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dqget

API Overview​

dqget is an API in Linux kernel. This rule belongs to the return value check type. This rule is generated using APISpecGen.

Rule Description​

tip

dqget returns error pointer on failure, use IS_ERR to check the return value

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

Rule Code​


import cpp
import semmle.code.cpp.controlflow.SSA


class EVPFunctionCall extends FunctionCall {
  EVPFunctionCall() {
    this.getTarget().hasName("dqget")
  }
}


predicate isErrCheckFunction(Function f) {
  f.hasName("IS_ERR") 
}

from EVPFunctionCall call, ValueAccess ret
where
  ret = call.getAnAccess() and
  not exists(FunctionCall check |
    isErrCheckFunction(check.getTarget()) and
    check.getArgument(0).getAChild*() = ret
  )
select call, "The return value of dqget is not checked with IS_ERR."