mirror of
https://github.com/Divested-Mobile/DivestOS-Build.git
synced 2024-10-01 01:35:54 -04:00
119 lines
2.7 KiB
Diff
119 lines
2.7 KiB
Diff
From e1fb1600fc222337989e3084d68df929882deae5 Mon Sep 17 00:00:00 2001
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From: Andrew Chant <achant@google.com>
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Date: Tue, 17 Jan 2017 07:37:52 -0800
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Subject: [PATCH] input: synaptics: put offset checks under mutex.
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Place file offset validity checks under mutex.
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BUG: 33555878
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BUG: 33002026
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Change-Id: I1945cfc8af7d1a310ae0d7bbb85002d4c448f30b
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Signed-off-by: Andrew Chant <achant@google.com>
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---
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drivers/input/touchscreen/synaptics_rmi_dev.c | 52 ++++++++++++++++++---------
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1 file changed, 36 insertions(+), 16 deletions(-)
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diff --git a/drivers/input/touchscreen/synaptics_rmi_dev.c b/drivers/input/touchscreen/synaptics_rmi_dev.c
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index e2d7c27eb6832..e7c19d00c0544 100644
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--- a/drivers/input/touchscreen/synaptics_rmi_dev.c
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+++ b/drivers/input/touchscreen/synaptics_rmi_dev.c
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@@ -299,18 +299,26 @@ static ssize_t rmidev_read(struct file *filp, char __user *buf,
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return -EBADF;
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}
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- if (count == 0)
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- return 0;
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+ mutex_lock(&(dev_data->file_mutex));
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if (count > (REG_ADDR_LIMIT - *f_pos))
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count = REG_ADDR_LIMIT - *f_pos;
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- tmpbuf = kzalloc(count + 1, GFP_KERNEL);
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- if (!tmpbuf)
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- return -ENOMEM;
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+ if (count == 0) {
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+ retval = 0;
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+ goto unlock;
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+ }
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- mutex_lock(&(dev_data->file_mutex));
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+ if (*f_pos > REG_ADDR_LIMIT) {
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+ retval = -EFAULT;
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+ goto unlock;
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+ }
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+ tmpbuf = kzalloc(count + 1, GFP_KERNEL);
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+ if (!tmpbuf) {
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+ retval = -ENOMEM;
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+ goto unlock;
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+ }
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retval = rmidev->fn_ptr->read(rmidev->rmi4_data,
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*f_pos,
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tmpbuf,
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@@ -324,9 +332,10 @@ static ssize_t rmidev_read(struct file *filp, char __user *buf,
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*f_pos += retval;
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clean_up:
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+ kfree(tmpbuf);
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+unlock:
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mutex_unlock(&(dev_data->file_mutex));
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- kfree(tmpbuf);
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return retval;
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}
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@@ -350,23 +359,32 @@ static ssize_t rmidev_write(struct file *filp, const char __user *buf,
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return -EBADF;
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}
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- if (count == 0)
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- return 0;
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+ mutex_lock(&(dev_data->file_mutex));
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+
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+ if (*f_pos > REG_ADDR_LIMIT) {
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+ retval = -EFAULT;
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+ goto unlock;
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+ }
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if (count > (REG_ADDR_LIMIT - *f_pos))
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count = REG_ADDR_LIMIT - *f_pos;
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+ if (count == 0) {
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+ retval = 0;
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+ goto unlock;
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+ }
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+
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tmpbuf = kzalloc(count + 1, GFP_KERNEL);
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- if (!tmpbuf)
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- return -ENOMEM;
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+ if (!tmpbuf) {
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+ retval = -ENOMEM;
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+ goto unlock;
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+ }
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if (copy_from_user(tmpbuf, buf, count)) {
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- kfree(tmpbuf);
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- return -EFAULT;
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+ retval = -EFAULT;
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+ goto clean_up;
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}
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- mutex_lock(&(dev_data->file_mutex));
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-
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retval = rmidev->fn_ptr->write(rmidev->rmi4_data,
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*f_pos,
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tmpbuf,
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@@ -374,8 +392,10 @@ static ssize_t rmidev_write(struct file *filp, const char __user *buf,
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if (retval >= 0)
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*f_pos += retval;
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- mutex_unlock(&(dev_data->file_mutex));
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+clean_up:
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kfree(tmpbuf);
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+unlock:
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+ mutex_unlock(&(dev_data->file_mutex));
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return retval;
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}
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