From 403ea939ea6a2fc322d93de40a2babd1fe9e6a19 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Tue, 12 Jan 2021 14:24:49 +0100 Subject: [PATCH] iwlwifi: dbg: Mark ucode tlv data as const The ucode TLV data may be read-only and should be treated as const pointers, but currently a few code forcibly cast to the writable pointer unnecessarily. This gave developers a wrong impression as if it can be modified, resulting in crashing regressions already a couple of times. This patch adds the const prefix to those cast pointers, so that such attempt can be caught more easily in future. Signed-off-by: Takashi Iwai Acked-by: Luca Coelho Link: https://lore.kernel.org/r/20210112132449.22243-3-tiwai@suse.de Signed-off-by: Luca Coelho --- drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c | 50 ++++++++++++------------ drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.h | 2 +- drivers/net/wireless/intel/iwlwifi/iwl-drv.c | 2 +- 3 files changed, 28 insertions(+), 26 deletions(-) diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c b/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c index a80a35a..12c49fe 100644 --- a/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c +++ b/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c @@ -61,7 +61,8 @@ dbg_ver_table[IWL_DBG_TLV_TYPE_NUM] = { [IWL_DBG_TLV_TYPE_TRIGGER] = {.min_ver = 1, .max_ver = 1,}, }; -static int iwl_dbg_tlv_add(struct iwl_ucode_tlv *tlv, struct list_head *list) +static int iwl_dbg_tlv_add(const struct iwl_ucode_tlv *tlv, + struct list_head *list) { u32 len = le32_to_cpu(tlv->length); struct iwl_dbg_tlv_node *node; @@ -76,9 +77,9 @@ static int iwl_dbg_tlv_add(struct iwl_ucode_tlv *tlv, struct list_head *list) return 0; } -static bool iwl_dbg_tlv_ver_support(struct iwl_ucode_tlv *tlv) +static bool iwl_dbg_tlv_ver_support(const struct iwl_ucode_tlv *tlv) { - struct iwl_fw_ini_header *hdr = (void *)&tlv->data[0]; + const struct iwl_fw_ini_header *hdr = (const void *)&tlv->data[0]; u32 type = le32_to_cpu(tlv->type); u32 tlv_idx = type - IWL_UCODE_TLV_DEBUG_BASE; u32 ver = le32_to_cpu(hdr->version); @@ -91,9 +92,9 @@ static bool iwl_dbg_tlv_ver_support(struct iwl_ucode_tlv *tlv) } static int iwl_dbg_tlv_alloc_debug_info(struct iwl_trans *trans, - struct iwl_ucode_tlv *tlv) + const struct iwl_ucode_tlv *tlv) { - struct iwl_fw_ini_debug_info_tlv *debug_info = (void *)tlv->data; + const struct iwl_fw_ini_debug_info_tlv *debug_info = (const void *)tlv->data; if (le32_to_cpu(tlv->length) != sizeof(*debug_info)) return -EINVAL; @@ -105,9 +106,9 @@ static int iwl_dbg_tlv_alloc_debug_info(struct iwl_trans *trans, } static int iwl_dbg_tlv_alloc_buf_alloc(struct iwl_trans *trans, - struct iwl_ucode_tlv *tlv) + const struct iwl_ucode_tlv *tlv) { - struct iwl_fw_ini_allocation_tlv *alloc = (void *)tlv->data; + const struct iwl_fw_ini_allocation_tlv *alloc = (const void *)tlv->data; u32 buf_location; u32 alloc_id; @@ -145,9 +146,9 @@ err: } static int iwl_dbg_tlv_alloc_hcmd(struct iwl_trans *trans, - struct iwl_ucode_tlv *tlv) + const struct iwl_ucode_tlv *tlv) { - struct iwl_fw_ini_hcmd_tlv *hcmd = (void *)tlv->data; + const struct iwl_fw_ini_hcmd_tlv *hcmd = (const void *)tlv->data; u32 tp = le32_to_cpu(hcmd->time_point); if (le32_to_cpu(tlv->length) <= sizeof(*hcmd)) @@ -169,9 +170,9 @@ static int iwl_dbg_tlv_alloc_hcmd(struct iwl_trans *trans, } static int iwl_dbg_tlv_alloc_region(struct iwl_trans *trans, - struct iwl_ucode_tlv *tlv) + const struct iwl_ucode_tlv *tlv) { - struct iwl_fw_ini_region_tlv *reg = (void *)tlv->data; + const struct iwl_fw_ini_region_tlv *reg = (const void *)tlv->data; struct iwl_ucode_tlv **active_reg; u32 id = le32_to_cpu(reg->id); u32 type = le32_to_cpu(reg->type); @@ -214,9 +215,10 @@ static int iwl_dbg_tlv_alloc_region(struct iwl_trans *trans, } static int iwl_dbg_tlv_alloc_trigger(struct iwl_trans *trans, - struct iwl_ucode_tlv *tlv) + const struct iwl_ucode_tlv *tlv) { - struct iwl_fw_ini_trigger_tlv *trig = (void *)tlv->data; + const struct iwl_fw_ini_trigger_tlv *trig = (const void *)tlv->data; + struct iwl_fw_ini_trigger_tlv *dup_trig; u32 tp = le32_to_cpu(trig->time_point); struct iwl_ucode_tlv *dup = NULL; int ret; @@ -237,8 +239,8 @@ static int iwl_dbg_tlv_alloc_trigger(struct iwl_trans *trans, GFP_KERNEL); if (!dup) return -ENOMEM; - trig = (void *)dup->data; - trig->occurrences = cpu_to_le32(-1); + dup_trig = (void *)dup->data; + dup_trig->occurrences = cpu_to_le32(-1); tlv = dup; } @@ -249,7 +251,7 @@ static int iwl_dbg_tlv_alloc_trigger(struct iwl_trans *trans, } static int (*dbg_tlv_alloc[])(struct iwl_trans *trans, - struct iwl_ucode_tlv *tlv) = { + const struct iwl_ucode_tlv *tlv) = { [IWL_DBG_TLV_TYPE_DEBUG_INFO] = iwl_dbg_tlv_alloc_debug_info, [IWL_DBG_TLV_TYPE_BUF_ALLOC] = iwl_dbg_tlv_alloc_buf_alloc, [IWL_DBG_TLV_TYPE_HCMD] = iwl_dbg_tlv_alloc_hcmd, @@ -257,10 +259,10 @@ static int (*dbg_tlv_alloc[])(struct iwl_trans *trans, [IWL_DBG_TLV_TYPE_TRIGGER] = iwl_dbg_tlv_alloc_trigger, }; -void iwl_dbg_tlv_alloc(struct iwl_trans *trans, struct iwl_ucode_tlv *tlv, +void iwl_dbg_tlv_alloc(struct iwl_trans *trans, const struct iwl_ucode_tlv *tlv, bool ext) { - struct iwl_fw_ini_header *hdr = (void *)&tlv->data[0]; + const struct iwl_fw_ini_header *hdr = (const void *)&tlv->data[0]; u32 type = le32_to_cpu(tlv->type); u32 tlv_idx = type - IWL_UCODE_TLV_DEBUG_BASE; u32 domain = le32_to_cpu(hdr->domain); @@ -396,7 +398,7 @@ void iwl_dbg_tlv_free(struct iwl_trans *trans) static int iwl_dbg_tlv_parse_bin(struct iwl_trans *trans, const u8 *data, size_t len) { - struct iwl_ucode_tlv *tlv; + const struct iwl_ucode_tlv *tlv; u32 tlv_len; while (len >= sizeof(*tlv)) { @@ -737,12 +739,12 @@ static void iwl_dbg_tlv_set_periodic_trigs(struct iwl_fw_runtime *fwrt) } } -static bool is_trig_data_contained(struct iwl_ucode_tlv *new, - struct iwl_ucode_tlv *old) +static bool is_trig_data_contained(const struct iwl_ucode_tlv *new, + const struct iwl_ucode_tlv *old) { - struct iwl_fw_ini_trigger_tlv *new_trig = (void *)new->data; - struct iwl_fw_ini_trigger_tlv *old_trig = (void *)old->data; - __le32 *new_data = new_trig->data, *old_data = old_trig->data; + const struct iwl_fw_ini_trigger_tlv *new_trig = (const void *)new->data; + const struct iwl_fw_ini_trigger_tlv *old_trig = (const void *)old->data; + const __le32 *new_data = new_trig->data, *old_data = old_trig->data; u32 new_dwords_num = iwl_tlv_array_len(new, new_trig, data); u32 old_dwords_num = iwl_tlv_array_len(old, old_trig, data); int i, j; diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.h b/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.h index 2468238..e9f19ec 100644 --- a/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.h +++ b/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.h @@ -43,7 +43,7 @@ struct iwl_fw_runtime; void iwl_dbg_tlv_load_bin(struct device *dev, struct iwl_trans *trans); void iwl_dbg_tlv_free(struct iwl_trans *trans); -void iwl_dbg_tlv_alloc(struct iwl_trans *trans, struct iwl_ucode_tlv *tlv, +void iwl_dbg_tlv_alloc(struct iwl_trans *trans, const struct iwl_ucode_tlv *tlv, bool ext); void iwl_dbg_tlv_init(struct iwl_trans *trans); void iwl_dbg_tlv_time_point(struct iwl_fw_runtime *fwrt, diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-drv.c b/drivers/net/wireless/intel/iwlwifi/iwl-drv.c index 263c3c0..eb168dc 100644 --- a/drivers/net/wireless/intel/iwlwifi/iwl-drv.c +++ b/drivers/net/wireless/intel/iwlwifi/iwl-drv.c @@ -559,7 +559,7 @@ static int iwl_parse_tlv_firmware(struct iwl_drv *drv, bool *usniffer_images) { struct iwl_tlv_ucode_header *ucode = (void *)ucode_raw->data; - struct iwl_ucode_tlv *tlv; + const struct iwl_ucode_tlv *tlv; size_t len = ucode_raw->size; const u8 *data; u32 tlv_len; -- 2.7.4