DivestOS/Patches/Linux_CVEs/CVE-2017-0524/ANY/1.patch
2017-10-29 22:14:37 -04:00

86 lines
2.3 KiB
Diff

From 0ab30d91fb178c5967753343029581983a4e9b67 Mon Sep 17 00:00:00 2001
From: Andrew Chant <achant@google.com>
Date: Fri, 13 Jan 2017 13:33:57 -0800
Subject: [PATCH] input: synaptics_dsx: protect tmpbuf allocation.
Protect tmpbuf from concurrent access by mutex.
BUG: 33555878
BUG: 33002026
Change-Id: Ia986a34647d5825946594ea17a5cd6fa0abb115f
Signed-off-by: Andrew Chant <achant@google.com>
---
.../synaptics_dsx25/synaptics_dsx_rmi_dev.c | 33 +++++++++++++++-------
1 file changed, 23 insertions(+), 10 deletions(-)
diff --git a/drivers/input/touchscreen/synaptics_dsx25/synaptics_dsx_rmi_dev.c b/drivers/input/touchscreen/synaptics_dsx25/synaptics_dsx_rmi_dev.c
index 87abf86cdc6b4..018c621c0cfeb 100644
--- a/drivers/input/touchscreen/synaptics_dsx25/synaptics_dsx_rmi_dev.c
+++ b/drivers/input/touchscreen/synaptics_dsx25/synaptics_dsx_rmi_dev.c
@@ -483,16 +483,21 @@ 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 (*f_pos > REG_ADDR_LIMIT) {
+ retval = -EFAULT;
+ goto clean_up;
+ }
if (count > (REG_ADDR_LIMIT - *f_pos))
count = REG_ADDR_LIMIT - *f_pos;
+ if (count == 0) {
+ retval = 0;
+ goto clean_up;
+ }
rmidev_allocate_buffer(count);
- mutex_lock(&(dev_data->file_mutex));
-
retval = synaptics_rmi4_reg_read(rmidev->rmi4_data,
*f_pos,
rmidev->tmpbuf,
@@ -530,18 +535,25 @@ 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;
+ }
rmidev_allocate_buffer(count);
- if (copy_from_user(rmidev->tmpbuf, buf, count))
- return -EFAULT;
-
- mutex_lock(&(dev_data->file_mutex));
+ if (copy_from_user(rmidev->tmpbuf, buf, count)) {
+ retval = -EFAULT;
+ goto unlock;
+ }
retval = synaptics_rmi4_reg_write(rmidev->rmi4_data,
*f_pos,
@@ -550,6 +562,7 @@ static ssize_t rmidev_write(struct file *filp, const char __user *buf,
if (retval >= 0)
*f_pos += retval;
+unlock:
mutex_unlock(&(dev_data->file_mutex));
return retval;