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authorRyusuke Konishi <konishi.ryusuke@gmail.com>2022-10-07 11:52:26 +0300
committerAndrew Morton <akpm@linux-foundation.org>2022-10-12 05:05:45 +0300
commitd0d51a97063db4704a5ef6bc978dddab1636a306 (patch)
treef1d4ec9dd7a1781bbef5bae300e4353088689ce5 /fs
parent21a87d88c2253350e115029f14fe2a10a7e6c856 (diff)
downloadlinux-d0d51a97063db4704a5ef6bc978dddab1636a306.tar.xz
nilfs2: fix leak of nilfs_root in case of writer thread creation failure
If nilfs_attach_log_writer() failed to create a log writer thread, it frees a data structure of the log writer without any cleanup. After commit e912a5b66837 ("nilfs2: use root object to get ifile"), this causes a leak of struct nilfs_root, which started to leak an ifile metadata inode and a kobject on that struct. In addition, if the kernel is booted with panic_on_warn, the above ifile metadata inode leak will cause the following panic when the nilfs2 kernel module is removed: kmem_cache_destroy nilfs2_inode_cache: Slab cache still has objects when called from nilfs_destroy_cachep+0x16/0x3a [nilfs2] WARNING: CPU: 8 PID: 1464 at mm/slab_common.c:494 kmem_cache_destroy+0x138/0x140 ... RIP: 0010:kmem_cache_destroy+0x138/0x140 Code: 00 20 00 00 e8 a9 55 d8 ff e9 76 ff ff ff 48 8b 53 60 48 c7 c6 20 70 65 86 48 c7 c7 d8 69 9c 86 48 8b 4c 24 28 e8 ef 71 c7 00 <0f> 0b e9 53 ff ff ff c3 48 81 ff ff 0f 00 00 77 03 31 c0 c3 53 48 ... Call Trace: <TASK> ? nilfs_palloc_freev.cold.24+0x58/0x58 [nilfs2] nilfs_destroy_cachep+0x16/0x3a [nilfs2] exit_nilfs_fs+0xa/0x1b [nilfs2] __x64_sys_delete_module+0x1d9/0x3a0 ? __sanitizer_cov_trace_pc+0x1a/0x50 ? syscall_trace_enter.isra.19+0x119/0x190 do_syscall_64+0x34/0x80 entry_SYSCALL_64_after_hwframe+0x63/0xcd ... </TASK> Kernel panic - not syncing: panic_on_warn set ... This patch fixes these issues by calling nilfs_detach_log_writer() cleanup function if spawning the log writer thread fails. Link: https://lkml.kernel.org/r/20221007085226.57667-1-konishi.ryusuke@gmail.com Fixes: e912a5b66837 ("nilfs2: use root object to get ifile") Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com> Reported-by: syzbot+7381dc4ad60658ca4c05@syzkaller.appspotmail.com Tested-by: Ryusuke Konishi <konishi.ryusuke@gmail.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/nilfs2/segment.c7
1 files changed, 3 insertions, 4 deletions
diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c
index 0afe0832c754..5276ab525f01 100644
--- a/fs/nilfs2/segment.c
+++ b/fs/nilfs2/segment.c
@@ -2786,10 +2786,9 @@ int nilfs_attach_log_writer(struct super_block *sb, struct nilfs_root *root)
inode_attach_wb(nilfs->ns_bdev->bd_inode, NULL);
err = nilfs_segctor_start_thread(nilfs->ns_writer);
- if (err) {
- kfree(nilfs->ns_writer);
- nilfs->ns_writer = NULL;
- }
+ if (unlikely(err))
+ nilfs_detach_log_writer(sb);
+
return err;
}