Messages in this thread | | | Subject | Re: [PATCH v3] mtd: Fix gluebi NULL pointer dereference caused by ftl notifier | From | Zhihao Cheng <> | Date | Fri, 27 Oct 2023 11:23:34 +0800 |
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在 2023/10/27 9:20, ZhaoLong Wang 写道: > If both flt.ko and gluebi.ko are loaded, the notiier of ftl > triggers NULL pointer dereference when trying to access > ‘gluebi->desc’ in gluebi_read(). > > ubi_gluebi_init > ubi_register_volume_notifier > ubi_enumerate_volumes > ubi_notify_all > gluebi_notify nb->notifier_call() > gluebi_create > mtd_device_register > mtd_device_parse_register > add_mtd_device > blktrans_notify_add not->add() > ftl_add_mtd tr->add_mtd() > scan_header > mtd_read > mtd_read_oob > mtd_read_oob_std > gluebi_read mtd->read() > gluebi->desc - NULL > > Detailed reproduction information available at the link[1], > > The solution for the gluebi module is to run jffs2 on the UBI > volume without considering working with ftl or mtdblock.[2]. > Therefore, this problem can be avoided by preventing gluebi > from creating mtdblock devices. > > Fixes: 2ba3d76a1e29 ("UBI: make gluebi a separate module") > Link: https://bugzilla.kernel.org/show_bug.cgi?id=217992 [1] > Link: https://lore.kernel.org/lkml/441107100.23734.1697904580252.JavaMail.zimbra@nod.at/ [2] > Signed-off-by: ZhaoLong Wang <wangzhaolong1@huawei.com> > --- > drivers/mtd/mtd_blkdevs.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-)
Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
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