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RDS-TCP: Recover correctly from pskb_pull()/pksb_trim() failure in rds_tcp_data_recv 

[ Upstream commit 8ce675ff39b9958d1c10f86cf58e357efaafc856 ]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sowmini Varadhan 2015-10-26 12:46:37 -04:00 committed by Greg Kroah-Hartman
parent e42f6b5c7b
commit 074043fdd0
1 changed files with 9 additions and 2 deletions
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11
net/rds/tcp_recv.c
View File

@ -234,8 +234,15 @@ static int rds_tcp_data_recv(read_descriptor_t *desc, struct sk_buff *skb,
}
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 -> "