From c3856bb499eae0cd5773b609ee9aa8a0e6e42b6c Mon Sep 17 00:00:00 2001 From: Lizhi Xu Date: Thu, 9 Oct 2025 10:37:33 +0800 Subject: [PATCH] ntfs3: avoid memcpy size warning There are more entries after the structure, use unsafe_memcpy() to avoid this warning. syzbot reported: memcpy: detected field-spanning write (size 3656) of single field "hdr1" at fs/ntfs3/index.c:1927 (size 16) Call Trace: indx_insert_entry+0x1a0/0x460 fs/ntfs3/index.c:1996 ni_add_name+0x4dd/0x820 fs/ntfs3/frecord.c:2995 ni_rename+0x98/0x170 fs/ntfs3/frecord.c:3026 ntfs_rename+0xab9/0xf00 fs/ntfs3/namei.c:332 Reported-by: syzbot+3a1878433bc1cb97b42a@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=3a1878433bc1cb97b42a Signed-off-by: Lizhi Xu Signed-off-by: Konstantin Komarov --- fs/ntfs3/index.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/ntfs3/index.c b/fs/ntfs3/index.c index 6d1bf890929d9..7157cfd70fdcb 100644 --- a/fs/ntfs3/index.c +++ b/fs/ntfs3/index.c @@ -1924,7 +1924,8 @@ indx_insert_into_buffer(struct ntfs_index *indx, struct ntfs_inode *ni, * Undo critical operations. */ indx_mark_free(indx, ni, new_vbn >> indx->idx2vbn_bits); - memcpy(hdr1, hdr1_saved, used1); + unsafe_memcpy(hdr1, hdr1_saved, used1, + "There are entries after the structure"); indx_write(indx, ni, n1, 0); } -- 2.47.3