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Fix panic with substr interpolation function by invalid offset 

Fixes #17041
This commit is contained in:
Masayuki Morita 2018-01-06 00:40:48 +09:00 committed by Masayuki Morita
parent 18975d7270
commit e873af9337
2 changed files with 6 additions and 1 deletions
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2
config/interpolate_funcs.go
View File

@ -1577,7 +1577,7 @@ func interpolationFuncSubstr() ast.Function {
return nil, fmt.Errorf("length should be a non-negative integer") return nil, fmt.Errorf("length should be a non-negative integer")
} }
if offset > len(str) { if offset > len(str) || offset < 0 {
return nil, fmt.Errorf("offset cannot be larger than the length of the string") return nil, fmt.Errorf("offset cannot be larger than the length of the string")
} }

5
config/interpolate_funcs_test.go
View File

@ -2568,6 +2568,11 @@ func TestInterpolateFuncSubstr(t *testing.T) {
nil, nil,
true, true,
}, },
{
`${substr("foo", -4, -1)}`,
nil,
true,
},
// invalid length // invalid length
{ {