Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf

Daniel Borkmann says:

====================
pull-request: bpf 2021-01-20

1) Fix wrong bpf_map_peek_elem_proto helper callback, from Mircea Cirjaliu.

2) Fix signed_{sub,add32}_overflows type truncation, from Daniel Borkmann.

3) Fix AF_XDP to also clear pools for inactive queues, from Maxim Mikityanskiy.

* https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf:
  bpf: Fix signed_{sub,add32}_overflows type handling
  xsk: Clear pool even for inactive queues
  bpf: Fix helper bpf_map_peek_elem_proto pointing to wrong callback
====================

Link: https://lore.kernel.org/r/20210120163439.8160-1-daniel@iogearbox.netSigned-off-by: Jakub Kicinski <kuba@kernel.org>

kernel/bpf/helpers.c

@@ -108,7 +108,7 @@ BPF_CALL_2(bpf_map_peek_elem, struct bpf_map *, map, void *, value)
 }
 
 const struct bpf_func_proto bpf_map_peek_elem_proto = {
-	.func		= bpf_map_pop_elem,
+	.func		= bpf_map_peek_elem,
 	.gpl_only	= false,
 	.ret_type	= RET_INTEGER,
 	.arg1_type	= ARG_CONST_MAP_PTR,

kernel/bpf/verifier.c

@@ -5313,7 +5313,7 @@ static bool signed_add_overflows(s64 a, s64 b)
 	return res < a;
 }
 
-static bool signed_add32_overflows(s64 a, s64 b)
+static bool signed_add32_overflows(s32 a, s32 b)
 {
 	/* Do the add in u32, where overflow is well-defined */
 	s32 res = (s32)((u32)a + (u32)b);
@@ -5323,7 +5323,7 @@ static bool signed_add32_overflows(s64 a, s64 b)
 	return res < a;
 }
 
-static bool signed_sub_overflows(s32 a, s32 b)
+static bool signed_sub_overflows(s64 a, s64 b)
 {
 	/* Do the sub in u64, where overflow is well-defined */
 	s64 res = (s64)((u64)a - (u64)b);
@@ -5335,7 +5335,7 @@ static bool signed_sub_overflows(s32 a, s32 b)
 
 static bool signed_sub32_overflows(s32 a, s32 b)
 {
-	/* Do the sub in u64, where overflow is well-defined */
+	/* Do the sub in u32, where overflow is well-defined */
 	s32 res = (s32)((u32)a - (u32)b);
 
 	if (b < 0)

net/xdp/xsk.c

@@ -108,9 +108,9 @@ EXPORT_SYMBOL(xsk_get_pool_from_qid);
 
 void xsk_clear_pool_at_qid(struct net_device *dev, u16 queue_id)
 {
-	if (queue_id < dev->real_num_rx_queues)
+	if (queue_id < dev->num_rx_queues)
 		dev->_rx[queue_id].pool = NULL;
-	if (queue_id < dev->real_num_tx_queues)
+	if (queue_id < dev->num_tx_queues)
 		dev->_tx[queue_id].pool = NULL;
 }