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net/mlx5e: Fix use-after-free after xdp_return_frame

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xdp_return_frame releases the frame. It leads to releasing the page, so
it's not allowed to access xdpi.xdpf->len after that, because xdpi.xdpf
is at xdp->data_hard_start after convert_to_xdp_frame. This patch moves
the memory access to precede the return of the frame.

Fixes: 58b99ee3e3 ("net/mlx5e: Add support for XDP_REDIRECT in device-out side")
Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
This commit is contained in:
Maxim Mikityanskiy 2019-03-15 16:41:43 +02:00 committed by Saeed Mahameed
parent 36ad702253
commit 12fc512f57
1 changed files with 2 additions and 2 deletions
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4
drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
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@ -304,9 +304,9 @@ bool mlx5e_poll_xdpsq_cq(struct mlx5e_cq *cq, struct mlx5e_rq *rq)
mlx5e_xdpi_fifo_pop(xdpi_fifo);
if (is_redirect) {
xdp_return_frame(xdpi.xdpf);
dma_unmap_single(sq->pdev, xdpi.dma_addr,
xdpi.xdpf->len, DMA_TO_DEVICE);
xdp_return_frame(xdpi.xdpf);
} else {
/* Recycle RX page */
mlx5e_page_release(rq, &xdpi.di, true);
@ -345,9 +345,9 @@ void mlx5e_free_xdpsq_descs(struct mlx5e_xdpsq *sq, struct mlx5e_rq *rq)
mlx5e_xdpi_fifo_pop(xdpi_fifo);
if (is_redirect) {
xdp_return_frame(xdpi.xdpf);
dma_unmap_single(sq->pdev, xdpi.dma_addr,
xdpi.xdpf->len, DMA_TO_DEVICE);
xdp_return_frame(xdpi.xdpf);
} else {
/* Recycle RX page */
mlx5e_page_release(rq, &xdpi.di, false);