GNS3/dynamips

A potential bug of unchecked return value to null pointer dereference(3)

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hello,I found a potential bug of unchecked return value to null pointer dereference in source code of dynamips , would you help me check whether this bug is ture?thank you for your effort and patience very much.

step 1 :
In file dynamips/common/net.c , function ip_parse_cidr line 114 :
Function strchr executes and stores the return value to sl (sl can be null)

step 2 :
In file dynamips/common/net.c , function ip_parse_cidr line 115 :
Store 0 to sl

Fixed in #210