mirror of
https://github.com/Divested-Mobile/DivestOS-Build.git
synced 2024-10-01 01:35:54 -04:00
87 lines
2.7 KiB
Diff
87 lines
2.7 KiB
Diff
From a92e71c20f4e6b2aa94b7614fd494833ea76b8b9 Mon Sep 17 00:00:00 2001
|
|
From: Biswajit Paul <biswajitpaul@codeaurora.org>
|
|
Date: Thu, 30 Jun 2016 19:00:50 -0700
|
|
Subject: [PATCH] input: synaptics: allocate heap memory for temp buf
|
|
|
|
rmidev file operations structure include write() and
|
|
read() which accepts data from user space. Temp
|
|
buffers are allocated through variable length arrays
|
|
which can pose security problems. So allocate memory
|
|
on heap instead of stack to avoid this.
|
|
|
|
Bug: 28799389
|
|
CRs-Fixed: 1032459
|
|
Change-Id: I44443f91d435715dd0097ef8e8dfc48e291f93fc
|
|
Signed-off-by: Mohan Pallaka <mpallaka@codeaurora.org>
|
|
Signed-off-by: Biswajit Paul <biswajitpaul@codeaurora.org>
|
|
---
|
|
drivers/input/touchscreen/synaptics_rmi_dev.c | 19 +++++++++++++++----
|
|
1 file changed, 15 insertions(+), 4 deletions(-)
|
|
|
|
diff --git a/drivers/input/touchscreen/synaptics_rmi_dev.c b/drivers/input/touchscreen/synaptics_rmi_dev.c
|
|
index 88595582579e0..e2d7c27eb6832 100644
|
|
--- a/drivers/input/touchscreen/synaptics_rmi_dev.c
|
|
+++ b/drivers/input/touchscreen/synaptics_rmi_dev.c
|
|
@@ -291,7 +291,7 @@ static ssize_t rmidev_read(struct file *filp, char __user *buf,
|
|
size_t count, loff_t *f_pos)
|
|
{
|
|
ssize_t retval;
|
|
- unsigned char tmpbuf[count + 1];
|
|
+ unsigned char *tmpbuf;
|
|
struct rmidev_data *dev_data = filp->private_data;
|
|
|
|
if (IS_ERR(dev_data)) {
|
|
@@ -305,6 +305,10 @@ static ssize_t rmidev_read(struct file *filp, char __user *buf,
|
|
if (count > (REG_ADDR_LIMIT - *f_pos))
|
|
count = REG_ADDR_LIMIT - *f_pos;
|
|
|
|
+ tmpbuf = kzalloc(count + 1, GFP_KERNEL);
|
|
+ if (!tmpbuf)
|
|
+ return -ENOMEM;
|
|
+
|
|
mutex_lock(&(dev_data->file_mutex));
|
|
|
|
retval = rmidev->fn_ptr->read(rmidev->rmi4_data,
|
|
@@ -322,6 +326,7 @@ static ssize_t rmidev_read(struct file *filp, char __user *buf,
|
|
clean_up:
|
|
mutex_unlock(&(dev_data->file_mutex));
|
|
|
|
+ kfree(tmpbuf);
|
|
return retval;
|
|
}
|
|
|
|
@@ -337,7 +342,7 @@ static ssize_t rmidev_write(struct file *filp, const char __user *buf,
|
|
size_t count, loff_t *f_pos)
|
|
{
|
|
ssize_t retval;
|
|
- unsigned char tmpbuf[count + 1];
|
|
+ unsigned char *tmpbuf;
|
|
struct rmidev_data *dev_data = filp->private_data;
|
|
|
|
if (IS_ERR(dev_data)) {
|
|
@@ -351,8 +356,14 @@ static ssize_t rmidev_write(struct file *filp, const char __user *buf,
|
|
if (count > (REG_ADDR_LIMIT - *f_pos))
|
|
count = REG_ADDR_LIMIT - *f_pos;
|
|
|
|
- if (copy_from_user(tmpbuf, buf, count))
|
|
+ tmpbuf = kzalloc(count + 1, GFP_KERNEL);
|
|
+ if (!tmpbuf)
|
|
+ return -ENOMEM;
|
|
+
|
|
+ if (copy_from_user(tmpbuf, buf, count)) {
|
|
+ kfree(tmpbuf);
|
|
return -EFAULT;
|
|
+ }
|
|
|
|
mutex_lock(&(dev_data->file_mutex));
|
|
|
|
@@ -364,7 +375,7 @@ static ssize_t rmidev_write(struct file *filp, const char __user *buf,
|
|
*f_pos += retval;
|
|
|
|
mutex_unlock(&(dev_data->file_mutex));
|
|
-
|
|
+ kfree(tmpbuf);
|
|
return retval;
|
|
}
|
|
|