From c8f83d3389d1d1b318ac3bd2ae3d60c2862c90b4 Mon Sep 17 00:00:00 2001 From: Pardeep Kaur Date: Wed, 19 Aug 2026 11:02:40 +0530 Subject: [PATCH] wifi: ath12k: fix out-of-bounds access on TX stats arrays The fw_tx_status[], tx_wbm_rel_source[], and tqm_rel_reason[] arrays are indexed directly by values read from hardware without bounds checks. Values at or beyond MAX_FW_TX_STATUS, HAL_WBM_REL_SRC_MODULE_MAX, or MAX_TQM_RELEASE_REASON respectively would write past the end of the arrays causing memory corruption. Add likely() bounds checks before incrementing each counter. For tx_wbm_rel_source[] and tqm_rel_reason[], add WARN_ON_ONCE() on the out-of-bounds else branch. For fw_tx_status[], no WARN_ON_ONCE is added since the switch statement that follows already calls ath12k_warn() in its default: branch for unknown values, avoiding a double-warn. Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.6.r1-00402-QCAHKSWPL_SILICONZ-1 Fixes: c5c62287e690 ("wifi: ath12k: Add device dp stats support") Signed-off-by: Pardeep Kaur Reviewed-by: Rameshkumar Sundaram Reviewed-by: Baochen Qiang Link: https://patch.msgid.link/20260819053247.1420393-2-pardeep.kaur@oss.qualcomm.com Signed-off-by: Jeff Johnson --- drivers/net/wireless/ath/ath12k/wifi7/dp_tx.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/drivers/net/wireless/ath/ath12k/wifi7/dp_tx.c b/drivers/net/wireless/ath/ath12k/wifi7/dp_tx.c index 3f6df96de160..4ce0948d429f 100644 --- a/drivers/net/wireless/ath/ath12k/wifi7/dp_tx.c +++ b/drivers/net/wireless/ath/ath12k/wifi7/dp_tx.c @@ -589,7 +589,8 @@ ath12k_dp_tx_process_htt_tx_complete(struct ath12k_dp *dp, void *desc, wbm_status = le32_get_bits(status_desc->info0, HTT_TX_WBM_COMP_INFO0_STATUS); - dp->device_stats.fw_tx_status[wbm_status]++; + if (likely(wbm_status < MAX_FW_TX_STATUS)) + dp->device_stats.fw_tx_status[wbm_status]++; switch (wbm_status) { case HAL_WBM_REL_HTT_TX_COMP_STATUS_OK: @@ -993,11 +994,17 @@ void ath12k_wifi7_dp_tx_completion_handler(struct ath12k_dp *dp, int ring_id) /* Find the HAL_WBM_RELEASE_INFO0_REL_SRC_MODULE value */ buf_rel_source = le32_get_bits(tx_status->info0, HAL_WBM_RELEASE_INFO0_REL_SRC_MODULE); - dp->device_stats.tx_wbm_rel_source[buf_rel_source]++; + if (likely(buf_rel_source < HAL_WBM_REL_SRC_MODULE_MAX)) + dp->device_stats.tx_wbm_rel_source[buf_rel_source]++; + else + WARN_ON_ONCE(1); rel_status = le32_get_bits(tx_status->info0, HAL_WBM_COMPL_TX_INFO0_TQM_RELEASE_REASON); - dp->device_stats.tqm_rel_reason[rel_status]++; + if (likely(rel_status < MAX_TQM_RELEASE_REASON)) + dp->device_stats.tqm_rel_reason[rel_status]++; + else + WARN_ON_ONCE(1); /* Release descriptor as soon as extracting necessary info * to reduce contention