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| author | Ilya Maximets <i.maximets@samsung.com> | 2019-07-04 17:25:03 +0300 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2019-07-12 14:54:57 +0200 |
| commit | 675716400da6f15b9d3db04ef74ee74ca9a00af3 (patch) | |
| tree | be8b1b96c494923785d8a8de31cb84e4d0e27d49 /net | |
| parent | 36db2a94f19ae1fcf1e6d8253df0c32f90f92860 (diff) | |
| download | linux-675716400da6f15b9d3db04ef74ee74ca9a00af3.tar.gz linux-675716400da6f15b9d3db04ef74ee74ca9a00af3.tar.bz2 linux-675716400da6f15b9d3db04ef74ee74ca9a00af3.zip | |
xdp: fix possible cq entry leak
Completion queue address reservation could not be undone.
In case of bad 'queue_id' or skb allocation failure, reserved entry
will be leaked reducing the total capacity of completion queue.
Fix that by moving reservation to the point where failure is not
possible. Additionally, 'queue_id' checking moved out from the loop
since there is no point to check it there.
Fixes: 35fcde7f8deb ("xsk: support for Tx")
Signed-off-by: Ilya Maximets <i.maximets@samsung.com>
Acked-by: Björn Töpel <bjorn.topel@intel.com>
Tested-by: William Tu <u9012063@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/xdp/xsk.c | 11 |
1 files changed, 4 insertions, 7 deletions
diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c index d4d6f10aa936..b994c32a664a 100644 --- a/net/xdp/xsk.c +++ b/net/xdp/xsk.c @@ -240,6 +240,9 @@ static int xsk_generic_xmit(struct sock *sk, struct msghdr *m, mutex_lock(&xs->mutex); + if (xs->queue_id >= xs->dev->real_num_tx_queues) + goto out; + while (xskq_peek_desc(xs->tx, &desc)) { char *buffer; u64 addr; @@ -250,12 +253,6 @@ static int xsk_generic_xmit(struct sock *sk, struct msghdr *m, goto out; } - if (xskq_reserve_addr(xs->umem->cq)) - goto out; - - if (xs->queue_id >= xs->dev->real_num_tx_queues) - goto out; - len = desc.len; skb = sock_alloc_send_skb(sk, len, 1, &err); if (unlikely(!skb)) { @@ -267,7 +264,7 @@ static int xsk_generic_xmit(struct sock *sk, struct msghdr *m, addr = desc.addr; buffer = xdp_umem_get_data(xs->umem, addr); err = skb_store_bits(skb, 0, buffer, len); - if (unlikely(err)) { + if (unlikely(err) || xskq_reserve_addr(xs->umem->cq)) { kfree_skb(skb); goto out; } |