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cd87d86792
linux/fs/xfs
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Darrick J. Wong cd87d86792 xfs: don't crash on unexpected holes in dir/attr btrees 
In quite a few places we call xfs_da_read_buf with a mappedbno that we
don't control, then assume that the function passes back either an error
code or a buffer pointer.  Unfortunately, if mappedbno == -2 and bno
maps to a hole, we get a return code of zero and a NULL buffer, which
means that we crash if we actually try to use that buffer pointer.  This
happens immediately when we set the buffer type for transaction context.

Therefore, check that we have no error code and a non-NULL bp before
trying to use bp.  This patch is a follow-up to an incomplete fix in
96a3aefb8f ("xfs: don't crash if reading a directory results in an
unexpected hole").

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2017-07-07 18:55:17 -07:00
..
libxfs xfs: don't crash on unexpected holes in dir/attr btrees 2017-07-07 18:55:17 -07:00
Kconfig xfs: define fatal assert build time tunable 2017-06-19 08:59:10 -07:00
kmem.c mm, vmalloc: use __GFP_HIGHMEM implicitly 2017-05-08 17:15:13 -07:00
kmem.h mm: introduce memalloc_nofs_{save,restore} API 2017-05-03 15:52:09 -07:00
Makefile xfs: implement the GETFSMAP ioctl 2017-04-03 15:18:17 -07:00
mrlock.h
uuid.c
uuid.h
xfs_acl.c xfs: Don't clear SGID when inheriting ACLs 2017-06-27 18:23:21 -07:00
xfs_acl.h xfs: Don't clear SGID when inheriting ACLs 2017-06-27 18:23:21 -07:00
xfs_aops.c xfs: don't allow bmap on rt files 2017-06-20 10:45:22 -07:00
xfs_aops.h xfs: use iomap_dio_rw 2016-11-30 14:37:15 +11:00
xfs_attr_inactive.c xfs: make several functions static 2016-06-01 17:38:15 +10:00
xfs_attr_list.c xfs: pass along transaction context when reading xattr block buffers 2017-06-20 10:45:22 -07:00
xfs_attr.h xfs: pass along transaction context when reading xattr block buffers 2017-06-20 10:45:22 -07:00
xfs_bmap_item.c xfs: try to avoid blowing out the transaction reservation when bunmaping a shared extent 2017-06-19 08:59:10 -07:00
xfs_bmap_item.h xfs: log bmap intent items 2016-10-04 11:05:44 -07:00
xfs_bmap_util.c xfs: refactor the ifork block counting function 2017-06-20 10:45:21 -07:00
xfs_bmap_util.h xfs: refactor the ifork block counting function 2017-06-20 10:45:21 -07:00
xfs_buf_item.c xfs: remove bli from AIL before release on transaction abort 2017-06-19 08:59:10 -07:00
xfs_buf_item.h
xfs_buf.c xfs: remove double-underscore integer types 2017-06-19 14:11:33 -07:00
xfs_buf.h xfs: push buffer of flush locked dquot to avoid quotacheck deadlock 2017-06-19 08:59:10 -07:00
xfs_dir2_readdir.c xfs: pass along transaction context when reading directory block buffers 2017-06-20 10:45:22 -07:00
xfs_discard.c xfs: remove double-underscore integer types 2017-06-19 14:11:33 -07:00
xfs_discard.h xfs: don't block the log commit handler for discards 2017-02-09 11:36:40 -08:00
xfs_dquot_item.c xfs: allocate log vector buffers outside CIL context lock 2016-07-22 09:52:35 +10:00
xfs_dquot_item.h
xfs_dquot.c xfs: fix contiguous dquot chunk iteration livelock 2017-07-05 12:07:52 -07:00
xfs_dquot.h
xfs_error.c xfs: Check for m_errortag initialization in xfs_errortag_test 2017-07-01 21:08:47 -07:00
xfs_error.h xfs: replace log_badcrc_factor knob with error injection tag 2017-06-27 18:23:21 -07:00
xfs_export.c xfs: abstract block export operations from nfsd layouts 2016-07-15 15:31:29 -04:00
xfs_export.h
xfs_extent_busy.c xfs: fix len comparison in xfs_extent_busy_trim 2017-02-16 17:20:12 -08:00
xfs_extent_busy.h xfs: improve handling of busy extents in the low-level allocator 2017-02-09 10:50:25 -08:00
xfs_extfree_item.c xfs: better log intent item refcount checking 2017-04-25 09:40:42 -07:00
xfs_extfree_item.h xfs: refactor redo intent item processing 2016-08-03 11:23:49 +10:00
xfs_file.c xfs: Switch to iomap for SEEK_HOLE / SEEK_DATA 2017-07-02 22:46:13 -07:00
xfs_filestream.c Merge branch 'xfs-4.9-log-recovery-fixes' into for-next 2016-10-03 09:56:28 +11:00
xfs_filestream.h
xfs_fsmap.c xfs: only return detailed fsmap info if the caller has CAP_SYS_ADMIN 2017-05-16 12:26:16 -07:00
xfs_fsmap.h xfs: implement the GETFSMAP ioctl 2017-04-03 15:18:17 -07:00
xfs_fsops.c xfs: remove double-underscore integer types 2017-06-19 14:11:33 -07:00
xfs_fsops.h xfs: remove double-underscore integer types 2017-06-19 14:11:33 -07:00
xfs_globals.c xfs: define fatal assert build time tunable 2017-06-19 08:59:10 -07:00
xfs_icache.c xfs: check if an inode is cached and allocated 2017-06-19 14:11:34 -07:00
xfs_icache.h xfs: check if an inode is cached and allocated 2017-06-19 14:11:34 -07:00
xfs_icreate_item.c fs: xfs: xfs_icreate_item: constify xfs_item_ops structure 2016-11-28 14:57:42 +11:00
xfs_icreate_item.h
xfs_inode_item.c xfs: remove xfs_trans_ail_delete_bulk 2017-04-25 09:40:42 -07:00
xfs_inode_item.h
xfs_inode.c xfs: remove unneeded parameter from XFS_TEST_ERROR 2017-06-27 18:23:20 -07:00
xfs_inode.h xfs: Switch to iomap for SEEK_HOLE / SEEK_DATA 2017-07-02 22:46:13 -07:00
xfs_ioctl32.c xfs: implement the GETFSMAP ioctl 2017-04-03 15:18:17 -07:00
xfs_ioctl32.h xfs: remove double-underscore integer types 2017-06-19 14:11:33 -07:00
xfs_ioctl.c xfs: make errortag a per-mountpoint structure 2017-06-27 18:23:19 -07:00
xfs_ioctl.h xfs: remove double-underscore integer types 2017-06-19 14:11:33 -07:00
xfs_iomap.c xfs: convert drop_writes to use the errortag mechanism 2017-06-27 18:23:20 -07:00
xfs_iomap.h xfs: introduce xfs_aligned_fsb_count 2017-02-06 17:47:46 -08:00
xfs_iops.c xfs: rename MAXPATHLEN to XFS_SYMLINK_MAXLEN 2017-07-07 08:37:26 -07:00
xfs_iops.h xfs: Propagate dentry down to inode_change_ok() 2016-09-22 10:56:19 +02:00
xfs_itable.c xfs: export various function for the online scrubber 2017-06-19 14:11:34 -07:00
xfs_itable.h xfs: export various function for the online scrubber 2017-06-19 14:11:34 -07:00
xfs_linux.h xfs: rename MAXPATHLEN to XFS_SYMLINK_MAXLEN 2017-07-07 08:37:26 -07:00
xfs_log_cil.c xfs: remove lsn relevant fields from xfs_trans structure and its users 2017-06-19 08:59:10 -07:00
xfs_log_priv.h xfs: remove double-underscore integer types 2017-06-19 14:11:33 -07:00
xfs_log_recover.c xfs: free uncommitted transactions during log recovery 2017-06-24 10:11:41 -07:00
xfs_log.c xfs: fix semicolon.cocci warnings 2017-06-27 18:23:21 -07:00
xfs_log.h xfs: remove double-underscore integer types 2017-06-19 14:11:33 -07:00
xfs_message.c xfs: define bug_on_assert debug mode sysfs tunable 2017-06-19 08:59:10 -07:00
xfs_message.h
xfs_mount.c xfs: make errortag a per-mountpoint structure 2017-06-27 18:23:19 -07:00
xfs_mount.h xfs: convert drop_writes to use the errortag mechanism 2017-06-27 18:23:20 -07:00
xfs_mru_cache.c
xfs_mru_cache.h
xfs_ondisk.h xfs: define the on-disk refcount btree format 2016-10-03 09:11:18 -07:00
xfs_pnfs.c xfs: remove i_iolock and use i_rwsem in the VFS inode instead 2016-11-30 14:33:25 +11:00
xfs_pnfs.h xfs: remove i_iolock and use i_rwsem in the VFS inode instead 2016-11-30 14:33:25 +11:00
xfs_qm_bhv.c xfs: remove double-underscore integer types 2017-06-19 14:11:33 -07:00
xfs_qm_syscalls.c xfs: wait on new inodes during quotaoff dquot release 2017-04-28 08:11:08 -07:00
xfs_qm.c xfs: push buffer of flush locked dquot to avoid quotacheck deadlock 2017-06-19 08:59:10 -07:00
xfs_qm.h
xfs_quota.h
xfs_quotaops.c xfs: remove a whitespace-only line from xfs_fs_get_nextdqblk 2017-07-01 21:09:33 -07:00
xfs_refcount_item.c xfs: better log intent item refcount checking 2017-04-25 09:40:42 -07:00
xfs_refcount_item.h xfs: log refcount intent items 2016-10-03 09:11:21 -07:00
xfs_reflink.c xfs: separate function to check if inode shares extents 2017-06-19 14:11:35 -07:00
xfs_reflink.h xfs: separate function to check if inode shares extents 2017-06-19 14:11:35 -07:00
xfs_rmap_item.c xfs: better log intent item refcount checking 2017-04-25 09:40:42 -07:00
xfs_rmap_item.h xfs: convert RUI log formats to use variable length arrays 2016-09-19 10:24:27 +10:00
xfs_rtalloc.c xfs: remove double-underscore integer types 2017-06-19 14:11:33 -07:00
xfs_rtalloc.h xfs: export various function for the online scrubber 2017-06-19 14:11:34 -07:00
xfs_stats.c xfs: remove double-underscore integer types 2017-06-19 14:11:33 -07:00
xfs_stats.h xfs: remove double-underscore integer types 2017-06-19 14:11:33 -07:00
xfs_super.c xfs: remove double-underscore integer types 2017-06-19 14:11:33 -07:00
xfs_super.h xfs: don't block the log commit handler for discards 2017-02-09 11:36:40 -08:00
xfs_symlink.c xfs: rename MAXPATHLEN to XFS_SYMLINK_MAXLEN 2017-07-07 08:37:26 -07:00
xfs_symlink.h xfs: allow reading of already-locked remote symbolic link 2017-06-20 10:45:22 -07:00
xfs_sysctl.c xfs: garbage collect old cowextsz reservations 2016-10-05 16:26:28 -07:00
xfs_sysctl.h xfs: define bug_on_assert debug mode sysfs tunable 2017-06-19 08:59:10 -07:00
xfs_sysfs.c xfs: replace log_badcrc_factor knob with error injection tag 2017-06-27 18:23:21 -07:00
xfs_sysfs.h xfs: configurable error behavior via sysfs 2016-05-18 10:58:51 +10:00
xfs_trace.c xfs: implement the GETFSMAP ioctl 2017-04-03 15:18:17 -07:00
xfs_trace.h xfs: remove double-underscore integer types 2017-06-19 14:11:33 -07:00
xfs_trans_ail.c xfs: remove xfs_trans_ail_delete_bulk 2017-04-25 09:40:42 -07:00
xfs_trans_bmap.c xfs: try to avoid blowing out the transaction reservation when bunmaping a shared extent 2017-06-19 08:59:10 -07:00
xfs_trans_buf.c xfs: release bli from transaction properly on fs shutdown 2017-06-19 08:59:10 -07:00
xfs_trans_dquot.c
xfs_trans_extfree.c xfs: set up per-AG free space reservations 2016-09-19 10:30:52 +10:00
xfs_trans_inode.c fs: Replace current_fs_time() with current_time() 2016-09-27 21:06:22 -04:00
xfs_trans_priv.h xfs: remove xfs_trans_ail_delete_bulk 2017-04-25 09:40:42 -07:00
xfs_trans_refcount.c xfs: connect refcount adjust functions to upper layers 2016-10-03 09:11:22 -07:00
xfs_trans_rmap.c xfs: remove double-underscore integer types 2017-06-19 14:11:33 -07:00
xfs_trans.c Changes for 4.12: 2017-05-06 11:46:16 -07:00
xfs_trans.h xfs: remove double-underscore integer types 2017-06-19 14:11:33 -07:00
xfs_xattr.c xfs: several xattr functions can be void 2016-12-05 12:32:14 +11:00
xfs.h xfs: define fatal assert build time tunable 2017-06-19 08:59:10 -07:00