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Subject[PATCH] staging: fsl-dpaa2/eth: Fix incorrect kfree
Date
Use netdev_alloc_frag() instead of kmalloc to allocate space for
the S/G table of egress multi-buffer frames.

This fixes a bug where an unaligned pointer received from the
allocator would be overwritten with the 64B aligned value,
leading to a wrong address being later passed to kfree.

Signed-off-by: Ioana Radulescu <ruxandra.radulescu@nxp.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
---
drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c b/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c
index c81a01f..f013af6 100644
--- a/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c
+++ b/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c
@@ -374,12 +374,14 @@ static int build_sg_fd(struct dpaa2_eth_priv *priv,
/* Prepare the HW SGT structure */
sgt_buf_size = priv->tx_data_offset +
sizeof(struct dpaa2_sg_entry) * (1 + num_dma_bufs);
- sgt_buf = kzalloc(sgt_buf_size + DPAA2_ETH_TX_BUF_ALIGN, GFP_ATOMIC);
+ sgt_buf = netdev_alloc_frag(sgt_buf_size + DPAA2_ETH_TX_BUF_ALIGN);
if (unlikely(!sgt_buf)) {
err = -ENOMEM;
goto sgt_buf_alloc_failed;
}
sgt_buf = PTR_ALIGN(sgt_buf, DPAA2_ETH_TX_BUF_ALIGN);
+ memset(sgt_buf, 0, sgt_buf_size);
+
sgt = (struct dpaa2_sg_entry *)(sgt_buf + priv->tx_data_offset);

/* Fill in the HW SGT structure.
@@ -421,7 +423,7 @@ static int build_sg_fd(struct dpaa2_eth_priv *priv,
return 0;

dma_map_single_failed:
- kfree(sgt_buf);
+ skb_free_frag(sgt_buf);
sgt_buf_alloc_failed:
dma_unmap_sg(dev, scl, num_sg, DMA_BIDIRECTIONAL);
dma_map_sg_failed:
@@ -525,9 +527,9 @@ static void free_tx_fd(const struct dpaa2_eth_priv *priv,
return;
}

- /* Free SGT buffer kmalloc'ed on tx */
+ /* Free SGT buffer allocated on tx */
if (fd_format != dpaa2_fd_single)
- kfree(skbh);
+ skb_free_frag(skbh);

/* Move on with skb release */
dev_kfree_skb(skb);
--
2.7.4
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