Commit 3227b51e authored by Alexander Potapenko's avatar Alexander Potapenko Committed by Greg Kroah-Hartman

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


[ Upstream commit c28294b9 ]

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: default avatarAlexander Potapenko <glider@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 8afcfa55
......@@ -1251,8 +1251,9 @@ 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;
}
......
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