CVE-2022-50057

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> fs/ntfs3: Fix NULL deref in ntfs_update_mftmirr<br /> <br /> If ntfs_fill_super() wasn&amp;#39;t called then sbi-&gt;sb will be equal to NULL.<br /> Code should check this ptr before dereferencing. Syzbot hit this issue<br /> via passing wrong mount param as can be seen from log below<br /> <br /> Fail log:<br /> ntfs3: Unknown parameter &amp;#39;iochvrset&amp;#39;<br /> general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN<br /> KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]<br /> CPU: 1 PID: 3589 Comm: syz-executor210 Not tainted 5.18.0-rc3-syzkaller-00016-gb253435746d9 #0<br /> ...<br /> Call Trace:<br /> <br /> put_ntfs+0x1ed/0x2a0 fs/ntfs3/super.c:463<br /> ntfs_fs_free+0x6a/0xe0 fs/ntfs3/super.c:1363<br /> put_fs_context+0x119/0x7a0 fs/fs_context.c:469<br /> do_new_mount+0x2b4/0xad0 fs/namespace.c:3044<br /> do_mount fs/namespace.c:3383 [inline]<br /> __do_sys_mount fs/namespace.c:3591 [inline]