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authorMarios Makassikis <mmakassikis@freebox.fr>2022-05-04 15:40:10 +0200
committerSteve French <stfrench@microsoft.com>2022-05-09 22:23:01 -0500
commit158a66b245739e15858de42c0ba60fcf3de9b8e6 (patch)
treea6ff034adb6b5418e71b4eadfd9e854ac9763695 /fs/ksmbd/smb2pdu.c
parentd21a580dafc69aa04f46e6099616146a536b0724 (diff)
ksmbd: validate length in smb2_write()
The SMB2 Write packet contains data that is to be written to a file or to a pipe. Depending on the client, there may be padding between the header and the data field. Currently, the length is validated only in the case padding is present. Since the DataOffset field always points to the beginning of the data, there is no need to have a special case for padding. By removing this, the length is validated in both cases. Signed-off-by: Marios Makassikis <mmakassikis@freebox.fr> Acked-by: Namjae Jeon <linkinjeon@kernel.org> Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs/ksmbd/smb2pdu.c')
-rw-r--r--fs/ksmbd/smb2pdu.c49
1 files changed, 19 insertions, 30 deletions
diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index 16c803a9d996..2bdfe449b2da 100644
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -6328,23 +6328,18 @@ static noinline int smb2_write_pipe(struct ksmbd_work *work)
length = le32_to_cpu(req->Length);
id = req->VolatileFileId;
- if (le16_to_cpu(req->DataOffset) ==
- offsetof(struct smb2_write_req, Buffer)) {
- data_buf = (char *)&req->Buffer[0];
- } else {
- if ((u64)le16_to_cpu(req->DataOffset) + length >
- get_rfc1002_len(work->request_buf)) {
- pr_err("invalid write data offset %u, smb_len %u\n",
- le16_to_cpu(req->DataOffset),
- get_rfc1002_len(work->request_buf));
- err = -EINVAL;
- goto out;
- }
-
- data_buf = (char *)(((char *)&req->hdr.ProtocolId) +
- le16_to_cpu(req->DataOffset));
+ if ((u64)le16_to_cpu(req->DataOffset) + length >
+ get_rfc1002_len(work->request_buf)) {
+ pr_err("invalid write data offset %u, smb_len %u\n",
+ le16_to_cpu(req->DataOffset),
+ get_rfc1002_len(work->request_buf));
+ err = -EINVAL;
+ goto out;
}
+ data_buf = (char *)(((char *)&req->hdr.ProtocolId) +
+ le16_to_cpu(req->DataOffset));
+
rpc_resp = ksmbd_rpc_write(work->sess, id, data_buf, length);
if (rpc_resp) {
if (rpc_resp->flags == KSMBD_RPC_ENOTIMPLEMENTED) {
@@ -6489,22 +6484,16 @@ int smb2_write(struct ksmbd_work *work)
if (req->Channel != SMB2_CHANNEL_RDMA_V1 &&
req->Channel != SMB2_CHANNEL_RDMA_V1_INVALIDATE) {
- if (le16_to_cpu(req->DataOffset) ==
- offsetof(struct smb2_write_req, Buffer)) {
- data_buf = (char *)&req->Buffer[0];
- } else {
- if ((u64)le16_to_cpu(req->DataOffset) + length >
- get_rfc1002_len(work->request_buf)) {
- pr_err("invalid write data offset %u, smb_len %u\n",
- le16_to_cpu(req->DataOffset),
- get_rfc1002_len(work->request_buf));
- err = -EINVAL;
- goto out;
- }
-
- data_buf = (char *)(((char *)&req->hdr.ProtocolId) +
- le16_to_cpu(req->DataOffset));
+ if ((u64)le16_to_cpu(req->DataOffset) + length >
+ get_rfc1002_len(work->request_buf)) {
+ pr_err("invalid write data offset %u, smb_len %u\n",
+ le16_to_cpu(req->DataOffset),
+ get_rfc1002_len(work->request_buf));
+ err = -EINVAL;
+ goto out;
}
+ data_buf = (char *)(((char *)&req->hdr.ProtocolId) +
+ le16_to_cpu(req->DataOffset));
ksmbd_debug(SMB, "flags %u\n", le32_to_cpu(req->Flags));
if (le32_to_cpu(req->Flags) & SMB2_WRITEFLAG_WRITE_THROUGH)