[PATCH] in cifssmb.c add copy_from_user return value check and do minor formatting/whitespace cleanups.

[Jesper Juhl]

Hi, 

Seeing this warning :

fs/cifs/cifssmb.c:902: warning: ignoring return value of `copy_from_user', declared with attribute warn_unused_result

lead to the following patch.

The patch adds a check of the copy_from_user return value and returns 
-EFAULT if the call fails. In addition to that I did some 
formatting/whitespace changes - the code uses primarily tabs for 
indentation, but this little bit used spaces, so I changed that to tabs; I 
also added a few curly braces {} for a few if statements, in the same 
area, that seemed to be becomming quite hard to read without.

Patch has been compile tested, but I have no real way to test it properly 
beyond that. 
I hope the patch is acceptable and mergable :)

Btw, I'm only subscribed to LKML, so please keep me on CC.


Signed-off-by: Jesper Juhl <juhl-lkml at dif.dk>

diff -up linux-2.6.10-rc3-bk13-orig/fs/cifs/cifssmb.c linux-2.6.10-rc3-bk13/fs/cifs/cifssmb.c
--- linux-2.6.10-rc3-bk13-orig/fs/cifs/cifssmb.c	2004-12-20 22:19:42.000000000 +0100
+++ linux-2.6.10-rc3-bk13/fs/cifs/cifssmb.c	2004-12-22 00:21:38.000000000 +0100
@@ -895,14 +895,19 @@ CIFSSMBWrite(const int xid, struct cifsT
 		bytes_sent = count;
 	pSMB->DataLengthHigh = 0;
 	pSMB->DataOffset =
-	    cpu_to_le16(offsetof(struct smb_com_write_req,Data) - 4);
-    if(buf)
-	    memcpy(pSMB->Data,buf,bytes_sent);
-	else if(ubuf)
-		copy_from_user(pSMB->Data,ubuf,bytes_sent);
-    else {
+		cpu_to_le16(offsetof(struct smb_com_write_req,Data) - 4);
+
+	if (buf) {
+		memcpy(pSMB->Data,buf,bytes_sent);
+	} else if (ubuf) {
+		if (copy_from_user(pSMB->Data,ubuf,bytes_sent)) {
+			if (pSMB)
+				cifs_buf_release(pSMB);
+			return -EFAULT;
+		}
+	} else {
 		/* No buffer */
-		if(pSMB)
+		if (pSMB)
 			cifs_buf_release(pSMB);
 		return -EINVAL;
 	}