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Date: Mon, 6 Jun 2022 22:37:00 +0300
From: Pavel Skripkin <paskripkin@...il.com>
To: gregkh@...uxfoundation.org, Larry.Finger@...inger.net,
phil@...lpotter.co.uk, straube.linux@...il.com,
dan.carpenter@...cle.com
Cc: linux-kernel@...r.kernel.org, linux-staging@...ts.linux.dev,
Pavel Skripkin <paskripkin@...il.com>
Subject: [PATCH v3 2/4] staging: r8188eu: add error handling of rtw_read16
rtw_read16() reads data from device via USB API which may fail. In case
of any failure previous code returned stack data to callers, which is
wrong.
Fix it by changing rtw_read16() prototype and prevent caller from
touching random stack data
Signed-off-by: Pavel Skripkin <paskripkin@...il.com>
---
.../staging/r8188eu/hal/rtl8188e_hal_init.c | 29 +++++++++++++++----
drivers/staging/r8188eu/hal/rtl8188e_phycfg.c | 8 +++--
drivers/staging/r8188eu/hal/usb_halinit.c | 27 ++++++++++++++---
drivers/staging/r8188eu/hal/usb_ops_linux.c | 13 ++++++---
drivers/staging/r8188eu/include/rtw_io.h | 2 +-
drivers/staging/r8188eu/os_dep/ioctl_linux.c | 9 ++++--
drivers/staging/r8188eu/os_dep/os_intfs.c | 6 +++-
7 files changed, 73 insertions(+), 21 deletions(-)
diff --git a/drivers/staging/r8188eu/hal/rtl8188e_hal_init.c b/drivers/staging/r8188eu/hal/rtl8188e_hal_init.c
index e67ecbd1ba79..8215ed8b506d 100644
--- a/drivers/staging/r8188eu/hal/rtl8188e_hal_init.c
+++ b/drivers/staging/r8188eu/hal/rtl8188e_hal_init.c
@@ -200,7 +200,8 @@ efuse_phymap_to_logical(u8 *phymap, u16 _offset, u16 _size_byte, u8 *pbuf)
kfree(eFuseWord);
}
-static void efuse_read_phymap_from_txpktbuf(
+/* FIXME: add error handling in callers */
+static int efuse_read_phymap_from_txpktbuf(
struct adapter *adapter,
int bcnhead, /* beacon head, where FW store len(2-byte) and efuse physical map. */
u8 *content, /* buffer to store efuse physical map */
@@ -219,7 +220,7 @@ static void efuse_read_phymap_from_txpktbuf(
if (bcnhead < 0) { /* if not valid */
res = rtw_read8(adapter, REG_TDECTRL + 1, ®);
if (res)
- return;
+ return res;
bcnhead = reg;
}
@@ -249,11 +250,15 @@ static void efuse_read_phymap_from_txpktbuf(
hi32 = cpu_to_le32(rtw_read32(adapter, REG_PKTBUF_DBG_DATA_H));
if (i == 0) {
+ u16 reg;
+
/* Although lenc is only used in a debug statement,
* do not remove it as the rtw_read16() call consumes
* 2 bytes from the EEPROM source.
*/
- rtw_read16(adapter, REG_PKTBUF_DBG_DATA_L);
+ res = rtw_read16(adapter, REG_PKTBUF_DBG_DATA_L, ®);
+ if (res)
+ return res;
len = le32_to_cpu(lo32) & 0x0000ffff;
@@ -280,6 +285,8 @@ static void efuse_read_phymap_from_txpktbuf(
}
rtw_write8(adapter, REG_PKT_BUFF_ACCESS_CTRL, DISABLE_TRXPKT_BUF_ACCESS);
*size = count;
+
+ return 0;
}
static s32 iol_read_efuse(struct adapter *padapter, u8 txpktbuf_bndy, u16 offset, u16 size_byte, u8 *logical_map)
@@ -355,25 +362,35 @@ int rtl8188e_IOL_exec_cmds_sync(struct adapter *adapter, struct xmit_frame *xmit
void rtl8188e_EfusePowerSwitch(struct adapter *pAdapter, u8 PwrState)
{
u16 tmpV16;
+ int res;
if (PwrState) {
rtw_write8(pAdapter, REG_EFUSE_ACCESS, EFUSE_ACCESS_ON);
/* 1.2V Power: From VDDON with Power Cut(0x0000h[15]), defualt valid */
- tmpV16 = rtw_read16(pAdapter, REG_SYS_ISO_CTRL);
+ res = rtw_read16(pAdapter, REG_SYS_ISO_CTRL, &tmpV16);
+ if (res)
+ return;
+
if (!(tmpV16 & PWC_EV12V)) {
tmpV16 |= PWC_EV12V;
rtw_write16(pAdapter, REG_SYS_ISO_CTRL, tmpV16);
}
/* Reset: 0x0000h[28], default valid */
- tmpV16 = rtw_read16(pAdapter, REG_SYS_FUNC_EN);
+ res = rtw_read16(pAdapter, REG_SYS_FUNC_EN, &tmpV16);
+ if (res)
+ return;
+
if (!(tmpV16 & FEN_ELDR)) {
tmpV16 |= FEN_ELDR;
rtw_write16(pAdapter, REG_SYS_FUNC_EN, tmpV16);
}
/* Clock: Gated(0x0008h[5]) 8M(0x0008h[1]) clock from ANA, default valid */
- tmpV16 = rtw_read16(pAdapter, REG_SYS_CLKR);
+ res = rtw_read16(pAdapter, REG_SYS_CLKR, &tmpV16);
+ if (res)
+ return;
+
if ((!(tmpV16 & LOADER_CLK_EN)) || (!(tmpV16 & ANA8M))) {
tmpV16 |= (LOADER_CLK_EN | ANA8M);
rtw_write16(pAdapter, REG_SYS_CLKR, tmpV16);
diff --git a/drivers/staging/r8188eu/hal/rtl8188e_phycfg.c b/drivers/staging/r8188eu/hal/rtl8188e_phycfg.c
index 985339a974fc..298c3d9bc7be 100644
--- a/drivers/staging/r8188eu/hal/rtl8188e_phycfg.c
+++ b/drivers/staging/r8188eu/hal/rtl8188e_phycfg.c
@@ -484,13 +484,17 @@ PHY_BBConfig8188E(
{
int rtStatus = _SUCCESS;
struct hal_data_8188e *pHalData = &Adapter->haldata;
- u32 RegVal;
+ u16 RegVal;
u8 CrystalCap;
+ int res;
phy_InitBBRFRegisterDefinition(Adapter);
/* Enable BB and RF */
- RegVal = rtw_read16(Adapter, REG_SYS_FUNC_EN);
+ res = rtw_read16(Adapter, REG_SYS_FUNC_EN, &RegVal);
+ if (res)
+ return _FAIL;
+
rtw_write16(Adapter, REG_SYS_FUNC_EN, (u16)(RegVal | BIT(13) | BIT(0) | BIT(1)));
/* 20090923 Joseph: Advised by Steven and Jenyu. Power sequence before init RF. */
diff --git a/drivers/staging/r8188eu/hal/usb_halinit.c b/drivers/staging/r8188eu/hal/usb_halinit.c
index 01422d548748..e7b51b427e8f 100644
--- a/drivers/staging/r8188eu/hal/usb_halinit.c
+++ b/drivers/staging/r8188eu/hal/usb_halinit.c
@@ -52,6 +52,8 @@ void rtl8188eu_interface_configure(struct adapter *adapt)
u32 rtl8188eu_InitPowerOn(struct adapter *adapt)
{
u16 value16;
+ int res;
+
/* HW Power on sequence */
struct hal_data_8188e *haldata = &adapt->haldata;
if (haldata->bMacPwrCtrlOn)
@@ -65,7 +67,10 @@ u32 rtl8188eu_InitPowerOn(struct adapter *adapt)
rtw_write16(adapt, REG_CR, 0x00); /* suggseted by zhouzhou, by page, 20111230 */
/* Enable MAC DMA/WMAC/SCHEDULE/SEC block */
- value16 = rtw_read16(adapt, REG_CR);
+ res = rtw_read16(adapt, REG_CR, &value16);
+ if (res)
+ return _FAIL;
+
value16 |= (HCI_TXDMA_EN | HCI_RXDMA_EN | TXDMA_EN | RXDMA_EN
| PROTOCOL_EN | SCHEDULE_EN | ENSEC | CALTMR_EN);
/* for SDIO - Set CR bit10 to enable 32k calibration. Suggested by SD1 Gimmy. Added by tynli. 2011.08.31. */
@@ -166,7 +171,14 @@ static void _InitNormalChipRegPriority(struct adapter *Adapter, u16 beQ,
u16 bkQ, u16 viQ, u16 voQ, u16 mgtQ,
u16 hiQ)
{
- u16 value16 = (rtw_read16(Adapter, REG_TRXDMA_CTRL) & 0x7);
+ u16 value16;
+ int res;
+
+ res = rtw_read16(Adapter, REG_TRXDMA_CTRL, &value16);
+ if (res)
+ return;
+
+ value16 &= 0x7;
value16 |= _TXDMA_BEQ_MAP(beQ) | _TXDMA_BKQ_MAP(bkQ) |
_TXDMA_VIQ_MAP(viQ) | _TXDMA_VOQ_MAP(voQ) |
@@ -640,7 +652,10 @@ u32 rtl8188eu_hal_init(struct adapter *Adapter)
/* Hw bug which Hw initials RxFF boundary size to a value which is larger than the real Rx buffer size in 88E. */
/* */
/* Enable MACTXEN/MACRXEN block */
- value16 = rtw_read16(Adapter, REG_CR);
+ res = rtw_read16(Adapter, REG_CR, &value16);
+ if (res)
+ return _FAIL;
+
value16 |= (MACTXEN | MACRXEN);
rtw_write8(Adapter, REG_CR, value16);
@@ -713,7 +728,11 @@ u32 rtl8188eu_hal_init(struct adapter *Adapter)
rtw_write16(Adapter, REG_TX_RPT_TIME, 0x3DF0);
/* enable tx DMA to drop the redundate data of packet */
- rtw_write16(Adapter, REG_TXDMA_OFFSET_CHK, (rtw_read16(Adapter, REG_TXDMA_OFFSET_CHK) | DROP_DATA_EN));
+ res = rtw_read16(Adapter, REG_TXDMA_OFFSET_CHK, &value16);
+ if (res)
+ return _FAIL;
+
+ rtw_write16(Adapter, REG_TXDMA_OFFSET_CHK, (value16 | DROP_DATA_EN));
/* 2010/08/26 MH Merge from 8192CE. */
if (pwrctrlpriv->rf_pwrstate == rf_on) {
diff --git a/drivers/staging/r8188eu/hal/usb_ops_linux.c b/drivers/staging/r8188eu/hal/usb_ops_linux.c
index f399a7fd8b97..7d62f1f3d26e 100644
--- a/drivers/staging/r8188eu/hal/usb_ops_linux.c
+++ b/drivers/staging/r8188eu/hal/usb_ops_linux.c
@@ -103,16 +103,21 @@ int __must_check rtw_read8(struct adapter *adapter, u32 addr, u8 *data)
return usb_read(intf, value, data, 1);
}
-u16 rtw_read16(struct adapter *adapter, u32 addr)
+int __must_check rtw_read16(struct adapter *adapter, u32 addr, u16 *data)
{
struct io_priv *io_priv = &adapter->iopriv;
struct intf_hdl *intf = &io_priv->intf;
u16 value = addr & 0xffff;
- __le16 data;
+ __le16 le_data;
+ int res;
- usb_read(intf, value, &data, 2);
+ res = usb_read(intf, value, &le_data, 2);
+ if (res)
+ return res;
- return le16_to_cpu(data);
+ *data = le16_to_cpu(le_data);
+
+ return 0;
}
u32 rtw_read32(struct adapter *adapter, u32 addr)
diff --git a/drivers/staging/r8188eu/include/rtw_io.h b/drivers/staging/r8188eu/include/rtw_io.h
index 1198d3850a6d..ce3369e33d66 100644
--- a/drivers/staging/r8188eu/include/rtw_io.h
+++ b/drivers/staging/r8188eu/include/rtw_io.h
@@ -221,7 +221,7 @@ void _rtw_attrib_read(struct adapter *adapter, u32 addr, u32 cnt, u8 *pmem);
void _rtw_attrib_write(struct adapter *adapter, u32 addr, u32 cnt, u8 *pmem);
int __must_check rtw_read8(struct adapter *adapter, u32 addr, u8 *data);
-u16 rtw_read16(struct adapter *adapter, u32 addr);
+int __must_check rtw_read16(struct adapter *adapter, u32 addr, u16 *data);
u32 rtw_read32(struct adapter *adapter, u32 addr);
void _rtw_read_mem(struct adapter *adapter, u32 addr, u32 cnt, u8 *pmem);
u32 rtw_read_port(struct adapter *adapter, u8 *pmem);
diff --git a/drivers/staging/r8188eu/os_dep/ioctl_linux.c b/drivers/staging/r8188eu/os_dep/ioctl_linux.c
index 168f4ec99a03..30aa2a2c0ade 100644
--- a/drivers/staging/r8188eu/os_dep/ioctl_linux.c
+++ b/drivers/staging/r8188eu/os_dep/ioctl_linux.c
@@ -3349,6 +3349,7 @@ static int rtw_dbg_port(struct net_device *dev,
/* FIXME: is this read necessary? */
res = rtw_read8(padapter, reg, &val8);
+ (void)res;
}
break;
@@ -3357,8 +3358,8 @@ static int rtw_dbg_port(struct net_device *dev,
u16 reg = arg;
u16 start_value = 200;
u32 write_num = extra_arg;
-
- int i;
+ u16 val16;
+ int i, res;
struct xmit_frame *xmit_frame;
xmit_frame = rtw_IOL_accquire_xmit_frame(padapter);
@@ -3372,7 +3373,9 @@ static int rtw_dbg_port(struct net_device *dev,
if (rtl8188e_IOL_exec_cmds_sync(padapter, xmit_frame, 5000, 0) != _SUCCESS)
ret = -EPERM;
- rtw_read16(padapter, reg);
+ /* FIXME: is this read necessary? */
+ res = rtw_read16(padapter, reg, &val16);
+ (void)res;
}
break;
case 0x08: /* continuous write dword test */
diff --git a/drivers/staging/r8188eu/os_dep/os_intfs.c b/drivers/staging/r8188eu/os_dep/os_intfs.c
index 891c85b088ca..d9325ef6ac28 100644
--- a/drivers/staging/r8188eu/os_dep/os_intfs.c
+++ b/drivers/staging/r8188eu/os_dep/os_intfs.c
@@ -740,12 +740,16 @@ static void rtw_fifo_cleanup(struct adapter *adapter)
{
struct pwrctrl_priv *pwrpriv = &adapter->pwrctrlpriv;
u8 trycnt = 100;
+ int res;
/* pause tx */
rtw_write8(adapter, REG_TXPAUSE, 0xff);
/* keep sn */
- adapter->xmitpriv.nqos_ssn = rtw_read16(adapter, REG_NQOS_SEQ);
+ /* FIXME: return an error to caller */
+ res = rtw_read16(adapter, REG_NQOS_SEQ, &adapter->xmitpriv.nqos_ssn);
+ if (res)
+ return;
if (!pwrpriv->bkeepfwalive) {
/* RX DMA stop */
--
2.36.1
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