When the spidev module tries to access the user space memory passed in via
an IOCTL the compat_ptr function should be called to ensure
compatibility between kernel space and user space.
Signed-off-by: Dan Sneddon <dsneddon@xxxxxxxxxxxxxx>
---
drivers/spi/spidev.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/spi/spidev.c b/drivers/spi/spidev.c
index e3bc23b..3a45158 100644
--- a/drivers/spi/spidev.c
+++ b/drivers/spi/spidev.c
@@ -252,14 +252,16 @@ static int spidev_message(struct spidev_data *spidev,
if (u_tmp->rx_buf) {
k_tmp->rx_buf = buf;
if (!access_ok(VERIFY_WRITE, (u8 __user *)
- (uintptr_t) u_tmp->rx_buf,
+ (uintptr_t)compat_ptr( +
u_tmp->rx_buf),
u_tmp->len))
goto done;
}
if (u_tmp->tx_buf) {
k_tmp->tx_buf = buf;
if (copy_from_user(buf, (const u8 __user *)
- (uintptr_t) u_tmp->tx_buf,
+ (uintptr_t)compat_ptr( +
u_tmp->tx_buf),
u_tmp->len))
goto done;
}
@@ -294,8 +296,8 @@ static int spidev_message(struct spidev_data *spidev,
for (n = n_xfers, u_tmp = u_xfers; n; n--, u_tmp++) {
if (u_tmp->rx_buf) {
if (__copy_to_user((u8 __user *)
- (uintptr_t) u_tmp->rx_buf, buf, -
u_tmp->len)) {
+
(uintptr_t)compat_ptr(u_tmp->rx_buf),
+ buf, u_tmp->len)) {
status = -EFAULT;
goto done;
}
--
1.8.4
---
sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
hosted by The Linux Foundation
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