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>
diff --git a/drivers/misc/qseecom.c b/drivers/misc/qseecom.c
index ac67c9d..d1fc8e4 100644
--- a/drivers/misc/qseecom.c
+++ b/drivers/misc/qseecom.c
@@ -1014,6 +1014,11 @@
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 "