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evp_decodeupdate

API Overview​

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

Rule Description​

tip

EVP_DecodeUpdate() returns -1 on error and 0 or 1 on success. If 0 is returned then no more non-padding base 64 characters are expected.

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("EVP_DecodeUpdate")
  }
}

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