From 3f91bd420a955803421f2db17b2e04aacfbb2bb8 Mon Sep 17 00:00:00 2001 From: Sam Ravnborg Date: Sat, 26 Apr 2008 22:57:25 -0700 Subject: [PATCH] can: Fix copy_from_user() results interpretation Both copy_to_ and _from_user return the number of bytes, that failed to reach their destination, not the 0/-EXXX values. Based on patch from Pavel Emelyanov Signed-off-by: Sam Ravnborg Acked-by: Oliver Hartkopp Signed-off-by: David S. Miller --- net/can/raw.c | 21 ++++++++++----------- 1 file changed, 10 insertions(+), 11 deletions(-) diff --git a/net/can/raw.c b/net/can/raw.c index 201cbfc6b9..69877b8e7e 100644 --- a/net/can/raw.c +++ b/net/can/raw.c @@ -435,15 +435,13 @@ static int raw_setsockopt(struct socket *sock, int level, int optname, if (!filter) return -ENOMEM; - err = copy_from_user(filter, optval, optlen); - if (err) { + if (copy_from_user(filter, optval, optlen)) { kfree(filter); - return err; + return -EFAULT; } } else if (count == 1) { - err = copy_from_user(&sfilter, optval, optlen); - if (err) - return err; + if (copy_from_user(&sfilter, optval, optlen)) + return -EFAULT; } lock_sock(sk); @@ -493,9 +491,8 @@ static int raw_setsockopt(struct socket *sock, int level, int optname, if (optlen != sizeof(err_mask)) return -EINVAL; - err = copy_from_user(&err_mask, optval, optlen); - if (err) - return err; + if (copy_from_user(&err_mask, optval, optlen)) + return -EFAULT; err_mask &= CAN_ERR_MASK; @@ -531,7 +528,8 @@ static int raw_setsockopt(struct socket *sock, int level, int optname, if (optlen != sizeof(ro->loopback)) return -EINVAL; - err = copy_from_user(&ro->loopback, optval, optlen); + if (copy_from_user(&ro->loopback, optval, optlen)) + return -EFAULT; break; @@ -539,7 +537,8 @@ static int raw_setsockopt(struct socket *sock, int level, int optname, if (optlen != sizeof(ro->recv_own_msgs)) return -EINVAL; - err = copy_from_user(&ro->recv_own_msgs, optval, optlen); + if (copy_from_user(&ro->recv_own_msgs, optval, optlen)) + return -EFAULT; break; -- 2.39.5