[PATCH ath-next] wifi: ath12k: initialize RSSI dBm conversion event state

Rameshkumar Sundaram
2026-04-27T10:31:36Z

Currently, the RSSI dBm conversion event handler leaves struct
ath12k_wmi_rssi_dbm_conv_info_arg uninitialized on the stack before
calling the TLV parser. If one of the optional sub-TLVs is absent, the
corresponding *_present flag retains stack garbage and later gets read
in ath12k_wmi_update_rssi_offsets(). With UBSAN enabled this triggers an
invalid-load report for _Bool:

UBSAN: invalid-load in drivers/net/wireless/ath/ath12k/wmi.c:9682:15
load of value 9 is not a valid value for type '_Bool'
Call Trace:
ath12k_wmi_rssi_dbm_conversion_params_info_event.cold+0x72/0x85 [ath12k]
ath12k_wmi_op_rx+0x1871/0x2ab0 [ath12k]
ath12k_htc_rx_completion_handler+0x44b/0x810 [ath12k]
ath12k_ce_recv_process_cb+0x554/0x9f0 [ath12k]
ath12k_ce_per_engine_service+0xbe/0xf0 [ath12k]
ath12k_pci_ce_workqueue+0x69/0x120 [ath12k]

Initialize the parsed event state to zero before passing it to the TLV
parser so missing sub-TLVs correctly leave the presence flags false.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.4.1-00199-QCAHKSWPL_SILICONZ-1

Fixes: 0314ee81a91d ("wifi: ath12k: handle WMI event for real noise floor calculation")
Signed-off-by: Rameshkumar Sundaram <rameshkumar.sundaram@oss.qualcomm.com>
---
drivers/net/wireless/ath/ath12k/wmi.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath12k/wmi.c b/drivers/net/wireless/ath/ath12k/wmi.c
index 484fdd3b1b7f..1e2e1fddd081 100644
--- a/drivers/net/wireless/ath/ath12k/wmi.c
+++ b/drivers/net/wireless/ath/ath12k/wmi.c
@@ -9689,7 +9689,7 @@ static void
ath12k_wmi_rssi_dbm_conversion_params_info_event(struct ath12k_base *ab,
struct sk_buff *skb)
{
- struct ath12k_wmi_rssi_dbm_conv_info_arg rssi_info;
+ struct ath12k_wmi_rssi_dbm_conv_info_arg rssi_info = {};
struct ath12k *ar;
s32 noise_floor;
u32 pdev_id;

base-commit: 7aa24d964a04648b547197c22364e2b76aec096e
--
2.34.1