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Diffstat (limited to 'fs/xfs/libxfs/xfs_dir2_node.c')
-rw-r--r--fs/xfs/libxfs/xfs_dir2_node.c51
1 files changed, 49 insertions, 2 deletions
diff --git a/fs/xfs/libxfs/xfs_dir2_node.c b/fs/xfs/libxfs/xfs_dir2_node.c
index 75a557432d0f..bbd1238852b3 100644
--- a/fs/xfs/libxfs/xfs_dir2_node.c
+++ b/fs/xfs/libxfs/xfs_dir2_node.c
@@ -155,6 +155,42 @@ const struct xfs_buf_ops xfs_dir3_free_buf_ops = {
.verify_write = xfs_dir3_free_write_verify,
};
+/* Everything ok in the free block header? */
+static bool
+xfs_dir3_free_header_check(
+ struct xfs_inode *dp,
+ xfs_dablk_t fbno,
+ struct xfs_buf *bp)
+{
+ struct xfs_mount *mp = dp->i_mount;
+ unsigned int firstdb;
+ int maxbests;
+
+ maxbests = dp->d_ops->free_max_bests(mp->m_dir_geo);
+ firstdb = (xfs_dir2_da_to_db(mp->m_dir_geo, fbno) -
+ xfs_dir2_byte_to_db(mp->m_dir_geo, XFS_DIR2_FREE_OFFSET)) *
+ maxbests;
+ if (xfs_sb_version_hascrc(&mp->m_sb)) {
+ struct xfs_dir3_free_hdr *hdr3 = bp->b_addr;
+
+ if (be32_to_cpu(hdr3->firstdb) != firstdb)
+ return false;
+ if (be32_to_cpu(hdr3->nvalid) > maxbests)
+ return false;
+ if (be32_to_cpu(hdr3->nvalid) < be32_to_cpu(hdr3->nused))
+ return false;
+ } else {
+ struct xfs_dir2_free_hdr *hdr = bp->b_addr;
+
+ if (be32_to_cpu(hdr->firstdb) != firstdb)
+ return false;
+ if (be32_to_cpu(hdr->nvalid) > maxbests)
+ return false;
+ if (be32_to_cpu(hdr->nvalid) < be32_to_cpu(hdr->nused))
+ return false;
+ }
+ return true;
+}
static int
__xfs_dir3_free_read(
@@ -168,11 +204,22 @@ __xfs_dir3_free_read(
err = xfs_da_read_buf(tp, dp, fbno, mappedbno, bpp,
XFS_DATA_FORK, &xfs_dir3_free_buf_ops);
+ if (err || !*bpp)
+ return err;
+
+ /* Check things that we can't do in the verifier. */
+ if (!xfs_dir3_free_header_check(dp, fbno, *bpp)) {
+ xfs_buf_ioerror(*bpp, -EFSCORRUPTED);
+ xfs_verifier_error(*bpp);
+ xfs_trans_brelse(tp, *bpp);
+ return -EFSCORRUPTED;
+ }
/* try read returns without an error or *bpp if it lands in a hole */
- if (!err && tp && *bpp)
+ if (tp)
xfs_trans_buf_set_type(tp, *bpp, XFS_BLFT_DIR_FREE_BUF);
- return err;
+
+ return 0;
}
int