[NET]: sparse warning fixes

Fix a bunch of sparse warnings. Mostly about 0 used as
NULL pointer, and shadowed variable declarations.
One notable case was that hash size should have been unsigned.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 3 deletions

diff --git a/net/core/scm.c b/net/core/scm.c
index 44c4ec2c8769..530bee8d9ed9 100644
--- a/net/core/scm.c
+++ b/net/core/scm.c
@@ -167,7 +167,8 @@ error:
 
 int put_cmsg(struct msghdr * msg, int level, int type, int len, void *data)
 {
-        struct cmsghdr __user *cm = (struct cmsghdr __user *)msg->msg_control;
+        struct cmsghdr __user *cm
+                = (__force struct cmsghdr __user *)msg->msg_control;
         struct cmsghdr cmhdr;
         int cmlen = CMSG_LEN(len);
         int err;
@@ -202,7 +203,8 @@ out:
 
 void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm)
 {
-        struct cmsghdr __user *cm = (struct cmsghdr __user*)msg->msg_control;
+        struct cmsghdr __user *cm
+                = (__force struct cmsghdr __user*)msg->msg_control;
 
         int fdmax = 0;
         int fdnum = scm->fp->count;
@@ -222,7 +224,8 @@ void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm)
         if (fdnum < fdmax)
                 fdmax = fdnum;
 
-        for (i=0, cmfptr=(int __user *)CMSG_DATA(cm); i<fdmax; i++, cmfptr++)
+        for (i=0, cmfptr=(__force int __user *)CMSG_DATA(cm); i<fdmax;
+             i++, cmfptr++)
         {
                 int new_fd;
                 err = security_file_receive(fp[i]);