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If function dbg_check_idx_size() failed by loading znode in mounting
process, there are two problems:
1. Allocated znodes won't be freed, which causes kmemleak in kernel:
ubifs_mount
dbg_check_idx_size
dbg_walk_index
c->zroot.znode = ubifs_load_znode
child = ubifs_load_znode // failed
// Loaded znodes won't be freed in error handling path.
2. Global variable ubifs_clean_zn_cnt is not decreased, because
ubifs_tnc_close() is not invoked in error handling path, which
triggers a warning in ubifs_exit():
WARNING: CPU: 1 PID: 1576 at fs/ubifs/super.c:2486 ubifs_exit
Modules linked in: zstd ubifs(-) ubi nandsim
CPU: 1 PID: 1576 Comm: rmmod Not tainted 6.7.0-rc6
Call Trace:
ubifs_exit+0xca/0xc70 [ubifs]
__do_sys_delete_module+0x29a/0x4a0
do_syscall_64+0x6f/0x140
Fix it by adding error handling path in dbg_check_idx_size() to release
tnc tree.
Fixes: 1e51764a3c2a ("UBIFS: add new flash file system")
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Suggested-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Richard Weinberger <richard@nod.at>
31a9d5f329