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Message-ID: <20220120015546.GA75917@embeddedor>
Date: Wed, 19 Jan 2022 19:55:46 -0600
From: "Gustavo A. R. Silva" <gustavoars@...nel.org>
To: Mathias Nyman <mathias.nyman@...el.com>,
Chunfeng Yun <chunfeng.yun@...iatek.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Matthias Brugger <matthias.bgg@...il.com>
Cc: linux-usb@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
"Gustavo A. R. Silva" <gustavoars@...nel.org>,
linux-hardening@...r.kernel.org
Subject: [PATCH][next] usb: xhci-mtk: Use struct_size() helper in
create_sch_ep()
Make use of the struct_size() helper instead of an open-coded version,
in order to avoid any potential type mistakes or integer overflows that,
in the worst scenario, could lead to heap overflows.
Also, address the following sparse warnings:
drivers/usb/host/xhci-mtk-sch.c:265:20: warning: using sizeof on a flexible structure
Link: https://github.com/KSPP/linux/issues/160
Link: https://github.com/KSPP/linux/issues/174
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
drivers/usb/host/xhci-mtk-sch.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/drivers/usb/host/xhci-mtk-sch.c b/drivers/usb/host/xhci-mtk-sch.c
index edbfa82c6565..f3139ce7b0a9 100644
--- a/drivers/usb/host/xhci-mtk-sch.c
+++ b/drivers/usb/host/xhci-mtk-sch.c
@@ -248,7 +248,6 @@ create_sch_ep(struct xhci_hcd_mtk *mtk, struct usb_device *udev,
struct mu3h_sch_bw_info *bw_info;
struct mu3h_sch_tt *tt = NULL;
u32 len_bw_budget_table;
- size_t mem_size;
bw_info = get_bw_info(mtk, udev, ep);
if (!bw_info)
@@ -262,9 +261,9 @@ create_sch_ep(struct xhci_hcd_mtk *mtk, struct usb_device *udev,
else
len_bw_budget_table = 1;
- mem_size = sizeof(struct mu3h_sch_ep_info) +
- len_bw_budget_table * sizeof(u32);
- sch_ep = kzalloc(mem_size, GFP_KERNEL);
+ sch_ep = kzalloc(struct_size(sch_ep, bw_budget_table,
+ len_bw_budget_table),
+ GFP_KERNEL);
if (!sch_ep)
return ERR_PTR(-ENOMEM);
--
2.27.0
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