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bio_write

API Overview​

BIO_write is an API in openssl. This rule belongs to the return value check type. This rule is generated using AURC.

Rule Description​

tip

BIO_write() returns -2 if the "write" operation is not implemented by the BIO or -1 on other errors. Otherwise it returns the number of bytes written. This may be 0 if the BIO I<b> is NULL or I<dlen <= 0>.

info
  • Tags: return value check
  • Parameter Index: N/A
  • CWE Type: CWE-253

Rule Code​

import cpp

class OpenSSLFunctionCall extends FunctionCall {
  OpenSSLFunctionCall() {
    this.getTarget().hasName("BIO_write")
  }
}

from OpenSSLFunctionCall call, UnaryOperation uop
where
  uop.getOperator() = "!" and
  uop.getOperand() = call.getAnAccess()
select uop, "This negation checks the return value of BIO_write."