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Date: Thu, 29 Mar 2018 16:22:37 +0900
From: Ji-Hun Kim <ji_hun.kim@...sung.com>
To: gregkh@...uxfoundation.org, baijiaju1990@...il.com,
forest@...ttletooquiet.net
Cc: dartnorris@...il.com, santhameena13@...il.com,
julia.lawall@...6.fr, ji_hun.kim@...sung.com, y.k.oh@...sung.com,
devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
kernel-janitors@...r.kernel.org
Subject: [PATCH v2] staging: vt6655: check for memory allocation failures
There are no null pointer checking on rd_info and td_info values which
are allocated by kzalloc. It has potential null pointer dereferencing
issues. Add return when allocation is failed.
Signed-off-by: Ji-Hun Kim <ji_hun.kim@...sung.com>
---
Change: since v1:
- Delete WARN_ON which can makes crashes on some machines.
- Instead of return directly, goto freeing function for freeing previously
allocated memory in the for loop after kzalloc() failed.
- In the freeing function, if td_info and rd_info are not allocated, no
needs to free.
drivers/staging/vt6655/device_main.c | 64 +++++++++++++++++++++++++-----------
1 file changed, 44 insertions(+), 20 deletions(-)
diff --git a/drivers/staging/vt6655/device_main.c b/drivers/staging/vt6655/device_main.c
index fbc4bc6..ecbba43 100644
--- a/drivers/staging/vt6655/device_main.c
+++ b/drivers/staging/vt6655/device_main.c
@@ -539,7 +539,8 @@ static void device_init_rd0_ring(struct vnt_private *priv)
i ++, curr += sizeof(struct vnt_rx_desc)) {
desc = &priv->aRD0Ring[i];
desc->rd_info = kzalloc(sizeof(*desc->rd_info), GFP_KERNEL);
-
+ if (!desc->rd_info)
+ goto error;
if (!device_alloc_rx_buf(priv, desc))
dev_err(&priv->pcid->dev, "can not alloc rx bufs\n");
@@ -550,6 +551,10 @@ static void device_init_rd0_ring(struct vnt_private *priv)
if (i > 0)
priv->aRD0Ring[i-1].next_desc = cpu_to_le32(priv->rd0_pool_dma);
priv->pCurrRD[0] = &priv->aRD0Ring[0];
+
+ return;
+error:
+ device_free_rd0_ring(priv);
}
static void device_init_rd1_ring(struct vnt_private *priv)
@@ -563,7 +568,8 @@ static void device_init_rd1_ring(struct vnt_private *priv)
i ++, curr += sizeof(struct vnt_rx_desc)) {
desc = &priv->aRD1Ring[i];
desc->rd_info = kzalloc(sizeof(*desc->rd_info), GFP_KERNEL);
-
+ if (!desc->rd_info)
+ goto error;
if (!device_alloc_rx_buf(priv, desc))
dev_err(&priv->pcid->dev, "can not alloc rx bufs\n");
@@ -574,6 +580,10 @@ static void device_init_rd1_ring(struct vnt_private *priv)
if (i > 0)
priv->aRD1Ring[i-1].next_desc = cpu_to_le32(priv->rd1_pool_dma);
priv->pCurrRD[1] = &priv->aRD1Ring[0];
+
+ return;
+error:
+ device_free_rd1_ring(priv);
}
static void device_free_rd0_ring(struct vnt_private *priv)
@@ -584,12 +594,12 @@ static void device_free_rd0_ring(struct vnt_private *priv)
struct vnt_rx_desc *desc = &priv->aRD0Ring[i];
struct vnt_rd_info *rd_info = desc->rd_info;
- dma_unmap_single(&priv->pcid->dev, rd_info->skb_dma,
- priv->rx_buf_sz, DMA_FROM_DEVICE);
-
- dev_kfree_skb(rd_info->skb);
-
- kfree(desc->rd_info);
+ if (rd_info) {
+ dma_unmap_single(&priv->pcid->dev, rd_info->skb_dma,
+ priv->rx_buf_sz, DMA_FROM_DEVICE);
+ dev_kfree_skb(rd_info->skb);
+ kfree(desc->rd_info);
+ }
}
}
@@ -601,12 +611,12 @@ static void device_free_rd1_ring(struct vnt_private *priv)
struct vnt_rx_desc *desc = &priv->aRD1Ring[i];
struct vnt_rd_info *rd_info = desc->rd_info;
- dma_unmap_single(&priv->pcid->dev, rd_info->skb_dma,
- priv->rx_buf_sz, DMA_FROM_DEVICE);
-
- dev_kfree_skb(rd_info->skb);
-
- kfree(desc->rd_info);
+ if (rd_info) {
+ dma_unmap_single(&priv->pcid->dev, rd_info->skb_dma,
+ priv->rx_buf_sz, DMA_FROM_DEVICE);
+ dev_kfree_skb(rd_info->skb);
+ kfree(desc->rd_info);
+ }
}
}
@@ -621,7 +631,8 @@ static void device_init_td0_ring(struct vnt_private *priv)
i++, curr += sizeof(struct vnt_tx_desc)) {
desc = &priv->apTD0Rings[i];
desc->td_info = kzalloc(sizeof(*desc->td_info), GFP_KERNEL);
-
+ if (!desc->td_info)
+ goto error;
desc->td_info->buf = priv->tx0_bufs + i * PKT_BUF_SZ;
desc->td_info->buf_dma = priv->tx_bufs_dma0 + i * PKT_BUF_SZ;
@@ -632,6 +643,10 @@ static void device_init_td0_ring(struct vnt_private *priv)
if (i > 0)
priv->apTD0Rings[i-1].next_desc = cpu_to_le32(priv->td0_pool_dma);
priv->apTailTD[0] = priv->apCurrTD[0] = &priv->apTD0Rings[0];
+
+ return;
+error:
+ device_free_td0_ring(priv);
}
static void device_init_td1_ring(struct vnt_private *priv)
@@ -646,7 +661,8 @@ static void device_init_td1_ring(struct vnt_private *priv)
i++, curr += sizeof(struct vnt_tx_desc)) {
desc = &priv->apTD1Rings[i];
desc->td_info = kzalloc(sizeof(*desc->td_info), GFP_KERNEL);
-
+ if (!desc->td_info)
+ goto error;
desc->td_info->buf = priv->tx1_bufs + i * PKT_BUF_SZ;
desc->td_info->buf_dma = priv->tx_bufs_dma1 + i * PKT_BUF_SZ;
@@ -657,6 +673,10 @@ static void device_init_td1_ring(struct vnt_private *priv)
if (i > 0)
priv->apTD1Rings[i-1].next_desc = cpu_to_le32(priv->td1_pool_dma);
priv->apTailTD[1] = priv->apCurrTD[1] = &priv->apTD1Rings[0];
+
+ return;
+error:
+ device_free_td1_ring(priv);
}
static void device_free_td0_ring(struct vnt_private *priv)
@@ -667,8 +687,10 @@ static void device_free_td0_ring(struct vnt_private *priv)
struct vnt_tx_desc *desc = &priv->apTD0Rings[i];
struct vnt_td_info *td_info = desc->td_info;
- dev_kfree_skb(td_info->skb);
- kfree(desc->td_info);
+ if (td_info) {
+ dev_kfree_skb(td_info->skb);
+ kfree(desc->td_info);
+ }
}
}
@@ -680,8 +702,10 @@ static void device_free_td1_ring(struct vnt_private *priv)
struct vnt_tx_desc *desc = &priv->apTD1Rings[i];
struct vnt_td_info *td_info = desc->td_info;
- dev_kfree_skb(td_info->skb);
- kfree(desc->td_info);
+ if (td_info) {
+ dev_kfree_skb(td_info->skb);
+ kfree(desc->td_info);
+ }
}
}
--
1.9.1
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