From: David Howells dhowells@redhat.com
[ Upstream commit 2ad6691d988c0c611362ddc2aad89e0fb50e3261 ]
There's a race between the retransmission code and the received ACK parser. The problem is that the retransmission loop has to drop the lock under which it is iterating through the transmission buffer in order to transmit a packet, but whilst the lock is dropped, the ACK parser can crank the Tx window round and discard the packets from the buffer.
The retransmission code then updated the annotations for the wrong packet and a later retransmission thought it had to retransmit a packet that wasn't there, leading to a NULL pointer dereference.
Fix this by:
(1) Moving the annotation change to before we drop the lock prior to transmission. This means we can't vary the annotation depending on the outcome of the transmission, but that's fine - we'll retransmit again later if it failed now.
(2) Skipping the packet if the skb pointer is NULL.
The following oops was seen:
BUG: kernel NULL pointer dereference, address: 000000000000002d Workqueue: krxrpcd rxrpc_process_call RIP: 0010:rxrpc_get_skb+0x14/0x8a ... Call Trace: rxrpc_resend+0x331/0x41e ? get_vtime_delta+0x13/0x20 rxrpc_process_call+0x3c0/0x4ac process_one_work+0x18f/0x27f worker_thread+0x1a3/0x247 ? create_worker+0x17d/0x17d kthread+0xe6/0xeb ? kthread_delayed_work_timer_fn+0x83/0x83 ret_from_fork+0x1f/0x30
Fixes: 248f219cb8bc ("rxrpc: Rewrite the data and ack handling code") Signed-off-by: David Howells dhowells@redhat.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- net/rxrpc/call_event.c | 29 +++++++++++------------------ 1 file changed, 11 insertions(+), 18 deletions(-)
diff --git a/net/rxrpc/call_event.c b/net/rxrpc/call_event.c index 2a65ac41055f5..985fb89202d0c 100644 --- a/net/rxrpc/call_event.c +++ b/net/rxrpc/call_event.c @@ -248,7 +248,18 @@ static void rxrpc_resend(struct rxrpc_call *call, unsigned long now_j) if (anno_type != RXRPC_TX_ANNO_RETRANS) continue;
+ /* We need to reset the retransmission state, but we need to do + * so before we drop the lock as a new ACK/NAK may come in and + * confuse things + */ + annotation &= ~RXRPC_TX_ANNO_MASK; + annotation |= RXRPC_TX_ANNO_RESENT; + call->rxtx_annotations[ix] = annotation; + skb = call->rxtx_buffer[ix]; + if (!skb) + continue; + rxrpc_get_skb(skb, rxrpc_skb_got); spin_unlock_bh(&call->lock);
@@ -262,24 +273,6 @@ static void rxrpc_resend(struct rxrpc_call *call, unsigned long now_j)
rxrpc_free_skb(skb, rxrpc_skb_freed); spin_lock_bh(&call->lock); - - /* We need to clear the retransmit state, but there are two - * things we need to be aware of: A new ACK/NAK might have been - * received and the packet might have been hard-ACK'd (in which - * case it will no longer be in the buffer). - */ - if (after(seq, call->tx_hard_ack)) { - annotation = call->rxtx_annotations[ix]; - anno_type = annotation & RXRPC_TX_ANNO_MASK; - if (anno_type == RXRPC_TX_ANNO_RETRANS || - anno_type == RXRPC_TX_ANNO_NAK) { - annotation &= ~RXRPC_TX_ANNO_MASK; - annotation |= RXRPC_TX_ANNO_UNACK; - } - annotation |= RXRPC_TX_ANNO_RESENT; - call->rxtx_annotations[ix] = annotation; - } - if (after(call->tx_hard_ack, seq)) seq = call->tx_hard_ack; }