fs/ntfs3: Fix attr_punch_hole() null pointer derenference
mainline inclusion from mainline-v6.2-rc1 commit 6d5c9e79 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I683ER CVE: CVE-2022-4842 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6d5c9e79b726cc473d40e9cb60976dbe8e669624 -------------------------------- The bug occours due to a misuse of `attr` variable instead of `attr_b`. `attr` is being initialized as NULL, then being derenfernced as `attr->res.data_size`. This bug causes a crash of the ntfs3 driver itself, If compiled directly to the kernel, it crashes the whole system. Signed-off-by:Alon Zahavi <zahavi.alon@gmail.com> Co-developed-by:
Tal Lossos <tallossos@gmail.com> Signed-off-by:
Tal Lossos <tallossos@gmail.com> Signed-off-by:
Konstantin Komarov <almaz.alexandrovich@paragon-software.com> Signed-off-by:
Zhihao Cheng <chengzhihao1@huawei.com> Reviewed-by:
Zhang Yi <yi.zhang@huawei.com> Reviewed-by:
Xiu Jianfeng <xiujianfeng@huawei.com> Signed-off-by:
Jialin Zhang <zhangjialin11@huawei.com> (cherry picked from commit 86f3bddf)
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