libbinder_rs: Handle empty args list for dump transactions
Previously we expected the args pointer passed to the handler for dump
transactions to be non-null. If there are no arguments this
pointer may be null and we should pass an empty args list instead of
erroring out.
Bug: 232887857
Test: atest -p frameworks/native/libs/binder
Test: cts -m CtsSecurityTestCases -t android.security.cts.ServicePermissionsTest#testDumpProtected
Change-Id: If2b08c688a374913ef0913749efc72db07e7776f
diff --git a/libs/binder/rust/src/native.rs b/libs/binder/rust/src/native.rs
index b7c7ae4..3edeebf 100644
--- a/libs/binder/rust/src/native.rs
+++ b/libs/binder/rust/src/native.rs
@@ -335,11 +335,16 @@
// We don't own this file, so we need to be careful not to drop it.
let file = ManuallyDrop::new(File::from_raw_fd(fd));
- if args.is_null() {
+ if args.is_null() && num_args != 0 {
return StatusCode::UNEXPECTED_NULL as status_t;
}
- let args = slice::from_raw_parts(args, num_args as usize);
- let args: Vec<_> = args.iter().map(|s| CStr::from_ptr(*s)).collect();
+
+ let args = if args.is_null() || num_args == 0 {
+ vec![]
+ } else {
+ slice::from_raw_parts(args, num_args as usize)
+ .iter().map(|s| CStr::from_ptr(*s)).collect()
+ };
let object = sys::AIBinder_getUserData(binder);
let binder: &T = &*(object as *const T);