mirror of
https://github.com/Divested-Mobile/DivestOS-Build.git
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62 lines
2.3 KiB
Diff
62 lines
2.3 KiB
Diff
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From fd11eb5c433743c87bebe699604adfd7e7e805cf Mon Sep 17 00:00:00 2001
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From: Min Chong <mchong@google.com>
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Date: Thu, 13 Oct 2016 09:47:01 -0700
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Subject: [PATCH] input: synaptics_dsx: add bounds checks for firmware id
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A series of characters between '0' and '9' with a length more than
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MAX_FIRMWARE_ID_LEN causes a heap buffer overflow. This is
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mitigated by performing a bounds check.
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Bug: 31911920
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Signed-off-by: Mark Salyzyn <salyzyn@google.com>
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Signed-off-by: Min Chong <mchong@google.com>
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Change-Id: Iaefe92df2610153f2d3e2caa58322ae82cb5b7c2
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---
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.../touchscreen/synaptics_dsx25/synaptics_dsx_fw_update.c | 13 +++++++++----
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1 file changed, 9 insertions(+), 4 deletions(-)
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diff --git a/drivers/input/touchscreen/synaptics_dsx25/synaptics_dsx_fw_update.c b/drivers/input/touchscreen/synaptics_dsx25/synaptics_dsx_fw_update.c
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index 908693bd26a43..ff82a4f3a55e8 100755
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--- a/drivers/input/touchscreen/synaptics_dsx25/synaptics_dsx_fw_update.c
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+++ b/drivers/input/touchscreen/synaptics_dsx25/synaptics_dsx_fw_update.c
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@@ -16,6 +16,7 @@
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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+#include <linux/ctype.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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@@ -2154,15 +2155,15 @@ static int fwu_read_f34_blocks(unsigned short block_cnt, unsigned char cmd)
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static int fwu_get_image_firmware_id(unsigned int *fw_id)
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{
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int retval;
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- unsigned char index = 0;
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- char *strptr;
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char *firmware_id;
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struct synaptics_rmi4_data *rmi4_data = fwu->rmi4_data;
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if (fwu->img.contains_firmware_id) {
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*fw_id = fwu->img.firmware_id;
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} else {
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- strptr = strnstr(fwu->image_name, "PR", MAX_IMAGE_NAME_LEN);
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+ size_t index, max_index;
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+ unsigned char *strptr = strnstr(fwu->image_name, "PR", MAX_IMAGE_NAME_LEN);
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+
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if (!strptr) {
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dev_err(rmi4_data->pdev->dev.parent,
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"%s: No valid PR number (PRxxxxxxx) "
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@@ -2179,7 +2180,11 @@ static int fwu_get_image_firmware_id(unsigned int *fw_id)
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__func__);
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return -ENOMEM;
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}
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- while (strptr[index] >= '0' && strptr[index] <= '9') {
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+
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+ max_index = min((ptrdiff_t)(MAX_FIRMWARE_ID_LEN - 1),
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+ &fwu->image_name[MAX_IMAGE_NAME_LEN] - strptr);
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+ index = 0;
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+ while (index < max_index && isdigit(strptr[index])) {
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firmware_id[index] = strptr[index];
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index++;
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}
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