https://bz.apache.org/bugzilla/show_bug.cgi?id=60400
Bug ID: 60400
Summary: HttpServletRequest.getReader doesn't correctly read
data
Product: Tomcat 8
Version: 8.5.8
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Catalina
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ----
The HttpServletRequest.getReader doesn't correctly read large entity and
returns more data than expected.
This happens only with version 8.5.8 (working fine on 8.5.6).
I was able to reproduce this with a really simple web app where the issue is
occurring for entity larger that 12288 characters.
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws
IOException{
StringBuilder builder = new StringBuilder();
try(BufferedReader reader = req.getReader()){
String line;
while((line = reader.readLine()) != null){
builder.append(line);
}
}
resp.getWriter().println(req.getContentLength() + " " +
builder.length());
resp.getWriter().println(builder);
}
Then I use this command and I'm able to compare input and parsed data:
cat /dev/urandom | tr -dc 'a-zA-Z0-9' | head -c 12289 > input && curl -X POST
http://localhost:8080/example -d @input > output
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