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mdio_bus: NULL dereference on allocation error 

If bus = kzalloc() fails then we end up dereferencing bus when we do
"bus->irq[i] = PHY_POLL;".  The code is a little simpler if we reverse
the NULL check and return directly on failure.

Fixes: e7f4dc3536 ('mdio: Move allocation of interrupts into core')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dan Carpenter 2016-01-12 12:34:36 +03:00 committed by David S. Miller
parent 9d367eddf3
commit db9107b497
1 changed files with 6 additions and 5 deletions
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11
drivers/net/phy/mdio_bus.c
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@ -102,11 +102,12 @@ struct mii_bus *mdiobus_alloc_size(size_t size)
alloc_size = sizeof(*bus);
bus = kzalloc(alloc_size, GFP_KERNEL);
if (bus) {
bus->state = MDIOBUS_ALLOCATED;
if (size)
bus->priv = (void *)bus + aligned_size;
}
if (!bus)
return NULL;
bus->state = MDIOBUS_ALLOCATED;
if (size)
bus->priv = (void *)bus + aligned_size;
/* Initialise the interrupts to polling */
for (i = 0; i < PHY_MAX_ADDR; i++)