commit
17d5b135bb720832364e8f55f6a887a3c7ec8fdb upstream.
If ->DataOffset of create context is 0, DataBuffer size is not correctly
validated. This patch change wrong validation code and consider tag
length in request.
Cc: stable@vger.kernel.org
Reported-by: zdi-disclosures@trendmicro.com # ZDI-CAN-21824
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
name_len < 4 ||
name_off + name_len > cc_len ||
(value_off & 0x7) != 0 ||
- (value_off && (value_off < name_off + name_len)) ||
+ (value_len && value_off < name_off + (name_len < 8 ? 8 : name_len)) ||
((u64)value_off + value_len > cc_len))
return ERR_PTR(-EINVAL);