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authorWei Yongjun <yjwei@cn.fujitsu.com>2009-03-02 09:46:12 +0000
committerDavid S. Miller <davem@davemloft.net>2009-03-02 22:49:17 -0800
commitc6db93a58f1745cfe1acc2e1a1d68afc3245eced (patch)
treeb4e88d10bc75fa6565d91202460fb3f0ed5cc7c5
parentd212318c9d1b11ff44b57f90b4f9d9c9b31a6ced (diff)
sctp: fix the length check in sctp_getsockopt_maxburst()
The code in sctp_getsockopt_maxburst() doesn't allow len to be larger then struct sctp_assoc_value, which is a common case where app writers just pass down the sizeof(buf) or something similar. This patch fix the problem. Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com> Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/sctp/socket.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 4bc558c19fc..bbd3cd238d7 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -5286,7 +5286,8 @@ static int sctp_getsockopt_maxburst(struct sock *sk, int len,
printk(KERN_WARNING
"SCTP: Use struct sctp_assoc_value instead\n");
params.assoc_id = 0;
- } else if (len == sizeof (struct sctp_assoc_value)) {
+ } else if (len >= sizeof(struct sctp_assoc_value)) {
+ len = sizeof(struct sctp_assoc_value);
if (copy_from_user(&params, optval, len))
return -EFAULT;
} else