[PATCH AUTOSEL 5.15 33/50] usb: host: xhci: mvebu: Iterate over array indexes instead of using pointer math

Sasha Levin
2023-03-03T23:22:25Z

From: Kees Cook <keescook@chromium.org>

[ Upstream commit 0fbd2cda92cdb00f72080665554a586f88bca821 ]

Walking the dram->cs array was seen as accesses beyond the first array
item by the compiler. Instead, use the array index directly. This allows
for run-time bounds checking under CONFIG_UBSAN_BOUNDS as well. Seen
with GCC 13 with -fstrict-flex-arrays:

In function 'xhci_mvebu_mbus_config',
inlined from 'xhci_mvebu_mbus_init_quirk' at ../drivers/usb/host/xhci-mvebu.c:66:2:
../drivers/usb/host/xhci-mvebu.c:37:28: warning: array subscript 0 is outside array bounds of 'const struct mbus_dram_window[0]' [-Warray-bounds=]
37 | writel(((cs->size - 1) & 0xffff0000) | (cs->mbus_attr << 8) |
| ~~^~~~~~

Cc: Mathias Nyman <mathias.nyman@intel.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20230204183651.never.663-kees@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/usb/host/xhci-mvebu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/host/xhci-mvebu.c b/drivers/usb/host/xhci-mvebu.c
index 8ca1a235d1645..eabccf25796b2 100644
--- a/drivers/usb/host/xhci-mvebu.c
+++ b/drivers/usb/host/xhci-mvebu.c
@@ -33,7 +33,7 @@ static void xhci_mvebu_mbus_config(void __iomem *base,

/* Program each DRAM CS in a seperate window */
for (win = 0; win < dram->num_cs; win++) {
- const struct mbus_dram_window *cs = dram->cs + win;
+ const struct mbus_dram_window *cs = &dram->cs[win];

writel(((cs->size - 1) & 0xffff0000) | (cs->mbus_attr << 8) |
(dram->mbus_dram_target_id << 4) | 1,
--
2.39.2