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Date:   Sun,  5 Sep 2021 17:57:28 +0200
From:   Len Baker <>
To:     Greg Kroah-Hartman <>,
        Jiri Slaby <>
Cc:     Len Baker <>, Kees Cook <>,
        "Maciej W. Rozycki" <>,
        Andy Shevchenko <>,
        Mario Kleiner <>,
        Geert Uytterhoeven <>,
        Randy Wright <>,
        Christian Gmeiner <>,
        Tobias Diedrich <>,
        YueHaibing <>,,,
Subject: [PATCH] serial: 8250_pci: Prefer struct_size over open coded arithmetic

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.


Signed-off-by: Len Baker <>
 drivers/tty/serial/8250/8250_pci.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c
index a808c283883e..b97ade35d4a3 100644
--- a/drivers/tty/serial/8250/8250_pci.c
+++ b/drivers/tty/serial/8250/8250_pci.c
@@ -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;

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