[PATCH net] cxgb4: Fix stack out-of-bounds read due to wrong size to t4_record_mbox()

[Stefano Brivio]

Passing commands for logging to t4_record_mbox() with size
MBOX_LEN, when the actual command size is actually smaller,
causes out-of-bounds stack accesses in t4_record_mbox() while
copying command words here:

        for (i = 0; i < size / 8; i++)
                entry->cmd[i] = be64_to_cpu(cmd[i]);

Up to 48 bytes from the stack are then leaked to debugfs.

This happens whenever we send (and log) commands described by
structs fw_sched_cmd (32 bytes leaked), fw_vi_rxmode_cmd (48),
fw_hello_cmd (48), fw_bye_cmd (48), fw_initialize_cmd (48),
fw_reset_cmd (48), fw_pfvf_cmd (32), fw_eq_eth_cmd (16),
fw_eq_ctrl_cmd (32), fw_eq_ofld_cmd (32), fw_acl_mac_cmd(16),
fw_rss_glb_config_cmd(32), fw_rss_vi_config_cmd(32),
fw_devlog_cmd(32), fw_vi_enable_cmd(48), fw_port_cmd(32),
fw_sched_cmd(32), fw_devlog_cmd(32).

The cxgb4vf driver got this right instead.

When we call t4_record_mbox() to log a command reply, a MBOX_LEN
size can be used though, as get_mbox_rpl() will fill cmd_rpl up
completely.

Fixes: 7f080c3f2ff0 ("cxgb4: Add support to enable logging of firmware mailbox 
commands")
Signed-off-by: Stefano Brivio <sbri...@redhat.com>
---
I guess this should be queued up for -stable, back to 4.7.

 drivers/net/ethernet/chelsio/cxgb4/t4_hw.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c 
b/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
index 82bf7aac6cdb..0293b41171a5 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
@@ -369,12 +369,12 @@ int t4_wr_mbox_meat_timeout(struct adapter *adap, int 
mbox, const void *cmd,
                list_del(&entry.list);
                spin_unlock(&adap->mbox_lock);
                ret = (v == MBOX_OWNER_FW) ? -EBUSY : -ETIMEDOUT;
-               t4_record_mbox(adap, cmd, MBOX_LEN, access, ret);
+               t4_record_mbox(adap, cmd, size, access, ret);
                return ret;
        }
 
        /* Copy in the new mailbox command and send it on its way ... */
-       t4_record_mbox(adap, cmd, MBOX_LEN, access, 0);
+       t4_record_mbox(adap, cmd, size, access, 0);
        for (i = 0; i < size; i += 8)
                t4_write_reg64(adap, data_reg + i, be64_to_cpu(*p++));
 
@@ -426,7 +426,7 @@ int t4_wr_mbox_meat_timeout(struct adapter *adap, int mbox, 
const void *cmd,
        }
 
        ret = (pcie_fw & PCIE_FW_ERR_F) ? -ENXIO : -ETIMEDOUT;
-       t4_record_mbox(adap, cmd, MBOX_LEN, access, ret);
+       t4_record_mbox(adap, cmd, size, access, ret);
        dev_err(adap->pdev_dev, "command %#x in mailbox %d timed out\n",
                *(const u8 *)cmd, mbox);
        t4_report_fw_error(adap);
-- 
2.9.4