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serial: 8250_pci: Prefer struct_size over open coded arithmetic

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As noted in the "Deprecated Interfaces, Language Features, Attributes,
and Conventions" documentation [1], size calculations (especially
multiplication) should not be performed in memory allocator (or similar)
function arguments due to the risk of them overflowing. This could lead
to values wrapping around and a smaller allocation being made than the
caller was expecting. Using those allocations could lead to linear
overflows of heap memory and other misbehaviors.

So, use the struct_size() helper to do the arithmetic instead of the
argument "size + size * count" in the kzalloc() function.

[1] https://www.kernel.org/doc/html/v5.14/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Len Baker <len.baker@gmx.com>
Link: https://lore.kernel.org/r/20210905155728.11147-1-len.baker@gmx.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Len Baker 2021-09-05 17:57:28 +02:00 committed by Greg Kroah-Hartman
parent 0f3b577384
commit 42c457cc9a
1 changed files with 1 additions and 3 deletions
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4
drivers/tty/serial/8250/8250_pci.c
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@ -3981,9 +3981,7 @@ pciserial_init_ports(struct pci_dev *dev, const struct pciserial_board *board)
nr_ports = rc;
}
priv = kzalloc(sizeof(struct serial_private) +
sizeof(unsigned int) * nr_ports,
GFP_KERNEL);
priv = kzalloc(struct_size(priv, line, nr_ports), GFP_KERNEL);
if (!priv) {
priv = ERR_PTR(-ENOMEM);
goto err_deinit;