[patch] Staging: sep: potential buffer overflow in ioctl

Dan Carpenter
2011-10-29T07:20:20Z

tail_size is determined by several variables that come from the user
so we should verify that it's not too large.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

diff --git a/drivers/staging/sep/sep_driver.c b/drivers/staging/sep/sep_driver.c
index 8ac3fae..e624e28 100644
--- a/drivers/staging/sep/sep_driver.c
+++ b/drivers/staging/sep/sep_driver.c
@@ -2120,6 +2120,8 @@ static int sep_prepare_input_output_dma_table_in_dcb(struct sep_device *sep,
}
}
if (tail_size) {
+ if (tail_size > sizeof(dcb_table_ptr->tail_data))
+ return -EINVAL;
if (is_kva = true) {
memcpy(dcb_table_ptr->tail_data,
(void *)(app_in_address + data_in_size -