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usb: ohci: 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 + count * size" in the kzalloc() function.

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

Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Len Baker <len.baker@gmx.com>
Link: https://lore.kernel.org/r/20210911112631.10004-1-len.baker@gmx.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Len Baker 2021-09-11 13:26:31 +02:00 committed by Greg Kroah-Hartman
parent 9c172d4cdf
commit 6943ee7c9d
1 changed files with 1 additions and 2 deletions
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3
drivers/usb/host/ohci-hcd.c
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@ -191,8 +191,7 @@ static int ohci_urb_enqueue (
}
/* allocate the private part of the URB */
urb_priv = kzalloc (sizeof (urb_priv_t) + size * sizeof (struct td *),
mem_flags);
urb_priv = kzalloc(struct_size(urb_priv, td, size), mem_flags);
if (!urb_priv)
return -ENOMEM;
INIT_LIST_HEAD (&urb_priv->pending);