xfs: Fix UBSAN null-ptr-deref in xfs_sysfs_init
[ Upstream commit 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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
parent
4591461ea9
commit
538c74a9cb
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@ -32,9 +32,11 @@ xfs_sysfs_init(
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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,
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&parent_kobj->kobject, "%s", name);
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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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