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net: don't call strlen on non-terminated string in dev_set_alias()

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KMSAN reported a use of uninitialized memory in dev_set_alias(),
which was caused by calling strlcpy() (which in turn called strlen())
on the user-supplied non-terminated string.

Signed-off-by: Alexander Potapenko <glider@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Potapenko 2017-06-06 15:56:54 +02:00 committed by David S. Miller
parent b29794ec95
commit c28294b941
1 changed files with 2 additions and 1 deletions
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3
net/core/dev.c
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@ -1253,8 +1253,9 @@ int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
if (!new_ifalias)
return -ENOMEM;
dev->ifalias = new_ifalias;
memcpy(dev->ifalias, alias, len);
dev->ifalias[len] = 0;
strlcpy(dev->ifalias, alias, len+1);
return len;
}