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authorEiichi Tsukata <devel@etsukata.com>2020-08-07 01:18:48 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-08-26 11:40:58 +0300
commit538c74a9cb26b76ceccfeb9a08fcf552576ad694 (patch)
treeb4eb387daa5284b4601fc44cc8c53b5404fcb646 /fs/exec.c
parent4591461ea9f2305370c9247979893474d93dcdd2 (diff)
downloadlinux-538c74a9cb26b76ceccfeb9a08fcf552576ad694.tar.xz
xfs: Fix UBSAN null-ptr-deref in xfs_sysfs_init
[ Upstream commit 96cf2a2c75567ff56195fe3126d497a2e7e4379f ] 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>
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