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Subject[PATCH 4.19 004/245] ath10k: fix array out-of-bounds access
Date
From: Miaoqing Pan <miaoqing@codeaurora.org>

[ Upstream commit c5329b2d5b8b4e41be14d31ee8505b4f5607bf9b ]

If firmware reports rate_max > WMI_TPC_RATE_MAX(WMI_TPC_FINAL_RATE_MAX)
or num_tx_chain > WMI_TPC_TX_N_CHAIN, it will cause array out-of-bounds
access, so print a warning and reset to avoid memory corruption.

Tested HW: QCA9984
Tested FW: 10.4-3.9.0.2-00035

Signed-off-by: Miaoqing Pan <miaoqing@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/wireless/ath/ath10k/debug.c | 2 +-
drivers/net/wireless/ath/ath10k/wmi.c | 49 ++++++++++++++++---------
2 files changed, 32 insertions(+), 19 deletions(-)

diff --git a/drivers/net/wireless/ath/ath10k/debug.c b/drivers/net/wireless/ath/ath10k/debug.c
index 0baaad90b8d18..aa333110eaba6 100644
--- a/drivers/net/wireless/ath/ath10k/debug.c
+++ b/drivers/net/wireless/ath/ath10k/debug.c
@@ -1521,7 +1521,7 @@ static void ath10k_tpc_stats_print(struct ath10k_tpc_stats *tpc_stats,
*len += scnprintf(buf + *len, buf_len - *len,
"No. Preamble Rate_code ");

- for (i = 0; i < WMI_TPC_TX_N_CHAIN; i++)
+ for (i = 0; i < tpc_stats->num_tx_chain; i++)
*len += scnprintf(buf + *len, buf_len - *len,
"tpc_value%d ", i);

diff --git a/drivers/net/wireless/ath/ath10k/wmi.c b/drivers/net/wireless/ath/ath10k/wmi.c
index 3372dfa0deccf..3f3fbee631c34 100644
--- a/drivers/net/wireless/ath/ath10k/wmi.c
+++ b/drivers/net/wireless/ath/ath10k/wmi.c
@@ -4550,16 +4550,13 @@ static void ath10k_tpc_config_disp_tables(struct ath10k *ar,
}

pream_idx = 0;
- for (i = 0; i < __le32_to_cpu(ev->rate_max); i++) {
+ for (i = 0; i < tpc_stats->rate_max; i++) {
memset(tpc_value, 0, sizeof(tpc_value));
memset(buff, 0, sizeof(buff));
if (i == pream_table[pream_idx])
pream_idx++;

- for (j = 0; j < WMI_TPC_TX_N_CHAIN; j++) {
- if (j >= __le32_to_cpu(ev->num_tx_chain))
- break;
-
+ for (j = 0; j < tpc_stats->num_tx_chain; j++) {
tpc[j] = ath10k_tpc_config_get_rate(ar, ev, i, j + 1,
rate_code[i],
type);
@@ -4672,7 +4669,7 @@ void ath10k_wmi_tpc_config_get_rate_code(u8 *rate_code, u16 *pream_table,

void ath10k_wmi_event_pdev_tpc_config(struct ath10k *ar, struct sk_buff *skb)
{
- u32 num_tx_chain;
+ u32 num_tx_chain, rate_max;
u8 rate_code[WMI_TPC_RATE_MAX];
u16 pream_table[WMI_TPC_PREAM_TABLE_MAX];
struct wmi_pdev_tpc_config_event *ev;
@@ -4688,6 +4685,13 @@ void ath10k_wmi_event_pdev_tpc_config(struct ath10k *ar, struct sk_buff *skb)
return;
}

+ rate_max = __le32_to_cpu(ev->rate_max);
+ if (rate_max > WMI_TPC_RATE_MAX) {
+ ath10k_warn(ar, "number of rate is %d greater than TPC configured rate %d\n",
+ rate_max, WMI_TPC_RATE_MAX);
+ rate_max = WMI_TPC_RATE_MAX;
+ }
+
tpc_stats = kzalloc(sizeof(*tpc_stats), GFP_ATOMIC);
if (!tpc_stats)
return;
@@ -4704,8 +4708,8 @@ void ath10k_wmi_event_pdev_tpc_config(struct ath10k *ar, struct sk_buff *skb)
__le32_to_cpu(ev->twice_antenna_reduction);
tpc_stats->power_limit = __le32_to_cpu(ev->power_limit);
tpc_stats->twice_max_rd_power = __le32_to_cpu(ev->twice_max_rd_power);
- tpc_stats->num_tx_chain = __le32_to_cpu(ev->num_tx_chain);
- tpc_stats->rate_max = __le32_to_cpu(ev->rate_max);
+ tpc_stats->num_tx_chain = num_tx_chain;
+ tpc_stats->rate_max = rate_max;

ath10k_tpc_config_disp_tables(ar, ev, tpc_stats,
rate_code, pream_table,
@@ -4900,16 +4904,13 @@ ath10k_wmi_tpc_stats_final_disp_tables(struct ath10k *ar,
}

pream_idx = 0;
- for (i = 0; i < __le32_to_cpu(ev->rate_max); i++) {
+ for (i = 0; i < tpc_stats->rate_max; i++) {
memset(tpc_value, 0, sizeof(tpc_value));
memset(buff, 0, sizeof(buff));
if (i == pream_table[pream_idx])
pream_idx++;

- for (j = 0; j < WMI_TPC_TX_N_CHAIN; j++) {
- if (j >= __le32_to_cpu(ev->num_tx_chain))
- break;
-
+ for (j = 0; j < tpc_stats->num_tx_chain; j++) {
tpc[j] = ath10k_wmi_tpc_final_get_rate(ar, ev, i, j + 1,
rate_code[i],
type, pream_idx);
@@ -4925,7 +4926,7 @@ ath10k_wmi_tpc_stats_final_disp_tables(struct ath10k *ar,

void ath10k_wmi_event_tpc_final_table(struct ath10k *ar, struct sk_buff *skb)
{
- u32 num_tx_chain;
+ u32 num_tx_chain, rate_max;
u8 rate_code[WMI_TPC_FINAL_RATE_MAX];
u16 pream_table[WMI_TPC_PREAM_TABLE_MAX];
struct wmi_pdev_tpc_final_table_event *ev;
@@ -4933,12 +4934,24 @@ void ath10k_wmi_event_tpc_final_table(struct ath10k *ar, struct sk_buff *skb)

ev = (struct wmi_pdev_tpc_final_table_event *)skb->data;

+ num_tx_chain = __le32_to_cpu(ev->num_tx_chain);
+ if (num_tx_chain > WMI_TPC_TX_N_CHAIN) {
+ ath10k_warn(ar, "number of tx chain is %d greater than TPC final configured tx chain %d\n",
+ num_tx_chain, WMI_TPC_TX_N_CHAIN);
+ return;
+ }
+
+ rate_max = __le32_to_cpu(ev->rate_max);
+ if (rate_max > WMI_TPC_FINAL_RATE_MAX) {
+ ath10k_warn(ar, "number of rate is %d greater than TPC final configured rate %d\n",
+ rate_max, WMI_TPC_FINAL_RATE_MAX);
+ rate_max = WMI_TPC_FINAL_RATE_MAX;
+ }
+
tpc_stats = kzalloc(sizeof(*tpc_stats), GFP_ATOMIC);
if (!tpc_stats)
return;

- num_tx_chain = __le32_to_cpu(ev->num_tx_chain);
-
ath10k_wmi_tpc_config_get_rate_code(rate_code, pream_table,
num_tx_chain);

@@ -4951,8 +4964,8 @@ void ath10k_wmi_event_tpc_final_table(struct ath10k *ar, struct sk_buff *skb)
__le32_to_cpu(ev->twice_antenna_reduction);
tpc_stats->power_limit = __le32_to_cpu(ev->power_limit);
tpc_stats->twice_max_rd_power = __le32_to_cpu(ev->twice_max_rd_power);
- tpc_stats->num_tx_chain = __le32_to_cpu(ev->num_tx_chain);
- tpc_stats->rate_max = __le32_to_cpu(ev->rate_max);
+ tpc_stats->num_tx_chain = num_tx_chain;
+ tpc_stats->rate_max = rate_max;

ath10k_wmi_tpc_stats_final_disp_tables(ar, ev, tpc_stats,
rate_code, pream_table,
--
2.25.1


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