c b/tools/testing/selftests/bpf/progs/test_sk_lookup_kern.c
index b502e5c92e33..6ccf6d546074 100644
--- a/tools/testing/selftests/bpf/progs/test_sk_lookup_kern.c
+++ b/tools/testing/selftests/bpf/progs/test_sk_lookup_kern.c
@@ -23,8 +23,8 @@ static struct bpf_sock_tuple *get_tuple(void *data, __u64 nh_off,
 					bool *ipv4)
 {
 	struct bpf_sock_tuple *result;
+	__u64 ihl_len = 0;
 	__u8 proto = 0;
-	__u64 ihl_len;
 
 	if (eth_proto == bpf_htons(ETH_P_IP)) {
 		struct iphdr *iph = (struct iphdr *)(data + nh_off);
diff --git a/tools/testing/selftests/bpf/progs/test_tunnel_kern.c b/tools/testing/selftests/bpf/progs/test_tunnel_kern.c
index 508da4a23c4f..95b4aa0928ba 100644
--- a/tools/testing/selftests/bpf/progs/test_tunnel_kern.c
+++ b/tools/testing/selftests/bpf/progs/test_tunnel_kern.c
@@ -324,11 +324,11 @@ int ip4ip6erspan_get_tunnel(struct __sk_buff *skb)
 SEC("tc")
 int vxlan_set_tunnel_dst(struct __sk_buff *skb)
 {
-	int ret;
 	struct bpf_tunnel_key key;
 	struct vxlan_metadata md;
 	__u32 index = 0;
 	__u32 *local_ip = NULL;
+	int ret = 0;
 
 	local_ip = bpf_map_lookup_elem(&local_ip_map, &index);
 	if (!local_ip) {
@@ -363,11 +363,11 @@ int vxlan_set_tunnel_dst(struct __sk_buff *skb)
 SEC("tc")
 int vxlan_set_tunnel_src(struct __sk_buff *skb)
 {
-	int ret;
 	struct bpf_tunnel_key key;
 	struct vxlan_metadata md;
 	__u32 index = 0;
 	__u32 *local_ip = NULL;
+	int ret = 0;
 
 	local_ip = bpf_map_lookup_elem(&local_ip_map, &index);
 	if (!local_ip) {
@@ -494,9 +494,9 @@ SEC("tc")
 int ip6vxlan_set_tunnel_dst(struct __sk_buff *skb)
 {
 	struct bpf_tunnel_key key;
-	int ret;
 	__u32 index = 0;
 	__u32 *local_ip;
+	int ret = 0;
 
 	local_ip = bpf_map_lookup_elem(&local_ip_map, &index);
 	if (!local_ip) {
@@ -525,9 +525,9 @@ SEC("tc")
 int ip6vxlan_set_tunnel_src(struct __sk_buff *skb)
 {
 	struct bpf_tunnel_key key;
-	int ret;
 	__u32 index = 0;
 	__u32 *local_ip;
+	int ret = 0;
 
 	local_ip = bpf_map_lookup_elem(&local_ip_map, &index);
 	if (!local_ip) {
@@ -556,9 +556,9 @@ SEC("tc")
 int ip6vxlan_get_tunnel_src(struct __sk_buff *skb)
 {
 	struct bpf_tunnel_key key;
-	int ret;
 	__u32 index = 0;
 	__u32 *local_ip;
+	int ret = 0;
 
 	local_ip = bpf_map_lookup_elem(&local_ip_map, &index);
 	if (!local_ip) {
