From: Pavel Skripkin <paskripkin@xxxxxxxxx> [ Upstream commit fed9e604eeb6150847d9757f6b056c12912d468b ] 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@xxxxxxxxx> Link: https://lore.kernel.org/r/06b45afda048d0aeddeed983c2318680fe6265f5.1654629778.git.paskripkin@xxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- .../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 19a60d47f7c0..7ec363089ae0 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 */ -- 2.35.1
