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44 lines
1.5 KiB
Diff
44 lines
1.5 KiB
Diff
From 528400ae4cba715f6c9ff4a2657dafd913f30b8b Mon Sep 17 00:00:00 2001
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From: Hariprasad Dhalinarasimha <hnamgund@codeaurora.org>
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Date: Thu, 3 Oct 2013 16:43:39 -0700
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Subject: qseecom: Validate the incoming length from user space
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Check if there is no integer overflow before using req_len and
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resp_len (received from user space). If an overflow is detected
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then exit the operation.
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Change-Id: I0459a6992bb3b280db42be63a275c55fa6105b1c
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Signed-off-by: Hariprasad Dhalinarasimha <hnamgund@codeaurora.org>
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---
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drivers/misc/qseecom.c | 7 ++++++-
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1 file changed, 6 insertions(+), 1 deletion(-)
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diff --git a/drivers/misc/qseecom.c b/drivers/misc/qseecom.c
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index 58703cf..1452908 100644
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--- a/drivers/misc/qseecom.c
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+++ b/drivers/misc/qseecom.c
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@@ -961,6 +961,11 @@ static int __qseecom_send_cmd(struct qseecom_dev_handle *data,
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return -EINVAL;
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}
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+ if (req->cmd_req_len > UINT_MAX - req->resp_len) {
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+ pr_err("Integer overflow detected in req_len & rsp_len, exiting now\n");
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+ return -EINVAL;
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+ }
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+
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reqd_len_sb_in = req->cmd_req_len + req->resp_len;
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if (reqd_len_sb_in > data->client.sb_length) {
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pr_debug("Not enough memory to fit cmd_buf and "
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@@ -980,7 +985,7 @@ static int __qseecom_send_cmd(struct qseecom_dev_handle *data,
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msm_ion_do_cache_op(qseecom.ion_clnt, data->client.ihandle,
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data->client.sb_virt,
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- (req->cmd_req_len + req->resp_len),
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+ reqd_len_sb_in,
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ION_IOC_CLEAN_INV_CACHES);
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ret = scm_call(SCM_SVC_TZSCHEDULER, 1, (const void *) &send_data_req,
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--
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cgit v1.1
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