net: ena: Fix potential sign extension issue

[ Upstream commit 713a85195aad25d8a26786a37b674e3e5ec09e3c ]

Small unsigned types are promoted to larger signed types in
the case of multiplication, the result of which may overflow.
In case the result of such a multiplication has its MSB
turned on, it will be sign extended with '1's.
This changes the multiplication result.

Code example of the phenomenon:
-------------------------------
u16 x, y;
size_t z1, z2;

x = y = 0xffff;
printk("x=%x y=%x\n",x,y);

z1 = x*y;
z2 = (size_t)x*y;

printk("z1=%lx z2=%lx\n", z1, z2);

Output:
-------
x=ffff y=ffff
z1=fffffffffffe0001 z2=fffe0001

The expected result of ffff*ffff is fffe0001, and without the
explicit casting to avoid the unwanted sign extension we got
fffffffffffe0001.

This commit adds an explicit casting to avoid the sign extension
issue.

Fixes: 689b2bdaaa14 ("net: ena: add functions for handling Low Latency Queues in ena_com")
Signed-off-by: Arthur Kiyanovski <akiyano@amazon.com>
Signed-off-by: David Arinzon <darinzon@amazon.com>
Reviewed-by: Shannon Nelson <shannon.nelson@amd.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/amazon/ena/ena_com.c b/drivers/net/ethernet/amazon/ena/ena_com.c
index 29700fee42e9d97657acb29489004649ae2091b4..46a796576f6b60277c062a68e73ea0765bdb6706 100644 (file)
--- a/drivers/net/ethernet/amazon/ena/ena_com.c
+++ b/drivers/net/ethernet/amazon/ena/ena_com.c
@@ -374,7 +374,7 @@ static int ena_com_init_io_sq(struct ena_com_dev *ena_dev,
                        ENA_COM_BOUNCE_BUFFER_CNTRL_CNT;
                io_sq->bounce_buf_ctrl.next_to_use = 0;
 
-               size = io_sq->bounce_buf_ctrl.buffer_size *
+               size = (size_t)io_sq->bounce_buf_ctrl.buffer_size *
                        io_sq->bounce_buf_ctrl.buffers_num;
 
                dev_node = dev_to_node(ena_dev->dmadev);