[patch 24/60] dccp: change L/R must have at least one byte in thedccpsf_val field

[Greg KH]

2.6.26-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>

commit 3e8a0a559c66ee9e7468195691a56fefc3589740 upstream

Thanks to Eugene Teo for reporting this problem.

Signed-off-by: Eugene Teo <eugeneteo@xxxxxxxxx>
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Signed-off-by: Gerrit Renker <gerrit@xxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 net/dccp/proto.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/net/dccp/proto.c
+++ b/net/dccp/proto.c
@@ -476,6 +476,11 @@ static int dccp_setsockopt_change(struct
 
 	if (copy_from_user(&opt, optval, sizeof(opt)))
 		return -EFAULT;
+	/*
+	 * rfc4340: 6.1. Change Options
+	 */
+	if (opt.dccpsf_len < 1)
+		return -EINVAL;
 
 	val = kmalloc(opt.dccpsf_len, GFP_KERNEL);
 	if (!val)

-- 
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