diff options
| author | Sowmini Varadhan <sowmini.varadhan@oracle.com> | 2015-10-26 12:46:37 -0400 |
|---|---|---|
| committer | Willy Tarreau <w@1wt.eu> | 2015-12-06 00:49:18 +0100 |
| commit | f7e7c28af2e7243bc0afce71cf6d6d70e9c7720b (patch) | |
| tree | 867c0f7de8d685cd37c824451140183fa25c895a | |
| parent | 7f5cb247c1e54bf6d1b41e743dc2cebd58420a49 (diff) | |
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: Ben Hutchings <ben@decadent.org.uk>
(cherry picked from commit f114d9374ba3e42c86b112c8b4dbcba50a7330e7)
Signed-off-by: Willy Tarreau <w@1wt.eu>
| -rw-r--r-- | net/rds/tcp_recv.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/net/rds/tcp_recv.c b/net/rds/tcp_recv.c index c00dafffbb5a..43d9d66aa150 100644 --- a/net/rds/tcp_recv.c +++ b/net/rds/tcp_recv.c @@ -233,8 +233,15 @@ 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)) { + printk(KERN_WARNING "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 -> " |