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From: Doug Nazar <nazard@nazar.ca>
To: linux-nfs@vger.kernel.org
Subject: [PATCH 07/11] nfsdcld: Don't copy more data than exists in column
Date: Sat, 18 Jul 2020 05:24:17 -0400
Message-ID: <20200718092421.31691-8-nazard@nazar.ca> (raw)
In-Reply-To: <20200718092421.31691-1-nazard@nazar.ca>

Found with valgrind.

Signed-off-by: Doug Nazar <nazard@nazar.ca>
---
 utils/nfsdcld/sqlite.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/utils/nfsdcld/sqlite.c b/utils/nfsdcld/sqlite.c
index 8fd1d0c2..03016fb9 100644
--- a/utils/nfsdcld/sqlite.c
+++ b/utils/nfsdcld/sqlite.c
@@ -1330,20 +1330,26 @@ sqlite_iterate_recovery(int (*cb)(struct cld_client *clnt), struct cld_client *c
 	}
 
 	while ((ret = sqlite3_step(stmt)) == SQLITE_ROW) {
+		const void *id;
+		int id_len;
+
+		id = sqlite3_column_blob(stmt, 0);
+		id_len = sqlite3_column_bytes(stmt, 0);
+		if (id_len > NFS4_OPAQUE_LIMIT)
+			id_len = NFS4_OPAQUE_LIMIT;
+
 		memset(&cmsg->cm_u, 0, sizeof(cmsg->cm_u));
 #if UPCALL_VERSION >= 2
-		memcpy(&cmsg->cm_u.cm_clntinfo.cc_name.cn_id,
-			sqlite3_column_blob(stmt, 0), NFS4_OPAQUE_LIMIT);
-		cmsg->cm_u.cm_clntinfo.cc_name.cn_len = sqlite3_column_bytes(stmt, 0);
+		memcpy(&cmsg->cm_u.cm_clntinfo.cc_name.cn_id, id, id_len);
+		cmsg->cm_u.cm_clntinfo.cc_name.cn_len = id_len;
 		if (sqlite3_column_bytes(stmt, 1) > 0) {
 			memcpy(&cmsg->cm_u.cm_clntinfo.cc_princhash.cp_data,
 				sqlite3_column_blob(stmt, 1), SHA256_DIGEST_SIZE);
 			cmsg->cm_u.cm_clntinfo.cc_princhash.cp_len = sqlite3_column_bytes(stmt, 1);
 		}
 #else
-		memcpy(&cmsg->cm_u.cm_name.cn_id, sqlite3_column_blob(stmt, 0),
-			NFS4_OPAQUE_LIMIT);
-		cmsg->cm_u.cm_name.cn_len = sqlite3_column_bytes(stmt, 0);
+		memcpy(&cmsg->cm_u.cm_name.cn_id, id, id_len);
+		cmsg->cm_u.cm_name.cn_len = id_len;
 #endif
 		cb(clnt);
 	}
-- 
2.26.2


  parent reply index

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-18  9:24 [PATCH 00/11] nfs-utils: Misc cleanups & fixes Doug Nazar
2020-07-18  9:24 ` [PATCH 01/11] Add error handling to libevent allocations Doug Nazar
2020-07-18  9:24 ` [PATCH 02/11] gssd: Fix cccache buffer size Doug Nazar
2020-07-20 14:43   ` Steve Dickson
2020-07-20 15:41     ` Doug Nazar
2020-07-18  9:24 ` [PATCH 03/11] gssd: Fix handling of failed allocations Doug Nazar
2020-07-18  9:24 ` [PATCH 04/11] gssd: srchost should never be * Doug Nazar
2020-07-18  9:24 ` [PATCH 05/11] xlog: Reorganize xlog_backend() to work around -Wmaybe-uninitialized Doug Nazar
2020-07-18  9:24 ` [PATCH 06/11] nfsdcld: Add graceful exit handling and resource cleanup Doug Nazar
2020-07-18  9:24 ` Doug Nazar [this message]
2020-07-18  9:24 ` [PATCH 08/11] svcgssd: Convert to using libevent Doug Nazar
2020-07-18  9:24 ` [PATCH 09/11] nfsidmap: Add support to cleanup resources on exit Doug Nazar
2020-07-20 15:49   ` Steve Dickson
2020-07-20 15:58     ` Doug Nazar
2020-07-20 17:31       ` Steve Dickson
2020-07-18  9:24 ` [PATCH 10/11] svcgssd: Cleanup global " Doug Nazar
2020-07-18  9:24 ` [PATCH 11/11] svcgssd: Wait for nullrpc channel if not available Doug Nazar
2020-07-18 15:55   ` J. Bruce Fields
2020-07-18 18:07     ` Doug Nazar
2020-07-27 14:42 ` [PATCH 00/11] nfs-utils: Misc cleanups & fixes Steve Dickson

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