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fs/ntfs3: Fix OOB read in indx_insert_into_buffer
[ Upstream commitb8c4494904
] Syzbot reported a OOB read bug: BUG: KASAN: slab-out-of-bounds in indx_insert_into_buffer+0xaa3/0x13b0 fs/ntfs3/index.c:1755 Read of size 17168 at addr ffff8880255e06c0 by task syz-executor308/3630 Call Trace: <TASK> memmove+0x25/0x60 mm/kasan/shadow.c:54 indx_insert_into_buffer+0xaa3/0x13b0 fs/ntfs3/index.c:1755 indx_insert_entry+0x446/0x6b0 fs/ntfs3/index.c:1863 ntfs_create_inode+0x1d3f/0x35c0 fs/ntfs3/inode.c:1548 ntfs_create+0x3e/0x60 fs/ntfs3/namei.c:100 lookup_open fs/namei.c:3413 [inline] If the member struct INDEX_BUFFER *index of struct indx_node is incorrect, that is, the value of __le32 used is greater than the value of __le32 total in struct INDEX_HDR. Therefore, OOB read occurs when memmove is called in indx_insert_into_buffer(). Fix this by adding a check in hdr_find_e(). Fixes:82cae269cf
("fs/ntfs3: Add initialization of super block") Reported-by: syzbot+d882d57193079e379309@syzkaller.appspotmail.com Signed-off-by: ZhangPeng <zhangpeng362@huawei.com> Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -679,9 +679,13 @@ static struct NTFS_DE *hdr_find_e(const struct ntfs_index *indx,
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u32 e_size, e_key_len;
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u32 end = le32_to_cpu(hdr->used);
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u32 off = le32_to_cpu(hdr->de_off);
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u32 total = le32_to_cpu(hdr->total);
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u16 offs[128];
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fill_table:
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if (end > total)
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return NULL;
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if (off + sizeof(struct NTFS_DE) > end)
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return NULL;
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