diff options
| author | jwboyer@redhat.com <jwboyer@redhat.com> | 2012-02-21 00:34:34 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-02-25 01:37:45 +0400 |
| commit | 4898e07174b79013afd2b422ef6c4336ef8e6783 (patch) | |
| tree | 2619e8211fb6880fdca366c755df7a4dc35a9ae1 /drivers/usb | |
| parent | 28c56ea1431421dec51b7b229369e991481453df (diff) | |
| download | linux-4898e07174b79013afd2b422ef6c4336ef8e6783.tar.xz | |
USB: ums_realtek: do not use stack memory for DMA in __do_config_autodelink
__do_config_autodelink passes the data variable to the transport function.
If the calling functions pass a stack variable, this will eventually trigger
a DMA-API debug backtrace for mapping stack memory in the DMA buffer. Fix
this by calling kmemdup for the passed data instead.
Signed-off-by: Josh Boyer <jwboyer@redhat.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/storage/realtek_cr.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/usb/storage/realtek_cr.c b/drivers/usb/storage/realtek_cr.c index b1c2fe8b6dcd..84a4bc0cbee4 100644 --- a/drivers/usb/storage/realtek_cr.c +++ b/drivers/usb/storage/realtek_cr.c @@ -507,9 +507,14 @@ static int __do_config_autodelink(struct us_data *us, u8 *data, u16 len) { int retval; u8 cmnd[12] = {0}; + u8 *buf; US_DEBUGP("%s, addr = 0xfe47, len = %d\n", __FUNCTION__, len); + buf = kmemdup(data, len, GFP_NOIO); + if (!buf) + return USB_STOR_TRANSPORT_ERROR; + cmnd[0] = 0xF0; cmnd[1] = 0x0E; cmnd[2] = 0xfe; @@ -517,7 +522,8 @@ static int __do_config_autodelink(struct us_data *us, u8 *data, u16 len) cmnd[4] = (u8)(len >> 8); cmnd[5] = (u8)len; - retval = rts51x_bulk_transport_special(us, 0, cmnd, 12, data, len, DMA_TO_DEVICE, NULL); + retval = rts51x_bulk_transport_special(us, 0, cmnd, 12, buf, len, DMA_TO_DEVICE, NULL); + kfree(buf); if (retval != USB_STOR_TRANSPORT_GOOD) { return -EIO; } |