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Commit a80db69e authored by WANG Cong's avatar WANG Cong Committed by David S. Miller
Browse files

kcm: return immediately after copy_from_user() failure 



There is no reason to continue after a copy_from_user()
failure.

Fixes: ab7ac4eb ("kcm: Kernel Connection Multiplexor module")
Cc: Tom Herbert <tom@herbertland.com>
Signed-off-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent a5af8392

net/kcm/kcmsock.c

+3 −3
Original line number Diff line number Diff line
@@ -1687,7 +1687,7 @@ static int kcm_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 
		struct kcm_attach info;



		if (copy_from_user(&info, (void __user *)arg, sizeof(info)))

			err = -EFAULT;

			return -EFAULT;



		err = kcm_attach_ioctl(sock, &info);
@@ -1697,7 +1697,7 @@ static int kcm_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 
		struct kcm_unattach info;



		if (copy_from_user(&info, (void __user *)arg, sizeof(info)))

			err = -EFAULT;

			return -EFAULT;



		err = kcm_unattach_ioctl(sock, &info);
@@ -1708,7 +1708,7 @@ static int kcm_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 
		struct socket *newsock = NULL;



		if (copy_from_user(&info, (void __user *)arg, sizeof(info)))

			err = -EFAULT;

			return -EFAULT;



		err = kcm_clone(sock, &info, &newsock);