diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c
index fafd056..957ca18 100644
--- a/fs/cifs/misc.c
+++ b/fs/cifs/misc.c
@@ -170,11 +170,17 @@ cifs_buf_get(void)
 void
 cifs_buf_release(void *buf_to_free)
 {
-
+	struct smb_hdr *smb;
 	if (buf_to_free == NULL) {
 		/* cFYI(1, ("Null buffer passed to cifs_buf_release"));*/
 		return;
 	}
+	smb = (struct smb_hdr *)buf_to_free;
+	if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff)) {
+		  dump_stack();
+		  BUG();
+	}
+
 	mempool_free(buf_to_free,cifs_req_poolp);
 
 	atomic_dec(&bufAllocCount);