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Merge pull request #40283 from saschagrunert/lgetxattr-panic

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Fix possible runtime panic in Lgetxattr
This commit is contained in:
Kirill Kolyshkin 2019-12-04 19:48:52 -08:00 committed by GitHub
commit d163fbba3c
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1 changed files with 15 additions and 6 deletions
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21
pkg/system/xattrs_linux.go
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@ -6,19 +6,28 @@ import "golang.org/x/sys/unix"
// and associated with the given path in the file system.
// It will returns a nil slice and nil error if the xattr is not set.
func Lgetxattr(path string, attr string) ([]byte, error) {
// Start with a 128 length byte array
dest := make([]byte, 128)
sz, errno := unix.Lgetxattr(path, attr, dest)
if errno == unix.ENODATA {
switch {
case errno == unix.ENODATA:
return nil, nil
}
if errno == unix.ERANGE {
case errno == unix.ERANGE:
// 128 byte array might just not be good enough. A dummy buffer is used
// to get the real size of the xattrs on disk
sz, errno = unix.Lgetxattr(path, attr, []byte{})
if errno != nil {
return nil, errno
}
dest = make([]byte, sz)
sz, errno = unix.Lgetxattr(path, attr, dest)
}
if errno != nil {
if errno != nil {
return nil, errno
}
case errno != nil:
return nil, errno
}
return dest[:sz], nil
}