[PATCH 5.19 095/192] wifi: wilc1000: fix DMA on stack objects

Greg Kroah-Hartman
2022-09-13T14:18:10Z

From: Ajay.Kathat@microchip.com <Ajay.Kathat@microchip.com>

[ Upstream commit 40b717bfcefab28a0656b8caa5e43d5449e5a671 ]

Sometimes 'wilc_sdio_cmd53' is called with addresses pointing to an
object on the stack. Use dynamically allocated memory for cmd53 instead
of stack address which is not DMA'able.

Fixes: 5625f965d764 ("wilc1000: move wilc driver out of staging")
Reported-by: Michael Walle <mwalle@kernel.org>
Suggested-by: Michael Walle <mwalle@kernel.org>
Signed-off-by: Ajay Singh <ajay.kathat@microchip.com>
Reviewed-by: Michael Walle <mwalle@kernel.org>
Tested-by: Michael Walle <mwalle@kernel.org>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220809075749.62752-1-ajay.kathat@microchip.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
.../net/wireless/microchip/wilc1000/netdev.h | 1 +
.../net/wireless/microchip/wilc1000/sdio.c | 39 ++++++++++++++++---
.../net/wireless/microchip/wilc1000/wlan.c | 15 ++++++-
3 files changed, 47 insertions(+), 8 deletions(-)

diff --git a/drivers/net/wireless/microchip/wilc1000/netdev.h b/drivers/net/wireless/microchip/wilc1000/netdev.h
index a067274c20144..bf001e9def6aa 100644
--- a/drivers/net/wireless/microchip/wilc1000/netdev.h
+++ b/drivers/net/wireless/microchip/wilc1000/netdev.h
@@ -254,6 +254,7 @@ struct wilc {
u8 *rx_buffer;
u32 rx_buffer_offset;
u8 *tx_buffer;
+ u32 *vmm_table;

struct txq_handle txq[NQUEUES];
int txq_entries;
diff --git a/drivers/net/wireless/microchip/wilc1000/sdio.c b/drivers/net/wireless/microchip/wilc1000/sdio.c
index 7962c11cfe848..56f924a31bc66 100644
--- a/drivers/net/wireless/microchip/wilc1000/sdio.c
+++ b/drivers/net/wireless/microchip/wilc1000/sdio.c
@@ -27,6 +27,7 @@ struct wilc_sdio {
bool irq_gpio;
u32 block_size;
int has_thrpt_enh3;
+ u8 *cmd53_buf;
};

struct sdio_cmd52 {
@@ -46,6 +47,7 @@ struct sdio_cmd53 {
u32 count: 9;
u8 *buffer;
u32 block_size;
+ bool use_global_buf;
};

static const struct wilc_hif_func wilc_hif_sdio;
@@ -90,6 +92,8 @@ static int wilc_sdio_cmd53(struct wilc *wilc, struct sdio_cmd53 *cmd)
{
struct sdio_func *func = container_of(wilc->dev, struct sdio_func, dev);
int size, ret;
+ struct wilc_sdio *sdio_priv = wilc->bus_data;
+ u8 *buf = cmd->buffer;

sdio_claim_host(func);

@@ -100,12 +104,23 @@ static int wilc_sdio_cmd53(struct wilc *wilc, struct sdio_cmd53 *cmd)
else
size = cmd->count;

+ if (cmd->use_global_buf) {
+ if (size > sizeof(u32))
+ return -EINVAL;
+
+ buf = sdio_priv->cmd53_buf;
+ }
+
if (cmd->read_write) { /* write */
- ret = sdio_memcpy_toio(func, cmd->address,
- (void *)cmd->buffer, size);
+ if (cmd->use_global_buf)
+ memcpy(buf, cmd->buffer, size);
+
+ ret = sdio_memcpy_toio(func, cmd->address, buf, size);
} else { /* read */
- ret = sdio_memcpy_fromio(func, (void *)cmd->buffer,
- cmd->address, size);
+ ret = sdio_memcpy_fromio(func, buf, cmd->address, size);
+
+ if (cmd->use_global_buf)
+ memcpy(cmd->buffer, buf, size);
}

sdio_release_host(func);
@@ -127,6 +142,12 @@ static int wilc_sdio_probe(struct sdio_func *func,
if (!sdio_priv)
return -ENOMEM;

+ sdio_priv->cmd53_buf = kzalloc(sizeof(u32), GFP_KERNEL);
+ if (!sdio_priv->cmd53_buf) {
+ ret = -ENOMEM;
+ goto free;
+ }
+
ret = wilc_cfg80211_init(&wilc, &func->dev, WILC_HIF_SDIO,
&wilc_hif_sdio);
if (ret)
@@ -160,6 +181,7 @@ static int wilc_sdio_probe(struct sdio_func *func,
irq_dispose_mapping(wilc->dev_irq_num);
wilc_netdev_cleanup(wilc);
free:
+ kfree(sdio_priv->cmd53_buf);
kfree(sdio_priv);
return ret;
}
@@ -171,6 +193,7 @@ static void wilc_sdio_remove(struct sdio_func *func)

clk_disable_unprepare(wilc->rtc_clk);
wilc_netdev_cleanup(wilc);
+ kfree(sdio_priv->cmd53_buf);
kfree(sdio_priv);
}

@@ -367,8 +390,9 @@ static int wilc_sdio_write_reg(struct wilc *wilc, u32 addr, u32 data)
cmd.address = WILC_SDIO_FBR_DATA_REG;
cmd.block_mode = 0;
cmd.increment = 1;
- cmd.count = 4;
+ cmd.count = sizeof(u32);
cmd.buffer = (u8 *)&data;
+ cmd.use_global_buf = true;
cmd.block_size = sdio_priv->block_size;
ret = wilc_sdio_cmd53(wilc, &cmd);
if (ret)
@@ -406,6 +430,7 @@ static int wilc_sdio_write(struct wilc *wilc, u32 addr, u8 *buf, u32 size)
nblk = size / block_size;
nleft = size % block_size;

+ cmd.use_global_buf = false;
if (nblk > 0) {
cmd.block_mode = 1;
cmd.increment = 1;
@@ -484,8 +509,9 @@ static int wilc_sdio_read_reg(struct wilc *wilc, u32 addr, u32 *data)
cmd.address = WILC_SDIO_FBR_DATA_REG;
cmd.block_mode = 0;
cmd.increment = 1;
- cmd.count = 4;
+ cmd.count = sizeof(u32);
cmd.buffer = (u8 *)data;
+ cmd.use_global_buf = true;

cmd.block_size = sdio_priv->block_size;
ret = wilc_sdio_cmd53(wilc, &cmd);
@@ -527,6 +553,7 @@ static int wilc_sdio_read(struct wilc *wilc, u32 addr, u8 *buf, u32 size)
nblk = size / block_size;
nleft = size % block_size;

+ cmd.use_global_buf = false;
if (nblk > 0) {
cmd.block_mode = 1;
cmd.increment = 1;
diff --git a/drivers/net/wireless/microchip/wilc1000/wlan.c b/drivers/net/wireless/microchip/wilc1000/wlan.c
index 48441f0389ca1..0c8a571486d25 100644
--- a/drivers/net/wireless/microchip/wilc1000/wlan.c
+++ b/drivers/net/wireless/microchip/wilc1000/wlan.c
@@ -714,7 +714,7 @@ int wilc_wlan_handle_txq(struct wilc *wilc, u32 *txq_count)
int ret = 0;
int counter;
int timeout;
- u32 vmm_table[WILC_VMM_TBL_SIZE];
+ u32 *vmm_table = wilc->vmm_table;
u8 ac_pkt_num_to_chip[NQUEUES] = {0, 0, 0, 0};
const struct wilc_hif_func *func;
int srcu_idx;
@@ -1251,6 +1251,8 @@ void wilc_wlan_cleanup(struct net_device *dev)
while ((rqe = wilc_wlan_rxq_remove(wilc)))
kfree(rqe);

+ kfree(wilc->vmm_table);
+ wilc->vmm_table = NULL;
kfree(wilc->rx_buffer);
wilc->rx_buffer = NULL;
kfree(wilc->tx_buffer);
@@ -1485,6 +1487,14 @@ int wilc_wlan_init(struct net_device *dev)
goto fail;
}

+ if (!wilc->vmm_table)
+ wilc->vmm_table = kzalloc(WILC_VMM_TBL_SIZE, GFP_KERNEL);
+
+ if (!wilc->vmm_table) {
+ ret = -ENOBUFS;
+ goto fail;
+ }
+
if (!wilc->tx_buffer)
wilc->tx_buffer = kmalloc(WILC_TX_BUFF_SIZE, GFP_KERNEL);

@@ -1509,7 +1519,8 @@ int wilc_wlan_init(struct net_device *dev)
return 0;

fail:
-
+ kfree(wilc->vmm_table);
+ wilc->vmm_table = NULL;
kfree(wilc->rx_buffer);
wilc->rx_buffer = NULL;
kfree(wilc->tx_buffer);
--
2.35.1