Commit 17d5b135 authored by Namjae Jeon's avatar Namjae Jeon Committed by Steve French
Browse files

ksmbd: fix wrong DataOffset validation of create context 



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: default avatarNamjae Jeon <linkinjeon@kernel.org>
Signed-off-by: default avatarSteve French <stfrench@microsoft.com>
parent bf26f1b4

fs/smb/server/oplock.c

+1 −1
Original line number Diff line number Diff line
@@ -1481,7 +1481,7 @@ struct create_context *smb2_find_context_vals(void *open_req, const char *tag, i 
		    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);