[PATCH 06/11] xfsprogs: xfs_db: check null derefernce after block_to_bt

[Vivek Trivedi]

add assert if block_to_bt returns NULL to avoid null pointer
dereference and get backtrace.
Reported by coverity.

Signed-off-by: Vivek Trivedi <t.vivek at samsung.com>
---
 db/btblock.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/db/btblock.c b/db/btblock.c
index 46140fc..91593f8 100644
--- a/db/btblock.c
+++ b/db/btblock.c
@@ -180,6 +180,7 @@ btblock_key_offset(
 	struct xfs_db_btree	*bt = block_to_bt(block);
 	int			offset;
 
+	ASSERT(bt != NULL);
 	ASSERT(startoff == 0);
 	ASSERT(block->bb_level != 0);
 
@@ -201,6 +202,7 @@ btblock_ptr_offset(
 	int			offset;
 	int			maxrecs;
 
+	ASSERT(bt != NULL);
 	ASSERT(startoff == 0);
 	ASSERT(block->bb_level != 0);
 
@@ -225,6 +227,7 @@ btblock_rec_offset(
 	struct xfs_db_btree	*bt = block_to_bt(block);
 	int			offset;
 
+	ASSERT(bt != NULL);
 	ASSERT(startoff == 0);
 	ASSERT(block->bb_level == 0);
 
-- 
1.7.9.5