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96cf2a2c75
If xfs_sysfs_init is called with parent_kobj == NULL, UBSAN shows the following warning: UBSAN: null-ptr-deref in ./fs/xfs/xfs_sysfs.h:37:23 member access within null pointer of type 'struct xfs_kobj' Call Trace: dump_stack+0x10e/0x195 ubsan_type_mismatch_common+0x241/0x280 __ubsan_handle_type_mismatch_v1+0x32/0x40 init_xfs_fs+0x12b/0x28f do_one_initcall+0xdd/0x1d0 do_initcall_level+0x151/0x1b6 do_initcalls+0x50/0x8f do_basic_setup+0x29/0x2b kernel_init_freeable+0x19f/0x20b kernel_init+0x11/0x1e0 ret_from_fork+0x22/0x30 Fix it by checking parent_kobj before the code accesses its member. Signed-off-by: Eiichi Tsukata <devel@etsukata.com> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> [darrick: minor whitespace edits] Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
54 lines
1.2 KiB
C
54 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2014 Red Hat, Inc.
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* All Rights Reserved.
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*/
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#ifndef __XFS_SYSFS_H__
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#define __XFS_SYSFS_H__
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extern struct kobj_type xfs_mp_ktype; /* xfs_mount */
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extern struct kobj_type xfs_dbg_ktype; /* debug */
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extern struct kobj_type xfs_log_ktype; /* xlog */
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extern struct kobj_type xfs_stats_ktype; /* stats */
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static inline struct xfs_kobj *
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to_kobj(struct kobject *kobject)
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{
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return container_of(kobject, struct xfs_kobj, kobject);
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}
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static inline void
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xfs_sysfs_release(struct kobject *kobject)
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{
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struct xfs_kobj *kobj = to_kobj(kobject);
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complete(&kobj->complete);
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}
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static inline int
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xfs_sysfs_init(
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struct xfs_kobj *kobj,
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struct kobj_type *ktype,
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struct xfs_kobj *parent_kobj,
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const char *name)
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{
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struct kobject *parent;
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parent = parent_kobj ? &parent_kobj->kobject : NULL;
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init_completion(&kobj->complete);
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return kobject_init_and_add(&kobj->kobject, ktype, parent, "%s", name);
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}
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static inline void
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xfs_sysfs_del(
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struct xfs_kobj *kobj)
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{
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kobject_del(&kobj->kobject);
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kobject_put(&kobj->kobject);
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wait_for_completion(&kobj->complete);
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}
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int xfs_error_sysfs_init(struct xfs_mount *mp);
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void xfs_error_sysfs_del(struct xfs_mount *mp);
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#endif /* __XFS_SYSFS_H__ */
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