msm: msm_bus: limit max chars read by sscanf
Current bus_floor_vote_store_api does not limit/check
the size of the string in input, allowing stack overflow.
Specify the max number of characters read allowable to
the size of destination buffer.
CRs-Fixed: 1050455
Change-Id: Ia9227480be6ea4f3ade71f5675f95a3efd9fcf99
Signed-off-by: David Dai <daidavid1@codeaurora.org>
diff --git a/drivers/soc/qcom/msm_bus/msm_bus_dbg_voter.c b/drivers/soc/qcom/msm_bus/msm_bus_dbg_voter.c
index 3f8b52c..6c69bec 100644
--- a/drivers/soc/qcom/msm_bus/msm_bus_dbg_voter.c
+++ b/drivers/soc/qcom/msm_bus/msm_bus_dbg_voter.c
@@ -1,4 +1,4 @@
-/* Copyright (c) 2014-2016, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2014-2017, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
@@ -133,7 +133,7 @@
return 0;
}
- if (sscanf(buf, "%s %llu", name, &vote_khz) != 2) {
+ if (sscanf(buf, "%9s %llu", name, &vote_khz) != 2) {
pr_err("%s:return error", __func__);
return -EINVAL;
}