[Cluster-devel] [RFC PATCH dlm/next 13/16] fs: dlm: check on minimum header size
Alexander Aring
aahringo at redhat.com
Fri Nov 13 22:58:11 UTC 2020
As I experienced invalid header length e.g. worst-case zero triggers an
endless loop inside the receive handling, because we don't increment any
consumed bytes. This patch will add also a check for the minimum size of
a dlm message inside the dlm header length field.
Signed-off-by: Alexander Aring <aahringo at redhat.com>
---
fs/dlm/midcomms.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/dlm/midcomms.c b/fs/dlm/midcomms.c
index b146842be54a..139d87f1ba17 100644
--- a/fs/dlm/midcomms.c
+++ b/fs/dlm/midcomms.c
@@ -95,7 +95,8 @@ int dlm_process_incoming_buffer(int nodeid, unsigned char *buf, int len)
* cannot deliver this message to upper layers
*/
msglen = le16_to_cpu(hd->h_length);
- if (msglen > DEFAULT_BUFFER_SIZE) {
+ if (msglen > DEFAULT_BUFFER_SIZE ||
+ msglen < sizeof(struct dlm_header)) {
log_print("received invalid length header: %u, will abort message parsing",
msglen);
return -EBADMSG;
--
2.26.2
More information about the Cluster-devel
mailing list