patch-1.3.75 linux/net/ipv4/tcp.c

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diff -u --recursive --new-file v1.3.74/linux/net/ipv4/tcp.c linux/net/ipv4/tcp.c
@@ -1042,6 +1042,11 @@
 				copy = sk->mss;
 			if (copy > seglen)
 				copy = seglen;
+			if (copy <= 0) 
+			{
+				printk("TCP: **bug**: copy=%d, sk->mss=%d\n", copy, sk->mss);
+		  		return -EFAULT;
+			}
 
 		/*
 		 *	We should really check the window here also. 

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