From: Edward Adam Davis <eadavis@qq.com> mainline inclusion from mainline-v6.12-rc6 commit bc0a2f3a73fcdac651fca64df39306d1e5ebe3b0 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IB37AI CVE: CVE-2024-50218 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... -------------------------------- Syzbot reported a kernel BUG in ocfs2_truncate_inline. There are two reasons for this: first, the parameter value passed is greater than ocfs2_max_inline_data_with_xattr, second, the start and end parameters of ocfs2_truncate_inline are "unsigned int". So, we need to add a sanity check for byte_start and byte_len right before ocfs2_truncate_inline() in ocfs2_remove_inode_range(), if they are greater than ocfs2_max_inline_data_with_xattr return -EINVAL. Link: https://lkml.kernel.org/r/tencent_D48DB5122ADDAEDDD11918CFB68D93258C07@qq.co... Fixes: 1afc32b95233 ("ocfs2: Write support for inline data") Signed-off-by: Edward Adam Davis <eadavis@qq.com> Reported-by: syzbot+81092778aac03460d6b7@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=81092778aac03460d6b7 Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com> Cc: Joel Becker <jlbec@evilplan.org> Cc: Joseph Qi <joseph.qi@linux.alibaba.com> Cc: Mark Fasheh <mark@fasheh.com> Cc: Junxiao Bi <junxiao.bi@oracle.com> Cc: Changwei Ge <gechangwei@live.cn> Cc: Gang He <ghe@suse.com> Cc: Jun Piao <piaojun@huawei.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Heyuan Wang <wangheyuan2@h-partners.com> --- fs/ocfs2/file.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c index 43ce41404e72..294fc98a900e 100644 --- a/fs/ocfs2/file.c +++ b/fs/ocfs2/file.c @@ -1790,6 +1790,14 @@ int ocfs2_remove_inode_range(struct inode *inode, return 0; if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) { + int id_count = ocfs2_max_inline_data_with_xattr(inode->i_sb, di); + + if (byte_start > id_count || byte_start + byte_len > id_count) { + ret = -EINVAL; + mlog_errno(ret); + goto out; + } + ret = ocfs2_truncate_inline(inode, di_bh, byte_start, byte_start + byte_len, 0); if (ret) { -- 2.25.1