mirror of
https://github.com/Divested-Mobile/DivestOS-Build.git
synced 2024-12-12 01:14:22 -05:00
119 lines
2.7 KiB
Diff
119 lines
2.7 KiB
Diff
From e1fb1600fc222337989e3084d68df929882deae5 Mon Sep 17 00:00:00 2001
|
|
From: Andrew Chant <achant@google.com>
|
|
Date: Tue, 17 Jan 2017 07:37:52 -0800
|
|
Subject: [PATCH] input: synaptics: put offset checks under mutex.
|
|
|
|
Place file offset validity checks under mutex.
|
|
|
|
BUG: 33555878
|
|
BUG: 33002026
|
|
|
|
Change-Id: I1945cfc8af7d1a310ae0d7bbb85002d4c448f30b
|
|
Signed-off-by: Andrew Chant <achant@google.com>
|
|
---
|
|
drivers/input/touchscreen/synaptics_rmi_dev.c | 52 ++++++++++++++++++---------
|
|
1 file changed, 36 insertions(+), 16 deletions(-)
|
|
|
|
diff --git a/drivers/input/touchscreen/synaptics_rmi_dev.c b/drivers/input/touchscreen/synaptics_rmi_dev.c
|
|
index e2d7c27eb6832..e7c19d00c0544 100644
|
|
--- a/drivers/input/touchscreen/synaptics_rmi_dev.c
|
|
+++ b/drivers/input/touchscreen/synaptics_rmi_dev.c
|
|
@@ -299,18 +299,26 @@ static ssize_t rmidev_read(struct file *filp, char __user *buf,
|
|
return -EBADF;
|
|
}
|
|
|
|
- if (count == 0)
|
|
- return 0;
|
|
+ mutex_lock(&(dev_data->file_mutex));
|
|
|
|
if (count > (REG_ADDR_LIMIT - *f_pos))
|
|
count = REG_ADDR_LIMIT - *f_pos;
|
|
|
|
- tmpbuf = kzalloc(count + 1, GFP_KERNEL);
|
|
- if (!tmpbuf)
|
|
- return -ENOMEM;
|
|
+ if (count == 0) {
|
|
+ retval = 0;
|
|
+ goto unlock;
|
|
+ }
|
|
|
|
- mutex_lock(&(dev_data->file_mutex));
|
|
+ if (*f_pos > REG_ADDR_LIMIT) {
|
|
+ retval = -EFAULT;
|
|
+ goto unlock;
|
|
+ }
|
|
|
|
+ tmpbuf = kzalloc(count + 1, GFP_KERNEL);
|
|
+ if (!tmpbuf) {
|
|
+ retval = -ENOMEM;
|
|
+ goto unlock;
|
|
+ }
|
|
retval = rmidev->fn_ptr->read(rmidev->rmi4_data,
|
|
*f_pos,
|
|
tmpbuf,
|
|
@@ -324,9 +332,10 @@ static ssize_t rmidev_read(struct file *filp, char __user *buf,
|
|
*f_pos += retval;
|
|
|
|
clean_up:
|
|
+ kfree(tmpbuf);
|
|
+unlock:
|
|
mutex_unlock(&(dev_data->file_mutex));
|
|
|
|
- kfree(tmpbuf);
|
|
return retval;
|
|
}
|
|
|
|
@@ -350,23 +359,32 @@ static ssize_t rmidev_write(struct file *filp, const char __user *buf,
|
|
return -EBADF;
|
|
}
|
|
|
|
- if (count == 0)
|
|
- return 0;
|
|
+ mutex_lock(&(dev_data->file_mutex));
|
|
+
|
|
+ if (*f_pos > REG_ADDR_LIMIT) {
|
|
+ retval = -EFAULT;
|
|
+ goto unlock;
|
|
+ }
|
|
|
|
if (count > (REG_ADDR_LIMIT - *f_pos))
|
|
count = REG_ADDR_LIMIT - *f_pos;
|
|
|
|
+ if (count == 0) {
|
|
+ retval = 0;
|
|
+ goto unlock;
|
|
+ }
|
|
+
|
|
tmpbuf = kzalloc(count + 1, GFP_KERNEL);
|
|
- if (!tmpbuf)
|
|
- return -ENOMEM;
|
|
+ if (!tmpbuf) {
|
|
+ retval = -ENOMEM;
|
|
+ goto unlock;
|
|
+ }
|
|
|
|
if (copy_from_user(tmpbuf, buf, count)) {
|
|
- kfree(tmpbuf);
|
|
- return -EFAULT;
|
|
+ retval = -EFAULT;
|
|
+ goto clean_up;
|
|
}
|
|
|
|
- mutex_lock(&(dev_data->file_mutex));
|
|
-
|
|
retval = rmidev->fn_ptr->write(rmidev->rmi4_data,
|
|
*f_pos,
|
|
tmpbuf,
|
|
@@ -374,8 +392,10 @@ static ssize_t rmidev_write(struct file *filp, const char __user *buf,
|
|
if (retval >= 0)
|
|
*f_pos += retval;
|
|
|
|
- mutex_unlock(&(dev_data->file_mutex));
|
|
+clean_up:
|
|
kfree(tmpbuf);
|
|
+unlock:
|
|
+ mutex_unlock(&(dev_data->file_mutex));
|
|
return retval;
|
|
}
|
|
|