From 5a742b94f01a279c370fb682d03ebdd0d750c6e4 Mon Sep 17 00:00:00 2001
From: Moinak Ghosh <moinakg@gmail.com>
Date: Mon, 3 Nov 2014 23:32:12 +0530
Subject: [PATCH] Add checksum verification of metadata chunks.

---
 meta_stream.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/meta_stream.c b/meta_stream.c
index 1ed0ce6..61f9a78 100644
--- a/meta_stream.c
+++ b/meta_stream.c
@@ -327,6 +327,7 @@ decompress_data(meta_ctx_t *mctx)
 		/*
 		 * Verify Header CRC32 in non-crypto mode.
 		 */
+		deserialize_checksum(checksum, cbuf + 25, pctx->cksum_bytes);
 		crc1 = U32_P(cbuf + 25 + CKSUM_MAX);
 		memset(cbuf + 25 + CKSUM_MAX, 0, CRC32_SIZE);
 		crc2 = lzma_crc32(cbuf, METADATA_HDR_SZ, 0);
@@ -361,6 +362,18 @@ decompress_data(meta_ctx_t *mctx)
 		}
 		memcpy(ubuf, cseg, dstlen);
 	}
+
+	/*
+	 * Now verify normal checksum if not using encryption.
+	 */
+	if (!pctx->encrypt_type) {
+		compute_checksum(mctx->checksum, pctx->cksum, ubuf, dstlen, 0, 1);
+		if (memcmp(checksum, mctx->checksum, pctx->cksum_bytes) != 0) {
+			log_msg(LOG_ERR, 0, "Metadata chunk %d, Checksum verification failed",
+				mctx->id);
+			return (0);
+		}
+	}
 	mctx->topos = 0;
 	mctx->tosize = dstlen;
 	return (1);