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thunderbolt: Ensure left shift of 512 does not overflow a 32 bit int 

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: 3b1d8d577c ("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>
This commit is contained in:
Colin Ian King 2020-06-30 15:55:58 +01:00 committed by Mika Westerberg
parent dacb12877d
commit 4c767ce48c
1 changed files with 2 additions and 2 deletions
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4
drivers/thunderbolt/usb4.c
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@ -1368,7 +1368,7 @@ 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);
}
@ -1378,7 +1378,7 @@ 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,