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authorJulia Lawall <julia@diku.dk>2010-05-21 22:25:19 +0000
committerDavid S. Miller <davem@davemloft.net>2010-05-31 00:24:14 -0700
commit042604d2a3ee59c84f8293988caf35bac5de9eb3 (patch)
treee34f3eb3211ed0c6ab69cda79ebe66e6752d106d /net/dccp
parentc146fc9fc9bc1dc0f629fe83d49f32ab0f11bfdc (diff)
downloadvexpress-lsk-042604d2a3ee59c84f8293988caf35bac5de9eb3.tar.gz
net/dccp: Use memdup_user
Use memdup_user when user data is immediately copied into the allocated region. The semantic patch that makes this change is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ expression from,to,size,flag; position p; identifier l1,l2; @@ - to = \(kmalloc@p\|kzalloc@p\)(size,flag); + to = memdup_user(from,size); if ( - to==NULL + IS_ERR(to) || ...) { <+... when != goto l1; - -ENOMEM + PTR_ERR(to) ...+> } - if (copy_from_user(to, from, size) != 0) { - <+... when != goto l2; - -EFAULT - ...+> - } // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Acked-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/dccp')
-rw-r--r--net/dccp/proto.c11
1 files changed, 3 insertions, 8 deletions
diff --git a/net/dccp/proto.c b/net/dccp/proto.c
index b03ecf6b2bb..f79bcef5088 100644
--- a/net/dccp/proto.c
+++ b/net/dccp/proto.c
@@ -473,14 +473,9 @@ static int dccp_setsockopt_ccid(struct sock *sk, int type,
if (optlen < 1 || optlen > DCCP_FEAT_MAX_SP_VALS)
return -EINVAL;
- val = kmalloc(optlen, GFP_KERNEL);
- if (val == NULL)
- return -ENOMEM;
-
- if (copy_from_user(val, optval, optlen)) {
- kfree(val);
- return -EFAULT;
- }
+ val = memdup_user(optval, optlen);
+ if (IS_ERR(val))
+ return PTR_ERR(val);
lock_sock(sk);
if (type == DCCP_SOCKOPT_TX_CCID || type == DCCP_SOCKOPT_CCID)