fix error in base64EncodedSize() #2160
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The base64 encoder called by XmlRpcValue.cpp may write two newlines to the end of the encoded string, but this is not accounted for in base64EncodedSize(). This results in a buffer overflow, which then causes ROS UDP Transport connection setup to fail. One case which results in the double newline is when the total length of "node_name + topic_name + msg_type" is 33 bytes. Signed-off-by: Mike Scheutzow <mjs973@hotmail.com>
Signed-off-by: Mike Scheutzow <mjs973@hotmail.com>
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Thanks for the patch! Could you provide a complete code example that I can run to verify the bug and fix? Also, could you target the latest development branch ( |
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I've had this same issue in ROS noetic, my question with a code example that you can run is here: https://robotics.stackexchange.com/questions/104346/issue-with-rostopic-name-length-affecting-node-communication) |
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I have been debugging an issue where no messages are delivered over UDP Transport. I'm on melodic, ubuntu 18.04, x86_64 cpu. Here is what I found.
The base64 encoder called by XmlRpcValue.cpp may write two newlines to the end of the encoded string, but this is not accounted for in base64EncodedSize(). This results in a buffer overflow, which then causes ROS UDP Transport connection setup to fail.
One case which results in the double newline is when the total length of "node_name + topic_name + msg_type" is 33 bytes.