[PATCH] libxfs: don't write uninitialized heap contents into new directory blocks

[Darrick J. Wong]

When we're initializing a new directory block, zero the buffer
contents to avoid writing random heap contents (and crc thereof)
to disk.  This eliminates a few valgrind complaints in xfs_repair.

Signed-off-by: Darrick J. Wong <darrick.wong at oracle.com>
---
 libxfs/xfs_da_btree.c  |    1 +
 libxfs/xfs_dir2_data.c |    1 +
 libxfs/xfs_dir2_leaf.c |    1 +
 libxfs/xfs_dir2_node.c |    2 +-
 4 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/libxfs/xfs_da_btree.c b/libxfs/xfs_da_btree.c
index b731b54..bc73cbc 100644
--- a/libxfs/xfs_da_btree.c
+++ b/libxfs/xfs_da_btree.c
@@ -562,6 +562,7 @@ xfs_da3_root_split(
 	if (error)
 		return error;
 	node = bp->b_addr;
+	memset(bp->b_addr, 0, bp->b_bcount);
 	oldroot = blk1->bp->b_addr;
 	if (oldroot->hdr.info.magic == cpu_to_be16(XFS_DA_NODE_MAGIC) ||
 	    oldroot->hdr.info.magic == cpu_to_be16(XFS_DA3_NODE_MAGIC)) {
diff --git a/libxfs/xfs_dir2_data.c b/libxfs/xfs_dir2_data.c
index dc9df4d..79c2fc2 100644
--- a/libxfs/xfs_dir2_data.c
+++ b/libxfs/xfs_dir2_data.c
@@ -559,6 +559,7 @@ xfs_dir3_data_init(
 		XFS_DATA_FORK);
 	if (error)
 		return error;
+	memset(bp->b_addr, 0, bp->b_bcount);
 	bp->b_ops = &xfs_dir3_data_buf_ops;
 	xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DIR_DATA_BUF);
 
diff --git a/libxfs/xfs_dir2_leaf.c b/libxfs/xfs_dir2_leaf.c
index 8e0cbc9..6eb03fc 100644
--- a/libxfs/xfs_dir2_leaf.c
+++ b/libxfs/xfs_dir2_leaf.c
@@ -382,6 +382,7 @@ xfs_dir3_leaf_get_buf(
 	if (error)
 		return error;
 
+	memset(bp->b_addr, 0, bp->b_bcount);
 	xfs_dir3_leaf_init(mp, tp, bp, dp->i_ino, magic);
 	xfs_dir3_leaf_log_header(tp, bp);
 	if (magic == XFS_DIR2_LEAF1_MAGIC)
diff --git a/libxfs/xfs_dir2_node.c b/libxfs/xfs_dir2_node.c
index 3737e4e..3e2f04d 100644
--- a/libxfs/xfs_dir2_node.c
+++ b/libxfs/xfs_dir2_node.c
@@ -247,7 +247,7 @@ xfs_dir3_free_get_buf(
 	 * Initialize the new block to be empty, and remember
 	 * its first slot as our empty slot.
 	 */
-	memset(bp->b_addr, 0, sizeof(struct xfs_dir3_free_hdr));
+	memset(bp->b_addr, 0, bp->b_bcount);
 	memset(&hdr, 0, sizeof(hdr));
 
 	if (xfs_sb_version_hascrc(&mp->m_sb)) {