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

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@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

diff --git a/libxfs/rdwr.c b/libxfs/rdwr.c
index 7d734776964f73775208f02e035ec3518f05c4b6..35fb3665a086580d7a0d604bca1b468bc7f29b4e 100644 (file)
--- 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