Messages in this thread Patch in this message |  | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 5.4 20/34] xhci: fix potential array out of bounds with several interrupters | Date | Sun, 2 May 2021 10:04:20 -0400 |
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From: Mathias Nyman <mathias.nyman@linux.intel.com>
[ Upstream commit 286fd02fd54b6acab65809549cf5fb3f2a886696 ]
The Max Interrupters supported by the controller is given in a 10bit wide bitfield, but the driver uses a fixed 128 size array to index these interrupters.
Klockwork reports a possible array out of bounds case which in theory is possible. In practice this hasn't been hit as a common number of Max Interrupters for new controllers is 8, not even close to 128.
This needs to be fixed anyway
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com> Link: https://lore.kernel.org/r/20210406070208.3406266-4-mathias.nyman@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/usb/host/xhci.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 143e4002e561..de05ac9d3ae1 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -228,6 +228,7 @@ static void xhci_zero_64b_regs(struct xhci_hcd *xhci) struct device *dev = xhci_to_hcd(xhci)->self.sysdev; int err, i; u64 val; + u32 intrs; /* * Some Renesas controllers get into a weird state if they are @@ -266,7 +267,10 @@ static void xhci_zero_64b_regs(struct xhci_hcd *xhci) if (upper_32_bits(val)) xhci_write_64(xhci, 0, &xhci->op_regs->cmd_ring); - for (i = 0; i < HCS_MAX_INTRS(xhci->hcs_params1); i++) { + intrs = min_t(u32, HCS_MAX_INTRS(xhci->hcs_params1), + ARRAY_SIZE(xhci->run_regs->ir_set)); + + for (i = 0; i < intrs; i++) { struct xhci_intr_reg __iomem *ir; ir = &xhci->run_regs->ir_set[i]; -- 2.30.2
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