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xfs: check owner of dir3 blocks 

Check the owner field of dir3 block headers.  If it's corrupt, release
the buffer and return EFSCORRUPTED.  All callers handle this properly.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong 2020-03-11 10:37:57 -07:00
parent a10c21ed5d
commit 1b2c1a63b6
1 changed files with 31 additions and 2 deletions
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33
fs/xfs/libxfs/xfs_dir2_block.c
View File

@ -114,6 +114,23 @@ const struct xfs_buf_ops xfs_dir3_block_buf_ops = {
.verify_struct = xfs_dir3_block_verify,
};
static xfs_failaddr_t
xfs_dir3_block_header_check(
struct xfs_inode *dp,
struct xfs_buf *bp)
{
struct xfs_mount *mp = dp->i_mount;
if (xfs_sb_version_hascrc(&mp->m_sb)) {
struct xfs_dir3_blk_hdr *hdr3 = bp->b_addr;
if (be64_to_cpu(hdr3->owner) != dp->i_ino)
return __this_address;
}
return NULL;
}
int
xfs_dir3_block_read(
struct xfs_trans *tp,
@ -121,12 +138,24 @@ xfs_dir3_block_read(
struct xfs_buf **bpp)
{
struct xfs_mount *mp = dp->i_mount;
xfs_failaddr_t fa;
int err;
err = xfs_da_read_buf(tp, dp, mp->m_dir_geo->datablk, 0, bpp,
XFS_DATA_FORK, &xfs_dir3_block_buf_ops);
if (!err && tp && *bpp)
xfs_trans_buf_set_type(tp, *bpp, XFS_BLFT_DIR_BLOCK_BUF);
if (err || !*bpp)
return err;
/* Check things that we can't do in the verifier. */
fa = xfs_dir3_block_header_check(dp, *bpp);
if (fa) {
__xfs_buf_mark_corrupt(*bpp, fa);
xfs_trans_brelse(tp, *bpp);
*bpp = NULL;
return -EFSCORRUPTED;
}
xfs_trans_buf_set_type(tp, *bpp, XFS_BLFT_DIR_BLOCK_BUF);
return err;
}