From 6ba3d2604221699854c30dc4c99f42ca522afc56 Mon Sep 17 00:00:00 2001
From: Pete Nelson <pnelson@terremark.com>
Date: Thu, 27 Jun 2013 16:51:07 -0400
Subject: [PATCH] buse.c: add assertions to avoid null function ptrs

---
 buse.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/buse.c b/buse.c
index 508fea3..dd9ea64 100644
--- a/buse.c
+++ b/buse.c
@@ -136,6 +136,7 @@ int buse_main(const char* dev_file, const struct buse_operations *aop, void *use
        */
     case NBD_CMD_READ:
       fprintf(stderr, "Request for read of size %d\n", len);
+      assert(aop->read);
       chunk = malloc(len);
       reply.error = aop->read(chunk, len, from, userdata);
       write_all(sk, (char*)&reply, sizeof(struct nbd_reply));
@@ -145,6 +146,7 @@ int buse_main(const char* dev_file, const struct buse_operations *aop, void *use
       break;
     case NBD_CMD_WRITE:
       fprintf(stderr, "Request for write of size %d\n", len);
+      assert(aop->write);
       chunk = malloc(len);
       read_all(sk, chunk, len);
       reply.error = aop->write(chunk, len, from, userdata);
@@ -153,16 +155,19 @@ int buse_main(const char* dev_file, const struct buse_operations *aop, void *use
       break;
     case NBD_CMD_DISC:
       /* Handle a disconnect request. */
+      assert(aop->disc);
       aop->disc(userdata);
       return 0;
 #if defined NBD_CMD_FLUSH
     case NBD_CMD_FLUSH:
+      assert(aop->flush);
       reply.error = aop->flush(userdata);
       write_all(sk, (char*)&reply, sizeof(struct nbd_reply));
       break;
 #endif
 #if defined NBD_CMD_TRIM
     case NBD_CMD_TRIM:
+      assert(aop->trim);
       reply.error = aop->trim(from, len, userdata);
       write_all(sk, (char*)&reply, sizeof(struct nbd_reply));
       break;