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

Daniel Borkmann says:

====================
pull-request: bpf 2021-06-23

The following pull-request contains BPF updates for your *net* tree.

We've added 14 non-merge commits during the last 6 day(s) which contain
a total of 13 files changed, 137 insertions(+), 64 deletions(-).

Note that when you merge net into net-next, there is a small merge conflict
between 9f2470fbc4cb ("skmsg: Improve udp_bpf_recvmsg() accuracy") from bpf
with c49661aa6f70 ("skmsg: Remove unused parameters of sk_msg_wait_data()")
from net-next. Resolution is to: i) net/ipv4/udp_bpf.c: take udp_msg_wait_data()
and remove err parameter from the function, ii) net/ipv4/tcp_bpf.c: take
tcp_msg_wait_data() and remove err parameter from the function, iii) for
net/core/skmsg.c and include/linux/skmsg.h: remove the sk_msg_wait_data()
implementation and its prototype in header.

The main changes are:

1) Fix BPF poke descriptor adjustments after insn rewrite, from John Fastabend.

2) Fix regression when using BPF_OBJ_GET with non-O_RDWR flags, from Maciej Żenczykowski.

3) Various bug and error handling fixes for UDP-related sock_map, from Cong Wang.

4) Fix patching of vmlinux BTF IDs with correct endianness, from Tony Ambardar.

5) Two fixes for TX descriptor validation in AF_XDP, from Magnus Karlsson.

6) Fix overflow in size calculation for bpf_map_area_alloc(), from Bui Quang Minh.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 2 deletions

diff --git a/include/net/xsk_buff_pool.h b/include/net/xsk_buff_pool.h
index eaa8386dbc63..7a9a23e7a604 100644
--- a/include/net/xsk_buff_pool.h
+++ b/include/net/xsk_buff_pool.h
@@ -147,11 +147,16 @@ static inline bool xp_desc_crosses_non_contig_pg(struct xsk_buff_pool *pool,
 {
 	bool cross_pg = (addr & (PAGE_SIZE - 1)) + len > PAGE_SIZE;
 
-	if (pool->dma_pages_cnt && cross_pg) {
+	if (likely(!cross_pg))
+		return false;
+
+	if (pool->dma_pages_cnt) {
 		return !(pool->dma_pages[addr >> PAGE_SHIFT] &
 			 XSK_NEXT_PG_CONTIG_MASK);
 	}
-	return false;
+
+	/* skb path */
+	return addr + len > pool->addrs_cnt;
 }
 
 static inline u64 xp_aligned_extract_addr(struct xsk_buff_pool *pool, u64 addr)