4.4-stable review patch. If anyone has any objections, please let me know.
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From: Sultan Alsawaf sultanxda@gmail.com
commit 000ade8016400d93b4d7c89970d96b8c14773d45 upstream.
By passing a limit of 2 bytes to strncat, strncat is limited to writing fewer bytes than what it's supposed to append to the name here.
Since the bounds are checked on the line above this, just remove the string bounds checks entirely since they're unneeded.
Signed-off-by: Sultan Alsawaf sultanxda@gmail.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- net/ipv4/ip_tunnel.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/net/ipv4/ip_tunnel.c +++ b/net/ipv4/ip_tunnel.c @@ -261,8 +261,8 @@ static struct net_device *__ip_tunnel_cr } else { if (strlen(ops->kind) > (IFNAMSIZ - 3)) goto failed; - strlcpy(name, ops->kind, IFNAMSIZ); - strncat(name, "%d", 2); + strcpy(name, ops->kind); + strcat(name, "%d"); }
ASSERT_RTNL();