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...
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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 a12f35d15032..9f36b17feb1a 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) {