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https://github.com/Divested-Mobile/DivestOS-Build.git
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34 lines
1.2 KiB
Diff
34 lines
1.2 KiB
Diff
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From 94f4b81da69ec72486476adb59d7c818bd4ffbd0 Mon Sep 17 00:00:00 2001
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From: chengengjia <chengjia4574@gmail.com>
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Date: Wed, 10 Aug 2016 17:34:43 +0800
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Subject: [PATCH] input: synaptics: Add checks of user input data
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Add checks of the user input count to avoid possible heap overflow
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Bug: 30799828
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Change-Id: I896492b18c4ace6565fb9edd5cbf51f363ce157b
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Signed-off-by: chengengjia <chengjia4574@gmail.com>
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Signed-off-by: Andrew Chant <achant@google.com>
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---
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drivers/input/touchscreen/synaptics_fw_update.c | 7 +++++++
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1 file changed, 7 insertions(+)
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diff --git a/drivers/input/touchscreen/synaptics_fw_update.c b/drivers/input/touchscreen/synaptics_fw_update.c
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index 8e457ccaa5245..170a202590ad4 100644
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--- a/drivers/input/touchscreen/synaptics_fw_update.c
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+++ b/drivers/input/touchscreen/synaptics_fw_update.c
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@@ -1736,6 +1736,13 @@ static ssize_t fwu_sysfs_store_image(struct file *data_file,
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return -EAGAIN;
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}
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+ if (count > fwu->image_size - fwu->data_pos) {
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+ dev_err(&fwu->rmi4_data->i2c_client->dev,
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+ "%s: Not enough space in buffer\n",
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+ __func__);
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+ return -EINVAL;
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+ }
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+
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memcpy((void *)(&fwu->ext_data_source[fwu->data_pos]),
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(const void *)buf,
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count);
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