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Fix conversion overflow false positive when using ParseUint

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This commit is contained in:
Ben Krieger 2024-08-27 13:11:51 -04:00 committed by Cosmin Cojocar
parent c52dc0ea4e
commit 4ae73c8ba3
2 changed files with 37 additions and 2 deletions
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5
analyzers/conversion_overflow.go
View file

@ -134,9 +134,10 @@ func isStringToIntConversion(instr *ssa.Convert, dstType string) bool {
for {
switch v := original.(type) {
case *ssa.Call:
if v.Call.StaticCallee() != nil && v.Call.StaticCallee().Name() == "ParseInt" {
if v.Call.StaticCallee() != nil && (v.Call.StaticCallee().Name() == "ParseInt" || v.Call.StaticCallee().Name() == "ParseUint") {
if len(v.Call.Args) == 3 {
if bitSize, ok := v.Call.Args[2].(*ssa.Const); ok {
signed := v.Call.StaticCallee().Name() == "ParseInt"
bitSizeValue, err := strconv.Atoi(bitSize.Value.String())
if err != nil {
return false
@ -145,7 +146,7 @@ func isStringToIntConversion(instr *ssa.Convert, dstType string) bool {
if err != nil {
return false
}
isSafe := bitSizeValue <= dstInt.size
isSafe := bitSizeValue <= dstInt.size && signed == dstInt.signed
return isSafe
}
}

34
testutils/g115_samples.go
View file

@ -356,4 +356,38 @@ func main() {
}
`,
}, 0, gosec.NewConfig()},
{[]string{
`
package main
import (
"fmt"
"strconv"
)
func main() {
var a string = "13"
b, _ := strconv.ParseUint(a, 10, 8)
c := uint8(b)
fmt.Printf("%d\n", c)
}
`,
}, 0, gosec.NewConfig()},
{[]string{
`
package main
import (
"fmt"
"strconv"
)
func main() {
var a string = "13"
b, _ := strconv.ParseInt(a, 10, 8)
c := uint8(b)
fmt.Printf("%d\n", c)
}
`,
}, 1, gosec.NewConfig()},
}