[TCP] tcp_read_sock: Allow recv_actor() return return negative error value.

tcp_read_sock() currently assumes that the recv_actor() only returns
number of bytes copied. For network splice receive, we may have to
return an error in some cases. So allow the actor to return a negative
error value.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 2 deletions

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index cd3c7e95de9e..450f44bb2c8e 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -1064,7 +1064,11 @@ int tcp_read_sock(struct sock *sk, read_descriptor_t *desc,
                                         break;
                         }
                         used = recv_actor(desc, skb, offset, len);
-                        if (used <= len) {
+                        if (used < 0) {
+                                if (!copied)
+                                        copied = used;
+                                break;
+                        } else if (used <= len) {
                                 seq += used;
                                 copied += used;
                                 offset += used;
@@ -1086,7 +1090,7 @@ int tcp_read_sock(struct sock *sk, read_descriptor_t *desc,
         tcp_rcv_space_adjust(sk);
 
         /* Clean up data we have read: This will do ACK frames. */
-        if (copied)
+        if (copied > 0)
                 tcp_cleanup_rbuf(sk, copied);
         return copied;
 }