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unix: avoid index out of range in *setxattr on BSD

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Passing an empty data []byte to Fsetxattr/Setxattr/Lsetxattr leads
to an index out of range panic. Fix this by passing an nil
unsafe.Pointer to the underlying syscall in this case.

Change-Id: I5ef3983c6304c5317ed5b49afc4ed19791864dbb
Reviewed-on: https://go-review.googlesource.com/c/146198
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Tobias Klauser
2018-10-31 14:35:58 +00:00
committed by Tobias Klauser
parent 7e31e0c00f
commit 9b800f95db
2 changed files with 19 additions and 4 deletions
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unix/xattr_test.go
+7 -1
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@@ -24,13 +24,19 @@ func TestXattr(t *testing.T) {
xattrName := "user.test"
xattrDataSet := "gopher"
err := unix.Setxattr(f, xattrName, []byte(xattrDataSet), 0)
err := unix.Setxattr(f, xattrName, []byte{}, 0)
if err == unix.ENOTSUP || err == unix.EOPNOTSUPP {
t.Skip("filesystem does not support extended attributes, skipping test")
} else if err != nil {
t.Fatalf("Setxattr: %v", err)
}
err = unix.Setxattr(f, xattrName, []byte(xattrDataSet), 0)
if err != nil {
t.Fatalf("Setxattr: %v", err)
}
// find size
size, err := unix.Listxattr(f, nil)
if err != nil {