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License: MIT License
Having invalid data in decoder input is not something exceptional, very often decoder input is provided by an untrusted external party. Invalid data should be handled with errors, not panics.
Discovered with a fuzz test.
// +build gofuzzbeta
package request_test
import (
"context"
"net/http"
"testing"
"github.com/swaggest/rest/request"
)
func FuzzParseQuery(f *testing.F) {
df := request.NewDecoderFactory()
input := new(struct {
InQuery map[int]float64 `query:"in_query"`
})
dec := df.MakeDecoder(http.MethodGet, input, nil)
f.Add("/?in_query[1]=1.0&in_query[2]=2.1&in_query[3]=0")
f.Fuzz(func(t *testing.T, queryStr string) {
req, err := http.NewRequestWithContext(context.Background(), http.MethodGet,
queryStr, nil)
if err != nil {
t.Fatalf("ParseQuery failed to decode a valid encoded query %s: %v", queryStr, err)
}
err = dec.Decode(req, &input, nil)
if err != nil {
t.Skip()
}
})
}
gotip test --fuzz=FuzzParseQuery
2021/06/04 12:13:18 invalid formatting for key 'in_quer[1]]' missing '[' bracket
2021/06/04 12:13:18 invalid formatting for key 'inWque]y[1r' missing '[' bracket
found a crash, minimizing...
2021/06/04 12:13:18 invalid formatting for key 'inWque]y[1r' missing '[' bracket
2021/06/04 12:13:18 invalid formatting for key 'inWque]y' missing '[' bracket
2021/06/04 12:13:18 invalid formatting for key 'inWque]' missing '[' bracket
2021/06/04 12:13:18 invalid formatting for key 'inWque]' missing '[' bracket
2021/06/04 12:13:18 invalid formatting for key 'nWque]' missing '[' bracket
2021/06/04 12:13:18 invalid formatting for key 'Wque]' missing '[' bracket
2021/06/04 12:13:18 invalid formatting for key 'que]' missing '[' bracket
2021/06/04 12:13:18 invalid formatting for key 'ue]' missing '[' bracket
2021/06/04 12:13:18 invalid formatting for key 'e]' missing '[' bracket
2021/06/04 12:13:18 invalid formatting for key ']' missing '[' bracket
fuzzing, elapsed: 1.0s, execs: 13 (12/sec), workers: 8, interesting: 2
--- FAIL: FuzzParseQuery (1.05s)
panic: invalid formatting for key ']' missing '[' bracket
goroutine 59 [running]:
runtime/debug.Stack()
/Users/viacheslavpoturaev/sdk/gotip/src/runtime/debug/stack.go:24 +0x90
testing.tRunner.func1.2({0x14d85c0, 0xc000154d40})
/Users/viacheslavpoturaev/sdk/gotip/src/testing/testing.go:1271 +0x267
testing.tRunner.func1()
/Users/viacheslavpoturaev/sdk/gotip/src/testing/testing.go:1278 +0x218
panic({0x14d85c0, 0xc000154d40})
/Users/viacheslavpoturaev/sdk/gotip/src/runtime/panic.go:1038 +0x215
log.Panicf({0x1573104, 0x1}, {0xc0000b6eb8, 0x0, 0x0})
/Users/viacheslavpoturaev/sdk/gotip/src/log/log.go:361 +0x74
github.com/swaggest/form/v5.(*decoder).parseMapData(0xc0000a46c0)
/Users/viacheslavpoturaev/go/pkg/mod/github.com/swaggest/form/[email protected]/decoder.go:80 +0x4bd
github.com/swaggest/form/v5.(*decoder).setFieldByType(0xc0000a46c0, {0x14cf860, 0xc0000a2098, 0x1943108}, 0x0, {0xc0000a0740, 0x0, 0x40}, 0x0)
/Users/viacheslavpoturaev/go/pkg/mod/github.com/swaggest/form/[email protected]/decoder.go:705 +0x3615
github.com/swaggest/form/v5.(*Decoder).Decode(0xc0000ecf00, {0x14c7e60, 0xc0000a2098}, 0xc000162c30, {0x0, 0x0, 0x1551a00})
/Users/viacheslavpoturaev/go/pkg/mod/github.com/swaggest/form/[email protected]/form_decoder.go:167 +0x628
github.com/swaggest/rest/request.makeDecoder.func1(0x0, {0x14c7e60, 0xc0000a2098}, {0x0, 0x0})
/Users/viacheslavpoturaev/dev/rest/request/decoder.go:40 +0x109
github.com/swaggest/rest/request.(*decoder).Decode(0xc0001629f0, 0xc0000a6008, {0x14c7e60, 0xc0000a2098}, {0x0, 0x0})
/Users/viacheslavpoturaev/dev/rest/request/decoder.go:55 +0xfe
github.com/swaggest/rest/request_test.FuzzParseQuery.func1(0xc000283040, {0xc00015e7c6, 0x2})
/Users/viacheslavpoturaev/dev/rest/request/decoder_fuzz_test.go:28 +0x184
reflect.Value.call({0x14dc880, 0xc0000deb60, 0x13}, {0x155d746, 0x4}, {0xc000162bd0, 0x2, 0x2})
/Users/viacheslavpoturaev/sdk/gotip/src/reflect/value.go:543 +0xf0d
reflect.Value.Call({0x14dc880, 0xc0000deb60, 0xc00015e7c8}, {0xc000162bd0, 0x2, 0x2})
/Users/viacheslavpoturaev/sdk/gotip/src/reflect/value.go:339 +0x13e
testing.(*F).Fuzz.func1.1(0x0)
/Users/viacheslavpoturaev/sdk/gotip/src/testing/fuzz.go:347 +0x193
testing.tRunner(0xc000283040, 0xc000122930)
/Users/viacheslavpoturaev/sdk/gotip/src/testing/testing.go:1325 +0x102
created by testing.(*F).Fuzz.func1
/Users/viacheslavpoturaev/sdk/gotip/src/testing/fuzz.go:341 +0x545
--- FAIL: FuzzParseQuery (0.00s)
Crash written to testdata/corpus/FuzzParseQuery/d54b2cdb8e76ab6be16c0a5d935ea8ff855df4018291b84bf05f54759ac0b96c
To re-run:
go test github.com/swaggest/rest/request -run=FuzzParseQuery/d54b2cdb8e76ab6be16c0a5d935ea8ff855df4018291b84bf05f54759ac0b96c
FAIL
exit status 1
FAIL github.com/swaggest/rest/request 1.274s
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