linux-kernel - Re: [ocfs2?] kernel BUG in ocfs2_truncate

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Message-ID: <tencent_696EDEEECD8C8067C286EC12EB4651899506@qq.com>
Date: Wed, 16 Oct 2024 11:29:48 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+81092778aac03460d6b7@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [ocfs2?] kernel BUG in ocfs2_truncate_inline

offset or offset + len greater than inline data max size, if true, it will
overflow in ocfs2_truncate_inline.

#syz test

diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index ad131a2fc58e..9327aa2f1bf4 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -1784,6 +1784,12 @@ int ocfs2_remove_inode_range(struct inode *inode,
 		return 0;
 
 	if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
+		int max_inl = ocfs2_max_inline_data_with_xattr(inode->i_sb, di);
+		if (byte_start > max_inl || byte_start + byte_len > max_inl) {
+			ret = -EFBIG;
+			mlog_errno(ret);
+			goto out;
+		}
 		ret = ocfs2_truncate_inline(inode, di_bh, byte_start,
 					    byte_start + byte_len, 0);
 		if (ret) {