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USB: ene_usb6250: fix DMA to the stack
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The ene_usb6250 sub-driver in usb-storage does USB I/O to buffers on
the stack, which doesn't work with vmapped stacks.  This patch fixes
the problem by allocating a separate 512-byte buffer at probe time and
using it for all of the offending I/O operations.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Reported-and-tested-by: Andreas Hartmann <andihartmann@01019freenet.de>
CC: <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Alan Stern authored and Greg Kroah-Hartman committed May 17, 2017
1 parent 9b31071 commit 628c289
Showing 1 changed file with 55 additions and 35 deletions.
90 changes: 55 additions & 35 deletions drivers/usb/storage/ene_ub6250.c
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Original file line number Diff line number Diff line change
Expand Up @@ -446,6 +446,10 @@ struct ms_lib_ctrl {
#define SD_BLOCK_LEN 9

struct ene_ub6250_info {

/* I/O bounce buffer */
u8 *bbuf;

/* for 6250 code */
struct SD_STATUS SD_Status;
struct MS_STATUS MS_Status;
Expand Down Expand Up @@ -493,8 +497,11 @@ static int ene_load_bincode(struct us_data *us, unsigned char flag);

static void ene_ub6250_info_destructor(void *extra)
{
struct ene_ub6250_info *info = (struct ene_ub6250_info *) extra;

if (!extra)
return;
kfree(info->bbuf);
}

static int ene_send_scsi_cmd(struct us_data *us, u8 fDir, void *buf, int use_sg)
Expand Down Expand Up @@ -860,8 +867,9 @@ static int ms_read_readpage(struct us_data *us, u32 PhyBlockAddr,
u8 PageNum, u32 *PageBuf, struct ms_lib_type_extdat *ExtraDat)
{
struct bulk_cb_wrap *bcb = (struct bulk_cb_wrap *) us->iobuf;
struct ene_ub6250_info *info = (struct ene_ub6250_info *) us->extra;
u8 *bbuf = info->bbuf;
int result;
u8 ExtBuf[4];
u32 bn = PhyBlockAddr * 0x20 + PageNum;

result = ene_load_bincode(us, MS_RW_PATTERN);
Expand Down Expand Up @@ -901,7 +909,7 @@ static int ms_read_readpage(struct us_data *us, u32 PhyBlockAddr,
bcb->CDB[2] = (unsigned char)(PhyBlockAddr>>16);
bcb->CDB[6] = 0x01;

result = ene_send_scsi_cmd(us, FDIR_READ, &ExtBuf, 0);
result = ene_send_scsi_cmd(us, FDIR_READ, bbuf, 0);
if (result != USB_STOR_XFER_GOOD)
return USB_STOR_TRANSPORT_ERROR;

Expand All @@ -910,9 +918,9 @@ static int ms_read_readpage(struct us_data *us, u32 PhyBlockAddr,
ExtraDat->status0 = 0x10; /* Not yet,fireware support */

ExtraDat->status1 = 0x00; /* Not yet,fireware support */
ExtraDat->ovrflg = ExtBuf[0];
ExtraDat->mngflg = ExtBuf[1];
ExtraDat->logadr = memstick_logaddr(ExtBuf[2], ExtBuf[3]);
ExtraDat->ovrflg = bbuf[0];
ExtraDat->mngflg = bbuf[1];
ExtraDat->logadr = memstick_logaddr(bbuf[2], bbuf[3]);

return USB_STOR_TRANSPORT_GOOD;
}
Expand Down Expand Up @@ -1332,8 +1340,9 @@ static int ms_lib_read_extra(struct us_data *us, u32 PhyBlock,
u8 PageNum, struct ms_lib_type_extdat *ExtraDat)
{
struct bulk_cb_wrap *bcb = (struct bulk_cb_wrap *) us->iobuf;
struct ene_ub6250_info *info = (struct ene_ub6250_info *) us->extra;
u8 *bbuf = info->bbuf;
int result;
u8 ExtBuf[4];

memset(bcb, 0, sizeof(struct bulk_cb_wrap));
bcb->Signature = cpu_to_le32(US_BULK_CB_SIGN);
Expand All @@ -1347,17 +1356,17 @@ static int ms_lib_read_extra(struct us_data *us, u32 PhyBlock,
bcb->CDB[2] = (unsigned char)(PhyBlock>>16);
bcb->CDB[6] = 0x01;

result = ene_send_scsi_cmd(us, FDIR_READ, &ExtBuf, 0);
result = ene_send_scsi_cmd(us, FDIR_READ, bbuf, 0);
if (result != USB_STOR_XFER_GOOD)
return USB_STOR_TRANSPORT_ERROR;

ExtraDat->reserved = 0;
ExtraDat->intr = 0x80; /* Not yet, waiting for fireware support */
ExtraDat->status0 = 0x10; /* Not yet, waiting for fireware support */
ExtraDat->status1 = 0x00; /* Not yet, waiting for fireware support */
ExtraDat->ovrflg = ExtBuf[0];
ExtraDat->mngflg = ExtBuf[1];
ExtraDat->logadr = memstick_logaddr(ExtBuf[2], ExtBuf[3]);
ExtraDat->ovrflg = bbuf[0];
ExtraDat->mngflg = bbuf[1];
ExtraDat->logadr = memstick_logaddr(bbuf[2], bbuf[3]);

return USB_STOR_TRANSPORT_GOOD;
}
Expand Down Expand Up @@ -1556,9 +1565,9 @@ static int ms_lib_scan_logicalblocknumber(struct us_data *us, u16 btBlk1st)
u16 PhyBlock, newblk, i;
u16 LogStart, LogEnde;
struct ms_lib_type_extdat extdat;
u8 buf[0x200];
u32 count = 0, index = 0;
struct ene_ub6250_info *info = (struct ene_ub6250_info *) us->extra;
u8 *bbuf = info->bbuf;

for (PhyBlock = 0; PhyBlock < info->MS_Lib.NumberOfPhyBlock;) {
ms_lib_phy_to_log_range(PhyBlock, &LogStart, &LogEnde);
Expand All @@ -1572,14 +1581,16 @@ static int ms_lib_scan_logicalblocknumber(struct us_data *us, u16 btBlk1st)
}

if (count == PhyBlock) {
ms_lib_read_extrablock(us, PhyBlock, 0, 0x80, &buf);
ms_lib_read_extrablock(us, PhyBlock, 0, 0x80,
bbuf);
count += 0x80;
}
index = (PhyBlock % 0x80) * 4;

extdat.ovrflg = buf[index];
extdat.mngflg = buf[index+1];
extdat.logadr = memstick_logaddr(buf[index+2], buf[index+3]);
extdat.ovrflg = bbuf[index];
extdat.mngflg = bbuf[index+1];
extdat.logadr = memstick_logaddr(bbuf[index+2],
bbuf[index+3]);

if ((extdat.ovrflg & MS_REG_OVR_BKST) != MS_REG_OVR_BKST_OK) {
ms_lib_setacquired_errorblock(us, PhyBlock);
Expand Down Expand Up @@ -2062,9 +2073,9 @@ static int ene_ms_init(struct us_data *us)
{
struct bulk_cb_wrap *bcb = (struct bulk_cb_wrap *) us->iobuf;
int result;
u8 buf[0x200];
u16 MSP_BlockSize, MSP_UserAreaBlocks;
struct ene_ub6250_info *info = (struct ene_ub6250_info *) us->extra;
u8 *bbuf = info->bbuf;

printk(KERN_INFO "transport --- ENE_MSInit\n");

Expand All @@ -2083,13 +2094,13 @@ static int ene_ms_init(struct us_data *us)
bcb->CDB[0] = 0xF1;
bcb->CDB[1] = 0x01;

result = ene_send_scsi_cmd(us, FDIR_READ, &buf, 0);
result = ene_send_scsi_cmd(us, FDIR_READ, bbuf, 0);
if (result != USB_STOR_XFER_GOOD) {
printk(KERN_ERR "Execution MS Init Code Fail !!\n");
return USB_STOR_TRANSPORT_ERROR;
}
/* the same part to test ENE */
info->MS_Status = *(struct MS_STATUS *)&buf[0];
info->MS_Status = *(struct MS_STATUS *) bbuf;

if (info->MS_Status.Insert && info->MS_Status.Ready) {
printk(KERN_INFO "Insert = %x\n", info->MS_Status.Insert);
Expand All @@ -2098,15 +2109,15 @@ static int ene_ms_init(struct us_data *us)
printk(KERN_INFO "IsMSPHG = %x\n", info->MS_Status.IsMSPHG);
printk(KERN_INFO "WtP= %x\n", info->MS_Status.WtP);
if (info->MS_Status.IsMSPro) {
MSP_BlockSize = (buf[6] << 8) | buf[7];
MSP_UserAreaBlocks = (buf[10] << 8) | buf[11];
MSP_BlockSize = (bbuf[6] << 8) | bbuf[7];
MSP_UserAreaBlocks = (bbuf[10] << 8) | bbuf[11];
info->MSP_TotalBlock = MSP_BlockSize * MSP_UserAreaBlocks;
} else {
ms_card_init(us); /* Card is MS (to ms.c)*/
}
usb_stor_dbg(us, "MS Init Code OK !!\n");
} else {
usb_stor_dbg(us, "MS Card Not Ready --- %x\n", buf[0]);
usb_stor_dbg(us, "MS Card Not Ready --- %x\n", bbuf[0]);
return USB_STOR_TRANSPORT_ERROR;
}

Expand All @@ -2116,9 +2127,9 @@ static int ene_ms_init(struct us_data *us)
static int ene_sd_init(struct us_data *us)
{
int result;
u8 buf[0x200];
struct bulk_cb_wrap *bcb = (struct bulk_cb_wrap *) us->iobuf;
struct ene_ub6250_info *info = (struct ene_ub6250_info *) us->extra;
u8 *bbuf = info->bbuf;

usb_stor_dbg(us, "transport --- ENE_SDInit\n");
/* SD Init Part-1 */
Expand Down Expand Up @@ -2152,25 +2163,25 @@ static int ene_sd_init(struct us_data *us)
bcb->Flags = US_BULK_FLAG_IN;
bcb->CDB[0] = 0xF1;

result = ene_send_scsi_cmd(us, FDIR_READ, &buf, 0);
result = ene_send_scsi_cmd(us, FDIR_READ, bbuf, 0);
if (result != USB_STOR_XFER_GOOD) {
usb_stor_dbg(us, "Execution SD Init Code Fail !!\n");
return USB_STOR_TRANSPORT_ERROR;
}

info->SD_Status = *(struct SD_STATUS *)&buf[0];
info->SD_Status = *(struct SD_STATUS *) bbuf;
if (info->SD_Status.Insert && info->SD_Status.Ready) {
struct SD_STATUS *s = &info->SD_Status;

ene_get_card_status(us, (unsigned char *)&buf);
ene_get_card_status(us, bbuf);
usb_stor_dbg(us, "Insert = %x\n", s->Insert);
usb_stor_dbg(us, "Ready = %x\n", s->Ready);
usb_stor_dbg(us, "IsMMC = %x\n", s->IsMMC);
usb_stor_dbg(us, "HiCapacity = %x\n", s->HiCapacity);
usb_stor_dbg(us, "HiSpeed = %x\n", s->HiSpeed);
usb_stor_dbg(us, "WtP = %x\n", s->WtP);
} else {
usb_stor_dbg(us, "SD Card Not Ready --- %x\n", buf[0]);
usb_stor_dbg(us, "SD Card Not Ready --- %x\n", bbuf[0]);
return USB_STOR_TRANSPORT_ERROR;
}
return USB_STOR_TRANSPORT_GOOD;
Expand All @@ -2180,13 +2191,15 @@ static int ene_sd_init(struct us_data *us)
static int ene_init(struct us_data *us)
{
int result;
u8 misc_reg03 = 0;
u8 misc_reg03;
struct ene_ub6250_info *info = (struct ene_ub6250_info *)(us->extra);
u8 *bbuf = info->bbuf;

result = ene_get_card_type(us, REG_CARD_STATUS, &misc_reg03);
result = ene_get_card_type(us, REG_CARD_STATUS, bbuf);
if (result != USB_STOR_XFER_GOOD)
return USB_STOR_TRANSPORT_ERROR;

misc_reg03 = bbuf[0];
if (misc_reg03 & 0x01) {
if (!info->SD_Status.Ready) {
result = ene_sd_init(us);
Expand Down Expand Up @@ -2303,8 +2316,9 @@ static int ene_ub6250_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
int result;
u8 misc_reg03 = 0;
u8 misc_reg03;
struct us_data *us;
struct ene_ub6250_info *info;

result = usb_stor_probe1(&us, intf, id,
(id - ene_ub6250_usb_ids) + ene_ub6250_unusual_dev_list,
Expand All @@ -2313,11 +2327,16 @@ static int ene_ub6250_probe(struct usb_interface *intf,
return result;

/* FIXME: where should the code alloc extra buf ? */
if (!us->extra) {
us->extra = kzalloc(sizeof(struct ene_ub6250_info), GFP_KERNEL);
if (!us->extra)
return -ENOMEM;
us->extra_destructor = ene_ub6250_info_destructor;
us->extra = kzalloc(sizeof(struct ene_ub6250_info), GFP_KERNEL);
if (!us->extra)
return -ENOMEM;
us->extra_destructor = ene_ub6250_info_destructor;

info = (struct ene_ub6250_info *)(us->extra);
info->bbuf = kmalloc(512, GFP_KERNEL);
if (!info->bbuf) {
kfree(us->extra);
return -ENOMEM;
}

us->transport_name = "ene_ub6250";
Expand All @@ -2329,12 +2348,13 @@ static int ene_ub6250_probe(struct usb_interface *intf,
return result;

/* probe card type */
result = ene_get_card_type(us, REG_CARD_STATUS, &misc_reg03);
result = ene_get_card_type(us, REG_CARD_STATUS, info->bbuf);
if (result != USB_STOR_XFER_GOOD) {
usb_stor_disconnect(intf);
return USB_STOR_TRANSPORT_ERROR;
}

misc_reg03 = info->bbuf[0];
if (!(misc_reg03 & 0x01)) {
pr_info("ums_eneub6250: This driver only supports SD/MS cards. "
"It does not support SM cards.\n");
Expand Down

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