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ums_realtek: do not use stack memory for DMA

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This patch changes rts51x_read_mem, rts51x_write_mem, and rts51x_read_status to
allocate temporary buffers with kmalloc. This way stack addresses are not used
for DMA when these functions call rts51x_bulk_transport.

Signed-off-by: Adam Cozzette <acozzette@cs.hmc.edu>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Adam Cozzette 2011-08-24 12:22:37 -06:00 committed by Greg Kroah-Hartman
parent 5de9ec4dc1
commit 065e60964e
1 changed files with 30 additions and 5 deletions
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35
drivers/usb/storage/realtek_cr.c
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@ -320,6 +320,11 @@ static int rts51x_read_mem(struct us_data *us, u16 addr, u8 *data, u16 len)
{
int retval;
u8 cmnd[12] = { 0 };
u8 *buf;
buf = kmalloc(len, GFP_NOIO);
if (buf == NULL)
return USB_STOR_TRANSPORT_ERROR;
US_DEBUGP("%s, addr = 0x%x, len = %d\n", __func__, addr, len);
@ -331,10 +336,14 @@ static int rts51x_read_mem(struct us_data *us, u16 addr, u8 *data, u16 len)
cmnd[5] = (u8) len;
retval = rts51x_bulk_transport(us, 0, cmnd, 12,
data, len, DMA_FROM_DEVICE, NULL);
if (retval != USB_STOR_TRANSPORT_GOOD)
buf, len, DMA_FROM_DEVICE, NULL);
if (retval != USB_STOR_TRANSPORT_GOOD) {
kfree(buf);
return -EIO;
}
memcpy(data, buf, len);
kfree(buf);
return 0;
}
@ -342,6 +351,12 @@ static int rts51x_write_mem(struct us_data *us, u16 addr, u8 *data, u16 len)
{
int retval;
u8 cmnd[12] = { 0 };
u8 *buf;
buf = kmalloc(len, GFP_NOIO);
if (buf == NULL)
return USB_STOR_TRANSPORT_ERROR;
memcpy(buf, data, len);
US_DEBUGP("%s, addr = 0x%x, len = %d\n", __func__, addr, len);
@ -353,7 +368,8 @@ static int rts51x_write_mem(struct us_data *us, u16 addr, u8 *data, u16 len)
cmnd[5] = (u8) len;
retval = rts51x_bulk_transport(us, 0, cmnd, 12,
data, len, DMA_TO_DEVICE, NULL);
buf, len, DMA_TO_DEVICE, NULL);
kfree(buf);
if (retval != USB_STOR_TRANSPORT_GOOD)
return -EIO;
@ -365,6 +381,11 @@ static int rts51x_read_status(struct us_data *us,
{
int retval;
u8 cmnd[12] = { 0 };
u8 *buf;
buf = kmalloc(len, GFP_NOIO);
if (buf == NULL)
return USB_STOR_TRANSPORT_ERROR;
US_DEBUGP("%s, lun = %d\n", __func__, lun);
@ -372,10 +393,14 @@ static int rts51x_read_status(struct us_data *us,
cmnd[1] = 0x09;
retval = rts51x_bulk_transport(us, lun, cmnd, 12,
status, len, DMA_FROM_DEVICE, actlen);
if (retval != USB_STOR_TRANSPORT_GOOD)
buf, len, DMA_FROM_DEVICE, actlen);
if (retval != USB_STOR_TRANSPORT_GOOD) {
kfree(buf);
return -EIO;
}
memcpy(status, buf, len);
kfree(buf);
return 0;
}