[Cluster-devel] [PATCH 1/3] libcman: fix possible string nontermination: node name

[Jan Pokorný <jpokorny@redhat.com>]

Haven't tested it, but it seems that if node.cn_name has 254 non-null
bytes (should be otherwise perfectly valid, actual characters number
may vary due to utf-8), it will pester later in the processing due
to not being null-terminated (depends whether 255th byte being
accidentally zero), strcmp in find_node_by_name being the first
troublesome place in row.

After this change and taking preceding condition into account,
the situation should be safe.

Signed-off-by: Jan Pokorn? <jpokorny@redhat.com>
---
 cman/lib/libcman.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cman/lib/libcman.c b/cman/lib/libcman.c
index 6ed8ecb..012047d 100644
--- a/cman/lib/libcman.c
+++ b/cman/lib/libcman.c
@@ -685,7 +685,7 @@ int cman_get_node(cman_handle_t handle, int nodeid, cman_node_t *node)
 	}
 
 	cman_node.node_id = nodeid;
-	strncpy(cman_node.name, node->cn_name, sizeof(cman_node.name) - 1);
+	strncpy(cman_node.name, node->cn_name, sizeof(cman_node.name));
 	status = info_call(h, CMAN_CMD_GETNODE, &cman_node, sizeof(struct cl_cluster_node),
 			   &cman_node, sizeof(struct cl_cluster_node));
 	if (status < 0)
-- 
1.7.11.4