DivestOS/Patches/Linux_CVEs/CVE-2014-9787/0.patch

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From 528400ae4cba715f6c9ff4a2657dafd913f30b8b Mon Sep 17 00:00:00 2001
From: Hariprasad Dhalinarasimha <hnamgund@codeaurora.org>
Date: Thu, 3 Oct 2013 16:43:39 -0700
Subject: qseecom: Validate the incoming length from user space
Check if there is no integer overflow before using req_len and
resp_len (received from user space). If an overflow is detected
then exit the operation.
Change-Id: I0459a6992bb3b280db42be63a275c55fa6105b1c
Signed-off-by: Hariprasad Dhalinarasimha <hnamgund@codeaurora.org>
---
drivers/misc/qseecom.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/misc/qseecom.c b/drivers/misc/qseecom.c
index 58703cf..1452908 100644
--- a/drivers/misc/qseecom.c
+++ b/drivers/misc/qseecom.c
@@ -961,6 +961,11 @@ static int __qseecom_send_cmd(struct qseecom_dev_handle *data,
return -EINVAL;
}
+ if (req->cmd_req_len > UINT_MAX - req->resp_len) {
+ pr_err("Integer overflow detected in req_len & rsp_len, exiting now\n");
+ return -EINVAL;
+ }
+
reqd_len_sb_in = req->cmd_req_len + req->resp_len;
if (reqd_len_sb_in > data->client.sb_length) {
pr_debug("Not enough memory to fit cmd_buf and "
@@ -980,7 +985,7 @@ static int __qseecom_send_cmd(struct qseecom_dev_handle *data,
msm_ion_do_cache_op(qseecom.ion_clnt, data->client.ihandle,
data->client.sb_virt,
- (req->cmd_req_len + req->resp_len),
+ reqd_len_sb_in,
ION_IOC_CLEAN_INV_CACHES);
ret = scm_call(SCM_SVC_TZSCHEDULER, 1, (const void *) &send_data_req,
--
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