| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.18 117/121] vti6: better validate user provided tunnel names | Date | Wed, 11 Apr 2018 20:37:00 +0200 |
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3.18-stable review patch. If anyone has any objections, please let me know.
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From: Eric Dumazet <edumazet@google.com>
[ Upstream commit 537b361fbcbcc3cd6fe2bb47069fd292b9256d16 ]
Use valid_name() to make sure user does not provide illegal device name.
Fixes: ed1efb2aefbb ("ipv6: Add support for IPsec virtual tunnel interfaces") Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- net/ipv6/ip6_vti.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
--- a/net/ipv6/ip6_vti.c +++ b/net/ipv6/ip6_vti.c @@ -195,10 +195,13 @@ static struct ip6_tnl *vti6_tnl_create(s char name[IFNAMSIZ]; int err; - if (p->name[0]) + if (p->name[0]) { + if (!dev_valid_name(p->name)) + goto failed; strlcpy(name, p->name, IFNAMSIZ); - else + } else { sprintf(name, "ip6_vti%%d"); + } dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, vti6_dev_setup); if (dev == NULL)
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