From: ZhengYuan Huang <gality369@gmail.com> mainline inclusion from mainline-v7.3-rc1 commit bb88131c9831075b8dc08cdd375743e5d44c7ca2 category: bugfix bugzilla: https://atomgit.com/src-openeuler/kernel/issues/19263 CVE: CVE-2026-90204 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... -------------------------------- [BUG] A corrupted append-DIO dinode (high byte at offset 0xa1 corrupted from 0 to 1) can carry an i_dio_orphaned_slot outside the mounted filesystem slot range and trigger a use-after-free error: BUG: KASAN: slab-use-after-free in ocfs2_get_system_file_inode+0x780/0x820 fs/ocfs2/sysfile.c:102 Read of size 8 at addr ffff88800b767c00 by task kworker/u8:3/85 Call Trace: ... ocfs2_get_system_file_inode+0x780/0x820 fs/ocfs2/sysfile.c:102 ocfs2_wipe_inode+0x292/0xf70 fs/ocfs2/inode.c:840 ocfs2_delete_inode fs/ocfs2/inode.c:1155 [inline] ocfs2_evict_inode+0x6c9/0x1170 fs/ocfs2/inode.c:1295 evict+0x38e/0x8f0 fs/inode.c:810 iput_final fs/inode.c:1914 [inline] iput fs/inode.c:1966 [inline] iput+0x55b/0x8b0 fs/inode.c:1926 ocfs2_recover_orphans+0x610/0xe40 fs/ocfs2/journal.c:2374 ocfs2_complete_recovery+0x5af/0xd00 fs/ocfs2/journal.c:1373 ... [CAUSE] ocfs2_del_inode_from_orphan() uses i_dio_orphaned_slot to index the slot-local system inode cache. The dinode validator does not check this active slot, so an out-of-range value produces an invalid cache entry pointer that is dereferenced as an inode pointer. [FIX] Reject an active i_dio_orphaned_slot outside the slot range during dinode validation, before DIO orphan recovery can consume it. Link: https://lore.kernel.org/20260803030007.3993199-3-gality369@gmail.com Fixes: 06ee5c75b575 ("ocfs2: add functions to add and remove inode in orphan dir") Signed-off-by: ZhengYuan Huang <gality369@gmail.com> Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com> Cc: Mark Fasheh <mark@fasheh.com> Cc: Joel Becker <jlbec@evilplan.org> Cc: Junxiao Bi <junxiao.bi@oracle.com> Cc: Changwei Ge <gechangwei@live.cn> Cc: Jun Piao <piaojun@huawei.com> Cc: Heming Zhao <heming.zhao@suse.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Conflicts: fs/ocfs2/inode.c [Context conflicts.] Signed-off-by: Jiacheng Yu <yujiacheng3@huawei.com> --- fs/ocfs2/inode.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c index e5fa0070016f1..897139a1f72e0 100644 --- a/fs/ocfs2/inode.c +++ b/fs/ocfs2/inode.c @@ -1418,6 +1418,14 @@ int ocfs2_validate_inode_block(struct super_block *sb, goto bail; } + if ((le32_to_cpu(di->i_flags) & OCFS2_DIO_ORPHANED_FL) && + le16_to_cpu(di->i_dio_orphaned_slot) >= OCFS2_SB(sb)->max_slots) { + rc = ocfs2_error(sb, "Invalid dinode %llu: DIO orphaned slot %u\n", + (unsigned long long)bh->b_blocknr, + le16_to_cpu(di->i_dio_orphaned_slot)); + goto bail; + } + if (S_ISLNK(le16_to_cpu(di->i_mode)) && !le32_to_cpu(di->i_clusters)) { int max_inline = ocfs2_fast_symlink_chars(sb); -- 2.34.1