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Josef Bacik 6b71f95c96 btrfs: clean up our handling of refs == 0 in snapshot delete 
[ Upstream commit b8ccef048354074a548f108e51d0557d6adfd3a3 ]

In reada we BUG_ON(refs == 0), which could be unkind since we aren't
holding a lock on the extent leaf and thus could get a transient
incorrect answer.  In walk_down_proc we also BUG_ON(refs == 0), which
could happen if we have extent tree corruption.  Change that to return
-EUCLEAN.  In do_walk_down() we catch this case and handle it correctly,
however we return -EIO, which -EUCLEAN is a more appropriate error code.
Finally in walk_up_proc we have the same BUG_ON(refs == 0), so convert
that to proper error handling.  Also adjust the error message so we can
actually do something with the information.

This fixes CVE-2024-46840.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: katrinzhou <katrinzhou@tencent.com>
Signed-off-by: Jianping Liu <frankjpliu@tencent.com>
 		2024-11-28 21:43:47 +08:00
..
tests tkernel: sync code to the same with tk4 pub/lts/0017-kabi 2024-06-12 13:13:20 +08:00
Kconfig tkernel: sync code to the same with tk4 pub/lts/0017-kabi 2024-06-12 13:13:20 +08:00
Makefile btrfs: migrate the block group lookup code 2019-09-09 14:59:04 +02:00
acl.c btrfs: cleanup btrfs_setxattr_trans and drop transaction parameter 2019-04-29 19:02:44 +02:00
async-thread.c tkernel: sync code to the same with tk4 pub/lts/0017-kabi 2024-06-12 13:13:20 +08:00
async-thread.h ock: sync codes to ock 5.4.119-20.0009.21 2024-06-11 20:27:38 +08:00
backref.c btrfs: fix information leak in btrfs_ioctl_logical_to_ino() 2024-11-28 21:43:44 +08:00
backref.h btrfs: fiemap: preallocate ulists for btrfs_check_shared 2019-07-01 13:34:53 +02:00
block-group.c tkernel: sync code to the same with tk4 pub/lts/0017-kabi 2024-06-12 13:13:20 +08:00
block-group.h ock: sync codes to ock 5.4.119-20.0009.21 2024-06-11 20:27:38 +08:00
block-rsv.c ock: sync codes to ock 5.4.119-20.0009.21 2024-06-11 20:27:38 +08:00
block-rsv.h btrfs: migrate the global_block_rsv helpers to block-rsv.c 2019-07-02 12:30:55 +02:00
btrfs_inode.h tkernel: sync code to the same with tk4 pub/lts/0017-kabi 2024-06-12 13:13:20 +08:00
check-integrity.c tkernel: add base tlinux kernel interfaces 2024-06-11 20:09:33 +08:00
check-integrity.h btrfs: replace GPL boilerplate by SPDX -- headers 2018-04-12 16:29:46 +02:00
compression.c tkernel: sync code to the same with tk4 pub/lts/0017-kabi 2024-06-12 13:13:20 +08:00
compression.h btrfs: compression: replace set_level callbacks by a common helper 2019-09-09 14:59:11 +02:00
ctree.c tkernel: sync code to the same with tk4 pub/lts/0017-kabi 2024-06-12 13:13:20 +08:00
ctree.h tkernel: sync code to the same with tk4 pub/lts/0017-kabi 2024-06-12 13:13:20 +08:00
delalloc-space.c btrfs: free exchange changeset on failures 2024-11-28 21:43:44 +08:00
delalloc-space.h btrfs: migrate the delalloc space stuff to it's own home 2019-07-04 17:26:17 +02:00
delayed-inode.c tkernel: sync code to the same with tk4 pub/lts/0017-kabi 2024-06-12 13:13:20 +08:00
delayed-inode.h Btrfs: delayed-inode: use rb_first_cached for ins_root and del_root 2018-10-15 17:23:33 +02:00
delayed-ref.c tkernel: add base tlinux kernel interfaces 2024-06-11 20:09:33 +08:00
delayed-ref.h btrfs: migrate the delayed refs rsv code 2019-07-04 17:26:17 +02:00
dev-replace.c tkernel: sync code to the same with tk4 pub/lts/0017-kabi 2024-06-12 13:13:20 +08:00
dev-replace.h btrfs: get fs_info from trans in btrfs_run_dev_replace 2019-04-29 19:02:43 +02:00
dir-item.c tkernel: sync code to the same with tk4 pub/lts/0017-kabi 2024-06-12 13:13:20 +08:00
disk-io.c btrfs: fix hang during unmount when stopping a space reclaim worker 2024-11-28 21:43:44 +08:00
disk-io.h btrfs: Make reada_tree_block_flagged private 2019-09-09 14:59:11 +02:00
export.c tkernel: sync code to the same with tk4 pub/lts/0017-kabi 2024-06-12 13:13:20 +08:00
export.h tkernel: sync code to the same with tk4 pub/lts/0017-kabi 2024-06-12 13:13:20 +08:00
extent-tree.c btrfs: clean up our handling of refs == 0 in snapshot delete 2024-11-28 21:43:47 +08:00
extent_io.c tkernel: sync code to the same with tk4 pub/lts/0017-kabi 2024-06-12 13:13:20 +08:00
extent_io.h tkernel: sync code to the same with tk4 pub/lts/0017-kabi 2024-06-12 13:13:20 +08:00
extent_map.c tkernel: add base tlinux kernel interfaces 2024-06-11 20:09:33 +08:00
extent_map.h btrfs: Remove impossible condition from mergable_maps 2019-02-25 14:13:21 +01:00
file-item.c tkernel: sync code to the same with tk4 pub/lts/0017-kabi 2024-06-12 13:13:20 +08:00
file.c tkernel: sync code to the same with tk4 pub/lts/0017-kabi 2024-06-12 13:13:20 +08:00
free-space-cache.c tkernel: sync code to the same with tk4 pub/lts/0017-kabi 2024-06-12 13:13:20 +08:00
free-space-cache.h btrfs: move struct io_ctl to free-space-cache.h 2019-09-09 14:59:15 +02:00
free-space-tree.c ock: sync codes to ock 5.4.119-20.0009.21 2024-06-11 20:27:38 +08:00
free-space-tree.h btrfs: move basic block_group definitions to their own header 2019-09-09 14:59:03 +02:00
inode-item.c btrfs: Make btrfs_find_name_in_ext_backref return struct btrfs_inode_extref 2019-09-09 14:59:16 +02:00
inode-map.c btrfs: qgroup: Always free PREALLOC META reserve in btrfs_delalloc_release_extents() 2019-10-15 18:50:07 +02:00
inode-map.h btrfs: replace GPL boilerplate by SPDX -- headers 2018-04-12 16:29:46 +02:00
inode.c tkernel: sync code to the same with tk4 pub/lts/0017-kabi 2024-06-12 13:13:20 +08:00
ioctl.c tkernel: sync code to the same with tk4 pub/lts/0017-kabi 2024-06-12 13:13:20 +08:00
locking.c btrfs: move cond_wake_up functions out of ctree 2019-09-09 14:59:15 +02:00
locking.h btrfs: Remove unused locking functions 2019-09-09 14:58:59 +02:00
lzo.c btrfs: compression: replace set_level callbacks by a common helper 2019-09-09 14:59:11 +02:00
misc.h btrfs: move math functions to misc.h 2019-09-09 14:59:15 +02:00
ordered-data.c tkernel: add base tlinux kernel interfaces 2024-06-11 20:09:33 +08:00
ordered-data.h btrfs: don't assume ordered sums to be 4 bytes 2019-07-01 13:35:00 +02:00
orphan.c btrfs: replace GPL boilerplate by SPDX -- sources 2018-04-12 16:29:51 +02:00
print-tree.c ock: sync codes to ock 5.4.119-20.0009.21 2024-06-11 20:27:38 +08:00
print-tree.h btrfs: print-tree: debugging output enhancement 2018-04-20 19:18:16 +02:00
props.c btrfs: rename the btrfs_calc_*_metadata_size helpers 2019-09-09 14:59:13 +02:00
props.h btrfs: delete unused function btrfs_set_prop_trans 2019-04-29 19:02:54 +02:00
qgroup.c tkernel: sync code to the same with tk4 pub/lts/0017-kabi 2024-06-12 13:13:20 +08:00
qgroup.h tkernel: sync code to the same with tk4 pub/lts/0017-kabi 2024-06-12 13:13:20 +08:00
raid56.c tkernel: sync code to the same with tk4 pub/lts/0017-kabi 2024-06-12 13:13:20 +08:00
raid56.h btrfs: constify map parameter for nr_parity_stripes and nr_data_stripes 2019-07-01 13:34:58 +02:00
rcu-string.h tkernel: sync code to the same with tk4 pub/lts/0017-kabi 2024-06-12 13:13:20 +08:00
reada.c ock: sync codes to ock 5.4.119-20.0009.21 2024-06-11 20:27:38 +08:00
ref-verify.c ock: sync codes to ock 5.4.119-20.0009.21 2024-06-11 20:27:38 +08:00
ref-verify.h btrfs: ref-verify: Use btrfs_ref to refactor btrfs_ref_tree_mod() 2019-04-29 19:02:49 +02:00
relocation.c ock: sync codes to ock 5.4.119-20.0009.21 2024-06-11 20:27:38 +08:00
root-tree.c tkernel: sync code to the same with tk4 pub/lts/0017-kabi 2024-06-12 13:13:20 +08:00
scrub.c tkernel: sync code to the same with tk4 pub/lts/0017-kabi 2024-06-12 13:13:20 +08:00
send.c btrfs: send: handle path ref underflow in header iterate_inode_ref() 2024-11-28 21:43:43 +08:00
send.h btrfs: replace GPL boilerplate by SPDX -- headers 2018-04-12 16:29:46 +02:00
space-info.c tkernel: sync code to the same with tk4 pub/lts/0017-kabi 2024-06-12 13:13:20 +08:00
space-info.h ock: sync codes to ock 5.4.119-20.0009.21 2024-06-11 20:27:38 +08:00
struct-funcs.c btrfs: tie extent buffer and it's token together 2019-09-09 14:59:16 +02:00
super.c tkernel: sync code to the same with tk4 pub/lts/0017-kabi 2024-06-12 13:13:20 +08:00
sysfs.c tkernel: sync code to the same with tk4 pub/lts/0017-kabi 2024-06-12 13:13:20 +08:00
sysfs.h btrfs: sysfs: move helper macros to sysfs.c 2019-09-09 14:59:08 +02:00
transaction.c tkernel: sync code to the same with tk4 pub/lts/0017-kabi 2024-06-12 13:13:20 +08:00
transaction.h tkernel: sync code to the same with tk4 pub/lts/0017-kabi 2024-06-12 13:13:20 +08:00
tree-checker.c tkernel: sync code to the same with tk4 pub/lts/0017-kabi 2024-06-12 13:13:20 +08:00
tree-checker.h btrfs: get fs_info from eb in btrfs_check_chunk_valid 2019-04-29 19:02:39 +02:00
tree-defrag.c btrfs: open code now trivial btrfs_set_lock_blocking 2019-02-25 14:13:27 +01:00
tree-log.c tkernel: sync code to the same with tk4 pub/lts/0017-kabi 2024-06-12 13:13:20 +08:00
tree-log.h tkernel: sync code to the same with tk4 pub/lts/0017-kabi 2024-06-12 13:13:20 +08:00
ulist.c btrfs: replace GPL boilerplate by SPDX -- sources 2018-04-12 16:29:51 +02:00
ulist.h btrfs: replace GPL boilerplate by SPDX -- headers 2018-04-12 16:29:46 +02:00
uuid-tree.c tkernel: add base tlinux kernel interfaces 2024-06-11 20:09:33 +08:00
volumes.c btrfs: add missing mutex_unlock in btrfs_relocate_sys_chunks() 2024-11-28 21:43:44 +08:00
volumes.h ock: sync codes to ock 5.4.119-20.0009.21 2024-06-11 20:27:38 +08:00
xattr.c tkernel: sync code to the same with tk4 pub/lts/0017-kabi 2024-06-12 13:13:20 +08:00
xattr.h btrfs: cleanup btrfs_setxattr_trans and drop transaction parameter 2019-04-29 19:02:44 +02:00
zlib.c tkernel: sync code to the same with tk4 pub/lts/0017-kabi 2024-06-12 13:13:20 +08:00
zstd.c btrfs: move cond_wake_up functions out of ctree 2019-09-09 14:59:15 +02:00