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Add missing bounds in ContinueOnError

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ContinueOnError assumes that something of type errcode.Errors contains
at least one error. This is generally true, but might not be true if the
remote registry returns an empty error body or invalid JSON. Add the
bounds check, and in the case where it fails, allow fallbacks to v1.

Fixes #18481

Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>
This commit is contained in:
Aaron Lehmann 2015-12-07 17:28:10 -08:00
parent 5f1af8da5b
commit 1ebfa29954
1 changed files with 3 additions and 0 deletions
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3
registry/registry.go
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@ -213,6 +213,9 @@ func (e ErrNoSupport) Error() string {
func ContinueOnError(err error) bool {
switch v := err.(type) {
case errcode.Errors:
if len(v) == 0 {
return true
}
return ContinueOnError(v[0])
case ErrNoSupport:
return ContinueOnError(v.Err)