From 58e3b830e9a6826fef8950bccd7b173bf56de8b2 Mon Sep 17 00:00:00 2001
From: Max Kellermann <max.kellermann@gmail.com>
Date: Thu, 16 May 2024 13:58:56 +0200
Subject: [PATCH] lib/nfs/FileReader: clear the read_buffer in CancelRead()

Fixes assertion failure with libnfs 6.
---
 src/lib/nfs/FileReader.cxx | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/lib/nfs/FileReader.cxx b/src/lib/nfs/FileReader.cxx
index 71bcc74c6..da045332f 100644
--- a/src/lib/nfs/FileReader.cxx
+++ b/src/lib/nfs/FileReader.cxx
@@ -138,7 +138,14 @@ void
 NfsFileReader::CancelRead() noexcept
 {
 	if (state == State::READ) {
-		connection->Cancel(*this, nullptr, {});
+		DisposablePointer dispose_value{};
+
+#ifdef LIBNFS_API_2
+		assert(read_buffer);
+		dispose_value = ToDeleteArray(read_buffer.release());
+#endif
+
+		connection->Cancel(*this, nullptr, std::move(dispose_value));
 		state = State::IDLE;
 	}
 }