Message ID | 20200910032505.10882-9-koba.ko@canonical.com |
---|---|
State | New |
Headers | show |
Series | [1/8,SRU,OEM-5.6] thunderbolt: Add support for separating the flush to SPI and authenticate | expand |
On Thu, Sep 10, 2020 at 11:25 AM Koba Ko <koba.ko@canonical.com> wrote: > > From: Colin Ian King <colin.king@canonical.com> > > BugLink: https://bugs.launchpad.net/bugs/1895073 > > The 32 bit int value 512 is being left shifted and then used in a context > that expects the expression to be a larger unsigned long. There may be > a potential integer overflow, so make 512 a UL before shift to avoid > any such issues. > > Addresses-Coverity: ("Uninintentional integer overflow") > Fixes: 3b1d8d577ca8 ("thunderbolt: Implement USB3 bandwidth negotiation routines") > Signed-off-by: Colin Ian King <colin.king@canonical.com> > Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> > (cherry picked from commit 4c767ce48cf858971545164c4c53d028e6241c07) > Signed-off-by: Koba Ko <koba.ko@canonical.com> > --- > drivers/thunderbolt/usb4.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/thunderbolt/usb4.c b/drivers/thunderbolt/usb4.c > index 5c8b3b95ce12..997a86a68cb2 100644 > --- a/drivers/thunderbolt/usb4.c > +++ b/drivers/thunderbolt/usb4.c > @@ -1349,7 +1349,7 @@ static unsigned int usb3_bw_to_mbps(u32 bw, u8 scale) > { > unsigned long uframes; > > - uframes = bw * 512 << scale; > + uframes = bw * 512UL << scale; > return DIV_ROUND_CLOSEST(uframes * 8000, 1000 * 1000); > } > > @@ -1359,7 +1359,7 @@ static u32 mbps_to_usb3_bw(unsigned int mbps, u8 scale) > > /* 1 uframe is 1/8 ms (125 us) -> 1 / 8000 s */ > uframes = ((unsigned long)mbps * 1000 * 1000) / 8000; > - return DIV_ROUND_UP(uframes, 512 << scale); > + return DIV_ROUND_UP(uframes, 512UL << scale); > } > > static int usb4_usb3_port_read_allocated_bandwidth(struct tb_port *port, > -- > 2.25.1 >
diff --git a/drivers/thunderbolt/usb4.c b/drivers/thunderbolt/usb4.c index 5c8b3b95ce12..997a86a68cb2 100644 --- a/drivers/thunderbolt/usb4.c +++ b/drivers/thunderbolt/usb4.c @@ -1349,7 +1349,7 @@ static unsigned int usb3_bw_to_mbps(u32 bw, u8 scale) { unsigned long uframes; - uframes = bw * 512 << scale; + uframes = bw * 512UL << scale; return DIV_ROUND_CLOSEST(uframes * 8000, 1000 * 1000); } @@ -1359,7 +1359,7 @@ static u32 mbps_to_usb3_bw(unsigned int mbps, u8 scale) /* 1 uframe is 1/8 ms (125 us) -> 1 / 8000 s */ uframes = ((unsigned long)mbps * 1000 * 1000) / 8000; - return DIV_ROUND_UP(uframes, 512 << scale); + return DIV_ROUND_UP(uframes, 512UL << scale); } static int usb4_usb3_port_read_allocated_bandwidth(struct tb_port *port,