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authorDarrick J. Wong <darrick.wong@oracle.com>2019-02-07 19:37:14 +0100
committerDarrick J. Wong <darrick.wong@oracle.com>2019-02-12 01:07:01 +0100
commit86bfd3750fb3070932ae2da4cb5b9ae743c13f99 (patch)
treefcd557e74d85c65c119e67fdb1c66bc7bb5664cf /fs/xfs/xfs_inode.c
parentxfs: refactor AGI unlinked bucket updates (diff)
downloadlinux-86bfd3750fb3070932ae2da4cb5b9ae743c13f99.tar.xz
linux-86bfd3750fb3070932ae2da4cb5b9ae743c13f99.zip
xfs: strengthen AGI unlinked inode bucket pointer checks
Strengthen our checking of the AGI unlinked pointers when we start to use them for updating the metadata. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Brian Foster <bfoster@redhat.com>
Diffstat (limited to '')
-rw-r--r--fs/xfs/xfs_inode.c25
1 files changed, 14 insertions, 11 deletions
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index f1de80e8b9a6..ba19cfd52b5e 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -1963,6 +1963,7 @@ xfs_iunlink(
struct xfs_dinode *dip;
struct xfs_buf *agibp;
struct xfs_buf *ibp;
+ xfs_agino_t next_agino;
xfs_agnumber_t agno = XFS_INO_TO_AGNO(mp, ip->i_ino);
xfs_agino_t agino = XFS_INO_TO_AGINO(mp, ip->i_ino);
short bucket_index = agino % XFS_AGI_UNLINKED_BUCKETS;
@@ -1978,13 +1979,16 @@ xfs_iunlink(
agi = XFS_BUF_TO_AGI(agibp);
/*
- * Get the index into the agi hash table for the
- * list this inode will go on.
+ * Get the index into the agi hash table for the list this inode will
+ * go on. Make sure the pointer isn't garbage and that this inode
+ * isn't already on the list.
*/
- ASSERT(agi->agi_unlinked[bucket_index]);
- ASSERT(be32_to_cpu(agi->agi_unlinked[bucket_index]) != agino);
+ next_agino = be32_to_cpu(agi->agi_unlinked[bucket_index]);
+ if (next_agino == agino ||
+ !xfs_verify_agino_or_null(mp, agno, next_agino))
+ return -EFSCORRUPTED;
- if (agi->agi_unlinked[bucket_index] != cpu_to_be32(NULLAGINO)) {
+ if (next_agino != NULLAGINO) {
/*
* There is already another inode in the bucket we need
* to add ourselves to. Add us at the front of the list.
@@ -2045,17 +2049,17 @@ xfs_iunlink_remove(
agi = XFS_BUF_TO_AGI(agibp);
/*
- * Get the index into the agi hash table for the
- * list this inode will go on.
+ * Get the index into the agi hash table for the list this inode will
+ * go on. Make sure the head pointer isn't garbage.
*/
- if (!xfs_verify_agino(mp, agno,
- be32_to_cpu(agi->agi_unlinked[bucket_index]))) {
+ next_agino = be32_to_cpu(agi->agi_unlinked[bucket_index]);
+ if (!xfs_verify_agino(mp, agno, next_agino)) {
XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp,
agi, sizeof(*agi));
return -EFSCORRUPTED;
}
- if (be32_to_cpu(agi->agi_unlinked[bucket_index]) == agino) {
+ if (next_agino == agino) {
/*
* We're at the head of the list. Get the inode's on-disk
* buffer to see if there is anyone after us on the list.
@@ -2097,7 +2101,6 @@ xfs_iunlink_remove(
/*
* We need to search the list for the inode being freed.
*/
- next_agino = be32_to_cpu(agi->agi_unlinked[bucket_index]);
last_ibp = NULL;
while (next_agino != agino) {
struct xfs_imap imap;