[PATCH 5.15/6.1/6.6/6.12] wifi: iwlwifi: fix 22000 series SMEM parsing
From: Nazar Kalashnikov <hidden>
Date: 2026-06-15 12:23:26
Also in:
linux-wireless, lkml, stable
Subsystem:
intel wireless wifi link (iwlwifi), the rest · Maintainers:
Miri Korenblit, Linus Torvalds
From: Johannes Berg <redacted> commit 58192b9ce09b0f0f86e2036683bd542130b91a98 upstream. 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 <redacted> Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com> Link: https://patch.msgid.link/20251110150012.16e8c2d70c26.Iadfcc1aedf43c5175b3f0757bea5aa232454f1ac@changeid Signed-off-by: Nazar Kalashnikov <redacted> --- Backport fix for CVE-2026-43172 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 3f1272014daf..e2fc2f5de442 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); }
--
2.47.3