[PATCH 6.18 258/752] wifi: iwlwifi: fix 22000 series SMEM parsing

Sasha Levin
2026-02-28T17:51:44Z

From: Johannes Berg <johannes.berg@intel.com>

[ Upstream commit 58192b9ce09b0f0f86e2036683bd542130b91a98 ]

If the firmware were to report three LMACs (which doesn't
exist in hardware) then using "fwrt->smem_cfg.lmac[2]" is
an overrun of the array. Reject such and use IWL_FW_CHECK
instead of WARN_ON in this function.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20251110150012.16e8c2d70c26.Iadfcc1aedf43c5175b3f0757bea5aa232454f1ac@changeid
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/wireless/intel/iwlwifi/fw/smem.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/fw/smem.c b/drivers/net/wireless/intel/iwlwifi/fw/smem.c
index 90fd69b4860c1..344ddde85b189 100644
--- a/drivers/net/wireless/intel/iwlwifi/fw/smem.c
+++ b/drivers/net/wireless/intel/iwlwifi/fw/smem.c
@@ -6,6 +6,7 @@
*/
#include "iwl-drv.h"
#include "runtime.h"
+#include "dbg.h"
#include "fw/api/commands.h"

static void iwl_parse_shared_mem_22000(struct iwl_fw_runtime *fwrt,
@@ -17,7 +18,9 @@ static void iwl_parse_shared_mem_22000(struct iwl_fw_runtime *fwrt,
u8 api_ver = iwl_fw_lookup_notif_ver(fwrt->fw, SYSTEM_GROUP,
SHARED_MEM_CFG_CMD, 0);

- if (WARN_ON(lmac_num > ARRAY_SIZE(mem_cfg->lmac_smem)))
+ /* Note: notification has 3 entries, but we only expect 2 */
+ if (IWL_FW_CHECK(fwrt, lmac_num > ARRAY_SIZE(fwrt->smem_cfg.lmac),
+ "FW advertises %d LMACs\n", lmac_num))
return;

fwrt->smem_cfg.num_lmacs = lmac_num;
@@ -26,7 +29,8 @@ static void iwl_parse_shared_mem_22000(struct iwl_fw_runtime *fwrt,
fwrt->smem_cfg.rxfifo2_size = le32_to_cpu(mem_cfg->rxfifo2_size);

if (api_ver >= 4 &&
- !WARN_ON_ONCE(iwl_rx_packet_payload_len(pkt) < sizeof(*mem_cfg))) {
+ !IWL_FW_CHECK(fwrt, iwl_rx_packet_payload_len(pkt) < sizeof(*mem_cfg),
+ "bad shared mem notification size\n")) {
fwrt->smem_cfg.rxfifo2_control_size =
le32_to_cpu(mem_cfg->rxfifo2_control_size);
}
--
2.51.0