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| author | Darrick J. Wong <darrick.wong@oracle.com> | 2017-02-03 02:13:59 +0300 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com> | 2017-02-03 02:13:59 +0300 |
| commit | b3bf607d58520ea8c0666aeb4be60dbb724cd3a2 (patch) | |
| tree | 56e86f190cb9513c8e23d670e9637f87217b10f3 /fs/xfs | |
| parent | d5a91baeb6033c3392121e4d5c011cdc08dfa9f7 (diff) | |
| download | linux-b3bf607d58520ea8c0666aeb4be60dbb724cd3a2.tar.xz | |
xfs: check for obviously bad level values in the bmbt root
We can't handle a bmbt that's taller than BTREE_MAXLEVELS, and there's
no such thing as a zero-level bmbt (for that we have extents format),
so if we see this, send back an error code.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'fs/xfs')
| -rw-r--r-- | fs/xfs/libxfs/xfs_inode_fork.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/xfs/libxfs/xfs_inode_fork.c b/fs/xfs/libxfs/xfs_inode_fork.c index 421341f93bea..25c1e078aef6 100644 --- a/fs/xfs/libxfs/xfs_inode_fork.c +++ b/fs/xfs/libxfs/xfs_inode_fork.c @@ -26,6 +26,7 @@ #include "xfs_inode.h" #include "xfs_trans.h" #include "xfs_inode_item.h" +#include "xfs_btree.h" #include "xfs_bmap_btree.h" #include "xfs_bmap.h" #include "xfs_error.h" @@ -429,11 +430,13 @@ xfs_iformat_btree( /* REFERENCED */ int nrecs; int size; + int level; ifp = XFS_IFORK_PTR(ip, whichfork); dfp = (xfs_bmdr_block_t *)XFS_DFORK_PTR(dip, whichfork); size = XFS_BMAP_BROOT_SPACE(mp, dfp); nrecs = be16_to_cpu(dfp->bb_numrecs); + level = be16_to_cpu(dfp->bb_level); /* * blow out if -- fork has less extents than can fit in @@ -446,7 +449,8 @@ xfs_iformat_btree( XFS_IFORK_MAXEXT(ip, whichfork) || XFS_BMDR_SPACE_CALC(nrecs) > XFS_DFORK_SIZE(dip, mp, whichfork) || - XFS_IFORK_NEXTENTS(ip, whichfork) > ip->i_d.di_nblocks)) { + XFS_IFORK_NEXTENTS(ip, whichfork) > ip->i_d.di_nblocks) || + level == 0 || level > XFS_BTREE_MAXLEVELS) { xfs_warn(mp, "corrupt inode %Lu (btree).", (unsigned long long) ip->i_ino); XFS_CORRUPTION_ERROR("xfs_iformat_btree", XFS_ERRLEVEL_LOW, |