In the Linux kernel, the following vulnerability has been resolved:

ocfs2: validate group add input before caching

[BUG]
OCFS2_IOC_GROUP_ADD can trigger a BUG_ON in
ocfs2_set_new_buffer_uptodate():

kernel BUG at fs/ocfs2/uptodate.c:509!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
RIP: 0010:ocfs2_set_new_buffer_uptodate+0x194/0x1e0 fs/ocfs2/uptodate.c:509
Code: ffffe88f 42b9fe4c 89e64889 dfe8b4df
Call Trace:
 ocfs2_group_add+0x3f1/0x1510 fs/ocfs2/resize.c:507
 ocfs2_ioctl+0x309/0x6e0 fs/ocfs2/ioctl.c:887
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __x64_sys_ioctl+0x197/0x1e0 fs/ioctl.c:583
 x64_sys_call+0x1144/0x26a0 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x93/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7bbfb55a966d

[CAUSE]
ocfs2_group_add() calls ocfs2_set_new_buffer_uptodate() on a
user-controlled group block before ocfs2_verify_group_and_input()
validates that block number. That helper is only valid for newly
allocated metadata and asserts that the block is not already present in
the chosen metadata cache. The code also uses INODE_CACHE(inode) even
though the group descriptor belongs to main_bm_inode and later journal
accesses use that cache context instead.

[FIX]
Validate the on-disk group descriptor before caching it, then add it to
the metadata cache tracked by INODE_CACHE(main_bm_inode). Keep the
validation failure path separate from the later cleanup path so we only
remove the buffer from that cache after it has actually been inserted.
This keeps the group buffer lifetime consistent across validation,
journaling, and cleanup.

https://git.kernel.org/stable/c/22544ddedf381ed5191cfc783aea8d6c936bc201

https://git.kernel.org/stable/c/6c5e70409c1961fe1278968f038eaaed6cc1145a

https://git.kernel.org/stable/c/70b672833f4025341c11b22c7f83778a5cd611bc

https://git.kernel.org/stable/c/76bd722db0a92b84ccd99e03796a0b6f1ae71c31

https://git.kernel.org/stable/c/aed87e866d1a321edb9703563c2faa8fec89835d

https://git.kernel.org/stable/c/b9ae3942deec4c9e3fa2070521f90910f7490011

https://git.kernel.org/stable/c/e7c2cb552e6eb85c0f5aefdd7f0f7c3c8591a6a3

https://git.kernel.org/stable/c/f7e139d7563f6947ad509fb468903941d0bb7ddd

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