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Subject[PATCH] be2net: Fix buffer overflow in be_get_module_eeprom
Date
be_cmd_read_port_transceiver_data assumes that it is given a buffer that
is at least PAGE_DATA_LEN long, or twice that if the module supports SFF
8472. However, this is not always the case.

Fix this by passing the desired offset and length to
be_cmd_read_port_transceiver_data so that we only copy the bytes once.

Fixes: e36edd9d26cf ("be2net: add ethtool "-m" option support")
Signed-off-by: Hristo Venev <hristo@venev.name>
---
drivers/net/ethernet/emulex/benet/be_cmds.c | 10 +++---
drivers/net/ethernet/emulex/benet/be_cmds.h | 2 +-
.../net/ethernet/emulex/benet/be_ethtool.c | 31 ++++++++++++-------
3 files changed, 25 insertions(+), 18 deletions(-)

diff --git a/drivers/net/ethernet/emulex/benet/be_cmds.c b/drivers/net/ethernet/emulex/benet/be_cmds.c
index 528eb0f223b1..b4f5e57d0285 100644
--- a/drivers/net/ethernet/emulex/benet/be_cmds.c
+++ b/drivers/net/ethernet/emulex/benet/be_cmds.c
@@ -2287,7 +2287,7 @@ int be_cmd_get_beacon_state(struct be_adapter *adapter, u8 port_num, u32 *state)

/* Uses sync mcc */
int be_cmd_read_port_transceiver_data(struct be_adapter *adapter,
- u8 page_num, u8 *data)
+ u8 page_num, u32 off, u32 len, u8 *data)
{
struct be_dma_mem cmd;
struct be_mcc_wrb *wrb;
@@ -2321,10 +2321,10 @@ int be_cmd_read_port_transceiver_data(struct be_adapter *adapter,
req->port = cpu_to_le32(adapter->hba_port_num);
req->page_num = cpu_to_le32(page_num);
status = be_mcc_notify_wait(adapter);
- if (!status) {
+ if (!status && len > 0) {
struct be_cmd_resp_port_type *resp = cmd.va;

- memcpy(data, resp->page_data, PAGE_DATA_LEN);
+ memcpy(data, resp->page_data + off, len);
}
err:
mutex_unlock(&adapter->mcc_lock);
@@ -2415,7 +2415,7 @@ int be_cmd_query_cable_type(struct be_adapter *adapter)
int status;

status = be_cmd_read_port_transceiver_data(adapter, TR_PAGE_A0,
- page_data);
+ 0, PAGE_DATA_LEN, page_data);
if (!status) {
switch (adapter->phy.interface_type) {
case PHY_TYPE_QSFP:
@@ -2440,7 +2440,7 @@ int be_cmd_query_sfp_info(struct be_adapter *adapter)
int status;

status = be_cmd_read_port_transceiver_data(adapter, TR_PAGE_A0,
- page_data);
+ 0, PAGE_DATA_LEN, page_data);
if (!status) {
strlcpy(adapter->phy.vendor_name, page_data +
SFP_VENDOR_NAME_OFFSET, SFP_VENDOR_NAME_LEN - 1);
diff --git a/drivers/net/ethernet/emulex/benet/be_cmds.h b/drivers/net/ethernet/emulex/benet/be_cmds.h
index db1f3b908582..e2085c68c0ee 100644
--- a/drivers/net/ethernet/emulex/benet/be_cmds.h
+++ b/drivers/net/ethernet/emulex/benet/be_cmds.h
@@ -2427,7 +2427,7 @@ int be_cmd_set_beacon_state(struct be_adapter *adapter, u8 port_num, u8 beacon,
int be_cmd_get_beacon_state(struct be_adapter *adapter, u8 port_num,
u32 *state);
int be_cmd_read_port_transceiver_data(struct be_adapter *adapter,
- u8 page_num, u8 *data);
+ u8 page_num, u32 off, u32 len, u8 *data);
int be_cmd_query_cable_type(struct be_adapter *adapter);
int be_cmd_query_sfp_info(struct be_adapter *adapter);
int lancer_cmd_read_object(struct be_adapter *adapter, struct be_dma_mem *cmd,
diff --git a/drivers/net/ethernet/emulex/benet/be_ethtool.c b/drivers/net/ethernet/emulex/benet/be_ethtool.c
index dfa784339781..bd0df189d871 100644
--- a/drivers/net/ethernet/emulex/benet/be_ethtool.c
+++ b/drivers/net/ethernet/emulex/benet/be_ethtool.c
@@ -1344,7 +1344,7 @@ static int be_get_module_info(struct net_device *netdev,
return -EOPNOTSUPP;

status = be_cmd_read_port_transceiver_data(adapter, TR_PAGE_A0,
- page_data);
+ 0, PAGE_DATA_LEN, page_data);
if (!status) {
if (!page_data[SFP_PLUS_SFF_8472_COMP]) {
modinfo->type = ETH_MODULE_SFF_8079;
@@ -1362,25 +1362,32 @@ static int be_get_module_eeprom(struct net_device *netdev,
{
struct be_adapter *adapter = netdev_priv(netdev);
int status;
+ u32 begin, end;

if (!check_privilege(adapter, MAX_PRIVILEGES))
return -EOPNOTSUPP;

- status = be_cmd_read_port_transceiver_data(adapter, TR_PAGE_A0,
- data);
- if (status)
- goto err;
+ begin = eeprom->offset;
+ end = eeprom->offset + eeprom->len;
+
+ if (begin < PAGE_DATA_LEN) {
+ status = be_cmd_read_port_transceiver_data(adapter, TR_PAGE_A0, begin,
+ min_t(u32, end, PAGE_DATA_LEN) - begin,
+ data);
+ if (status)
+ goto err;
+
+ data += PAGE_DATA_LEN - begin;
+ begin = PAGE_DATA_LEN;
+ }

- if (eeprom->offset + eeprom->len > PAGE_DATA_LEN) {
- status = be_cmd_read_port_transceiver_data(adapter,
- TR_PAGE_A2,
- data +
- PAGE_DATA_LEN);
+ if (end > PAGE_DATA_LEN) {
+ status = be_cmd_read_port_transceiver_data(adapter, TR_PAGE_A2,
+ begin - PAGE_DATA_LEN,
+ end - begin, data);
if (status)
goto err;
}
- if (eeprom->offset)
- memcpy(data, data + eeprom->offset, eeprom->len);
err:
return be_cmd_status(status);
}
--
2.37.1
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