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net/core: Fix potential memory leak in dev_set_alias()

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Do not leak memory by updating pointer with potentially NULL realloc return value.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexey Khoroshilov 2012-08-08 00:33:25 +00:00 committed by David S. Miller
parent 47dffc7547
commit 7364e445f6
1 changed files with 5 additions and 2 deletions
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7
net/core/dev.c
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@ -1055,6 +1055,8 @@ int dev_change_name(struct net_device *dev, const char *newname)
*/
int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
{
char *new_ifalias;
ASSERT_RTNL();
if (len >= IFALIASZ)
@ -1068,9 +1070,10 @@ int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
return 0;
}
dev->ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
if (!dev->ifalias)
new_ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
if (!new_ifalias)
return -ENOMEM;
dev->ifalias = new_ifalias;
strlcpy(dev->ifalias, alias, len+1);
return len;