[PATCH v2] libxfs: don't write uninitialized heap contents into new directory blocks

[Darrick J. Wong]

Clear the contents of the xfs buffer when we're initializing it to avoid
writing random heap contents (and CRC thereof) to disk.

Signed-off-by: Darrick J. Wong <darrick.wong at oracle.com>
---
 libxfs/rdwr.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/libxfs/rdwr.c b/libxfs/rdwr.c
index 7d73477..35fb366 100644
--- a/libxfs/rdwr.c
+++ b/libxfs/rdwr.c
@@ -411,6 +411,7 @@ __initbuf(xfs_buf_t *bp, struct xfs_buftarg *btp, xfs_daddr_t bno,
 			strerror(errno));
 		exit(1);
 	}
+	memset(bp->b_addr, 0, bytes);
 #ifdef XFS_BUF_TRACING
 	list_head_init(&bp->b_lock_list);
 #endif