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net: dsa: Remove VLA usage

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We avoid 2 VLAs by using a pre-allocated field in dsa_switch. We also
try to avoid dynamic allocation whenever possible (when using fewer than
bits-per-long ports, which is the common case).

Link: http://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com
Link: http://lkml.kernel.org/r/20180505185145.GB32630@lunn.ch
Signed-off-by: Salvatore Mesoraca <s.mesoraca16@gmail.com>
[kees: tweak commit subject and message slightly]
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Salvatore Mesoraca 2018-07-16 21:10:34 -07:00 • committed by David S. Miller
parent 14260e9170
commit 0015b80abc
3 changed files with 27 additions and 12 deletions
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14
net/dsa/dsa2.c
View file

@ -775,6 +775,20 @@ struct dsa_switch *dsa_switch_alloc(struct device *dev, size_t n)
if (!ds)
return NULL;
/* We avoid allocating memory outside dsa_switch
* if it is not needed.
*/
if (n <= sizeof(ds->_bitmap) * 8) {
ds->bitmap = &ds->_bitmap;
} else {
ds->bitmap = devm_kcalloc(dev,
BITS_TO_LONGS(n),
sizeof(unsigned long),
GFP_KERNEL);
if (unlikely(!ds->bitmap))
return NULL;
}
ds->dev = dev;
ds->num_ports = n;