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av_fast_padded_mallocz

API Overview​

av_fast_padded_mallocz is an API in FFmpeg. This rule belongs to the api pair type. This rule is generated using ChatDetector.

Rule Description​

tip

Parameter 2 of av_fast_padded_mallocz must be released by calling av_freep, with the same object passed as the 2-th argument to av_freep

info
  • Tags: api pair
  • Parameter Index: 1
  • CWE Type: CWE-404

Rule Code​

import cpp
import semmle.code.cpp.dataflow.new.DataFlow


DataFlow::Node getSource(FunctionCall fc){
  fc.getTarget().hasName("av_fast_padded_mallocz")
  and result.asExpr() = fc.getArgument(1)
}

DataFlow::Node getSink(FunctionCall fc){
  fc.getTarget().hasName("av_freep")
  and result.asExpr() = fc.getArgument(1)
}

FunctionCall freeTarget(FunctionCall malloc){
  DataFlow::localFlow(getSource(malloc), getSink(result))
}

from FunctionCall fc
where fc.getTarget().hasName("av_fast_padded_mallocz")
      and not exists(
        FunctionCall free| 
        free = freeTarget(fc)
      )
select fc.getLocation()