RDS-TCP: Recover correctly from pskb_pull()/pksb_trim() failure in rds_tcp_data_recv
Either of pskb_pull() or pskb_trim() may fail under low memory conditions.
If rds_tcp_data_recv() ignores such failures, the application will
receive corrupted data because the skb has not been correctly
carved to the RDS datagram size.
Avoid this by handling pskb_pull/pskb_trim failure in the same
manner as the skb_clone failure: bail out of rds_tcp_data_recv(), and
retry via the deferred call to rds_send_worker() that gets set up on
ENOMEM from rds_tcp_read_sock()
Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/rds/tcp_recv.c b/net/rds/tcp_recv.c
index fbc5ef8..27a9921 100644
--- a/net/rds/tcp_recv.c
+++ b/net/rds/tcp_recv.c
@@ -214,8 +214,15 @@
}
to_copy = min(tc->t_tinc_data_rem, left);
- pskb_pull(clone, offset);
- pskb_trim(clone, to_copy);
+ if (!pskb_pull(clone, offset) ||
+ pskb_trim(clone, to_copy)) {
+ pr_warn("rds_tcp_data_recv: pull/trim failed "
+ "left %zu data_rem %zu skb_len %d\n",
+ left, tc->t_tinc_data_rem, skb->len);
+ kfree_skb(clone);
+ desc->error = -ENOMEM;
+ goto out;
+ }
skb_queue_tail(&tinc->ti_skb_list, clone);
rdsdebug("skb %p data %p len %d off %u to_copy %zu -> "