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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_bsd.go
+12 -3
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@@ -81,7 +81,10 @@ func Lgetxattr(link string, attr string, dest []byte) (sz int, err error) {
// flags are unused on FreeBSD
func Fsetxattr(fd int, attr string, data []byte, flags int) (err error) {
d := unsafe.Pointer(&data[0])
var d unsafe.Pointer
if len(data) > 0 {
d = unsafe.Pointer(&data[0])
}
datasiz := len(data)
nsid, a, err := xattrnamespace(attr)
@@ -94,7 +97,10 @@ func Fsetxattr(fd int, attr string, data []byte, flags int) (err error) {
}
func Setxattr(file string, attr string, data []byte, flags int) (err error) {
d := unsafe.Pointer(&data[0])
var d unsafe.Pointer
if len(data) > 0 {
d = unsafe.Pointer(&data[0])
}
datasiz := len(data)
nsid, a, err := xattrnamespace(attr)
@@ -107,7 +113,10 @@ func Setxattr(file string, attr string, data []byte, flags int) (err error) {
}
func Lsetxattr(link string, attr string, data []byte, flags int) (err error) {
d := unsafe.Pointer(&data[0])
var d unsafe.Pointer
if len(data) > 0 {
d = unsafe.Pointer(&data[0])
}
datasiz := len(data)
nsid, a, err := xattrnamespace(attr)