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Subject[PATCH v5 1/2] staging: vt6655: check for memory allocation failures
Date
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. Implement error handling code on device_init_rd*, device_init_td*
and vnt_start for the allocation failures.

Signed-off-by: Ji-Hun Kim <ji_hun.kim@samsung.com>
---
Changes v5:
- Add error handling case for device_alloc_rx_buf() failures.
- Add device_free_rx_buf() which is corresponding free function of
device_allocated_rx_buf(). And change duplicated codes by this function.
- Modify error handling code about freeing allocated value in the loops to
more proper ways.
- Change goto label names following coding-style conventions.

Changes v4:
- Fix potential memory leaks from error handling code from device init
functions in vnt_start().

Changes v3:
- Modify return type of device_init_rd*, device_init_td*. Then add returns
error code at those functions and vnt_start as well.

Changes v2:
- 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, add if statement for freeing to only allocated
values.

drivers/staging/vt6655/device_main.c | 144 ++++++++++++++++++++++++++++-------
1 file changed, 118 insertions(+), 26 deletions(-)

diff --git a/drivers/staging/vt6655/device_main.c b/drivers/staging/vt6655/device_main.c
index fbc4bc6..700c03c 100644
--- a/drivers/staging/vt6655/device_main.c
+++ b/drivers/staging/vt6655/device_main.c
@@ -19,6 +19,7 @@
* device_print_info - print out resource
* device_rx_srv - rx service function
* device_alloc_rx_buf - rx buffer pre-allocated function
+ * device_free_rx_buf - free rx buffer function
* device_free_tx_buf - free tx buffer function
* device_init_rd0_ring- initial rd dma0 ring
* device_init_rd1_ring- initial rd dma1 ring
@@ -124,14 +125,15 @@
static void device_free_info(struct vnt_private *priv);
static void device_print_info(struct vnt_private *priv);

-static void device_init_rd0_ring(struct vnt_private *priv);
-static void device_init_rd1_ring(struct vnt_private *priv);
-static void device_init_td0_ring(struct vnt_private *priv);
-static void device_init_td1_ring(struct vnt_private *priv);
+static int device_init_rd0_ring(struct vnt_private *priv);
+static int device_init_rd1_ring(struct vnt_private *priv);
+static int device_init_td0_ring(struct vnt_private *priv);
+static int device_init_td1_ring(struct vnt_private *priv);

static int device_rx_srv(struct vnt_private *priv, unsigned int idx);
static int device_tx_srv(struct vnt_private *priv, unsigned int idx);
static bool device_alloc_rx_buf(struct vnt_private *, struct vnt_rx_desc *);
+static void device_free_rx_buf(struct vnt_private *priv, struct vnt_rx_desc *rd);
static void device_init_registers(struct vnt_private *priv);
static void device_free_tx_buf(struct vnt_private *, struct vnt_tx_desc *);
static void device_free_td0_ring(struct vnt_private *priv);
@@ -528,20 +530,28 @@ static void device_free_rings(struct vnt_private *priv)
priv->tx0_bufs, priv->tx_bufs_dma0);
}

-static void device_init_rd0_ring(struct vnt_private *priv)
+static int device_init_rd0_ring(struct vnt_private *priv)
{
int i;
dma_addr_t curr = priv->rd0_pool_dma;
struct vnt_rx_desc *desc;
+ int ret;

/* Init the RD0 ring entries */
for (i = 0; i < priv->opts.rx_descs0;
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) {
+ ret = -ENOMEM;
+ goto err_free_desc;
+ }

- if (!device_alloc_rx_buf(priv, desc))
+ if (!device_alloc_rx_buf(priv, desc)) {
dev_err(&priv->pcid->dev, "can not alloc rx bufs\n");
+ ret = -ENOMEM;
+ goto err_free_rd;
+ }

desc->next = &priv->aRD0Ring[(i + 1) % priv->opts.rx_descs0];
desc->next_desc = cpu_to_le32(curr + sizeof(struct vnt_rx_desc));
@@ -550,22 +560,44 @@ 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 0;
+
+err_free_rd:
+ kfree(desc->rd_info);
+
+err_free_desc:
+ while (--i) {
+ desc = &priv->aRD0Ring[i];
+ device_free_rx_buf(priv, desc);
+ kfree(desc->rd_info);
+ }
+
+ return ret;
}

-static void device_init_rd1_ring(struct vnt_private *priv)
+static int device_init_rd1_ring(struct vnt_private *priv)
{
int i;
dma_addr_t curr = priv->rd1_pool_dma;
struct vnt_rx_desc *desc;
+ int ret;

/* Init the RD1 ring entries */
for (i = 0; i < priv->opts.rx_descs1;
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) {
+ ret = -ENOMEM;
+ goto err_free_desc;
+ }

- if (!device_alloc_rx_buf(priv, desc))
+ if (!device_alloc_rx_buf(priv, desc)) {
dev_err(&priv->pcid->dev, "can not alloc rx bufs\n");
+ ret = -ENOMEM;
+ goto err_free_rd;
+ }

desc->next = &priv->aRD1Ring[(i+1) % priv->opts.rx_descs1];
desc->next_desc = cpu_to_le32(curr + sizeof(struct vnt_rx_desc));
@@ -574,6 +606,20 @@ 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 0;
+
+err_free_rd:
+ kfree(desc->rd_info);
+
+err_free_desc:
+ while (--i) {
+ desc = &priv->aRD1Ring[i];
+ device_free_rx_buf(priv, desc);
+ kfree(desc->rd_info);
+ }
+
+ return ret;
}

static void device_free_rd0_ring(struct vnt_private *priv)
@@ -582,13 +628,8 @@ static void device_free_rd0_ring(struct vnt_private *priv)

for (i = 0; i < priv->opts.rx_descs0; i++) {
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);

+ device_free_rx_buf(priv, desc);
kfree(desc->rd_info);
}
}
@@ -599,28 +640,28 @@ static void device_free_rd1_ring(struct vnt_private *priv)

for (i = 0; i < priv->opts.rx_descs1; i++) {
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);

+ device_free_rx_buf(priv, desc);
kfree(desc->rd_info);
}
}

-static void device_init_td0_ring(struct vnt_private *priv)
+static int device_init_td0_ring(struct vnt_private *priv)
{
int i;
dma_addr_t curr;
struct vnt_tx_desc *desc;
+ int ret;

curr = priv->td0_pool_dma;
for (i = 0; i < priv->opts.tx_descs[0];
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) {
+ ret = -ENOMEM;
+ goto err_free_desc;
+ }

desc->td_info->buf = priv->tx0_bufs + i * PKT_BUF_SZ;
desc->td_info->buf_dma = priv->tx_bufs_dma0 + i * PKT_BUF_SZ;
@@ -632,13 +673,24 @@ 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 0;
+
+err_free_desc:
+ while (--i) {
+ desc = &priv->apTD0Rings[i];
+ kfree(desc->td_info);
+ }
+
+ return ret;
}

-static void device_init_td1_ring(struct vnt_private *priv)
+static int device_init_td1_ring(struct vnt_private *priv)
{
int i;
dma_addr_t curr;
struct vnt_tx_desc *desc;
+ int ret;

/* Init the TD ring entries */
curr = priv->td1_pool_dma;
@@ -646,6 +698,10 @@ 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) {
+ ret = -ENOMEM;
+ goto err_free_desc;
+ }

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 +713,16 @@ 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 0;
+
+err_free_desc:
+ while (--i) {
+ desc = &priv->apTD1Rings[i];
+ kfree(desc->td_info);
+ }
+
+ return ret;
}

static void device_free_td0_ring(struct vnt_private *priv)
@@ -745,6 +811,16 @@ static bool device_alloc_rx_buf(struct vnt_private *priv,
return true;
}

+static void device_free_rx_buf(struct vnt_private *priv,
+ struct vnt_rx_desc *rd)
+{
+ struct vnt_rd_info *rd_info = rd->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);
+}
+
static const u8 fallback_rate0[5][5] = {
{RATE_18M, RATE_18M, RATE_12M, RATE_12M, RATE_12M},
{RATE_24M, RATE_24M, RATE_18M, RATE_12M, RATE_12M},
@@ -1165,10 +1241,18 @@ static int vnt_start(struct ieee80211_hw *hw)
}

dev_dbg(&priv->pcid->dev, "call device init rd0 ring\n");
- device_init_rd0_ring(priv);
- device_init_rd1_ring(priv);
- device_init_td0_ring(priv);
- device_init_td1_ring(priv);
+ ret = device_init_rd0_ring(priv);
+ if (ret)
+ return ret;
+ ret = device_init_rd1_ring(priv);
+ if (ret)
+ goto err_free_rd0_ring;
+ ret = device_init_td0_ring(priv);
+ if (ret)
+ goto err_free_rd1_ring;
+ ret = device_init_td1_ring(priv);
+ if (ret)
+ goto err_free_td0_ring;

device_init_registers(priv);

@@ -1178,6 +1262,14 @@ static int vnt_start(struct ieee80211_hw *hw)
ieee80211_wake_queues(hw);

return 0;
+
+err_free_td0_ring:
+ device_free_td0_ring(priv);
+err_free_rd1_ring:
+ device_free_rd1_ring(priv);
+err_free_rd0_ring:
+ device_free_rd0_ring(priv);
+ return ret;
}

static void vnt_stop(struct ieee80211_hw *hw)
--
1.9.1
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