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kcm: return immediately after copy_from_user() failure

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[ Upstream commit a80db69e47d764bbcaf2fec54b1f308925e7c490 ]

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

Fixes: ab7ac4eb9832 ("kcm: Kernel Connection Multiplexor module")
Cc: Tom Herbert <tom@herbertland.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
WANG Cong 2017-03-23 11:03:31 -07:00 committed by Greg Kroah-Hartman
parent c63d618007
commit d60d4e8c1b
1 changed files with 3 additions and 3 deletions
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6
net/kcm/kcmsock.c
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@ -1685,7 +1685,7 @@ 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);
@ -1695,7 +1695,7 @@ 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);
@ -1706,7 +1706,7 @@ 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);