From: Maxim Mikityanskiy <maximmi@mellanox.com>
Date: Fri, 15 Mar 2019 16:41:43 +0200
Subject: net/mlx5e: Fix use-after-free after xdp_return_frame
Patch-mainline: v5.1-rc7
Git-commit: 12fc512f5741443a03adde2ead20724da8ad550a
References: bsc#1103990 FATE#326006
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: 58b99ee3e3ebe ("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>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
@@ -207,9 +207,9 @@ bool mlx5e_poll_xdpsq_cq(struct mlx5e_cq
sqcc++;
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);
@@ -243,9 +243,9 @@ void mlx5e_free_xdpsq_descs(struct mlx5e
sq->cc++;
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);