[PATCH v10 08/12] net, arm64: untag user pointers in tcp_zerocopy_receive

[Andrey Konovalov]

tcp_zerocopy_receive() uses provided user pointers for vma lookups, which
can only by done with untagged pointers.

Untag user pointers in this function.

Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
---
 net/ipv4/tcp.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index cf3c5095c10e..80f3c1fb9809 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -1756,6 +1756,8 @@ static int tcp_zerocopy_receive(struct sock *sk,
 	int inq;
 	int ret;
 
+	address = untagged_addr(address);
+
 	if (address & (PAGE_SIZE - 1) || address != zc->address)
 		return -EINVAL;
 
-- 
2.21.0.rc0.258.g878e2cd30e-goog