wifi: iwlwifi: mvm: remove unneeded NULL pointer checks

Smatch reported that we dereference the data pointer to calculate the
expected length before we check it's not NULL. While this is true (and
hence needs to be fixed), this will never happen because the data
pointer comes from struct iwl_rx_packet object which has the following
layout:

struct iwl_rx_packet {
        __le32 len_n_flags;
        struct iwl_cmd_header hdr;
        u8 data[];
} __packed;

So, if the pointer to iwl_rx_packet is valid, data will be valid as
well.

Remove the NULL pointer check on 'data' to avoid confusing smatch.
Also remove the check from similar functions in the same flow that were
cargo cult copy-pasted.

Fixes: 4635e6eaa0fe ("wifi: iwlwifi: mvm: support new versions of the wowlan APIs")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/r/202411210812.0eLaonw3-lkp@intel.com/
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20241229164246.c8ce6e041e4b.I4dc19289e3f3807386768c846e08be3ea322cd15@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/d3.c b/drivers/net/wireless/intel/iwlwifi/mvm/d3.c
index 385e1bdf2415eb5ad65e9610a1218e8f9c89874c..129b6bdf9ef90be7b54f1729705686b963b66d8e 100644 (file)
--- a/drivers/net/wireless/intel/iwlwifi/mvm/d3.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/d3.c
@@ -2491,12 +2491,6 @@ static void iwl_mvm_parse_wowlan_info_notif(struct iwl_mvm *mvm,
        u32 expected_len = sizeof(*data) +
                data->num_mlo_link_keys * sizeof(status->mlo_keys[0]);
 
-       if (!data) {
-               IWL_ERR(mvm, "iwl_wowlan_info_notif data is NULL\n");
-               status = NULL;
-               return;
-       }
-
        if (len < expected_len) {
                IWL_ERR(mvm, "Invalid WoWLAN info notification!\n");
                status = NULL;
@@ -2548,12 +2542,6 @@ iwl_mvm_parse_wowlan_info_notif_v4(struct iwl_mvm *mvm,
        u32 i;
        u32 expected_len = sizeof(*data);
 
-       if (!data) {
-               IWL_ERR(mvm, "iwl_wowlan_info_notif data is NULL\n");
-               status = NULL;
-               return;
-       }
-
        if (has_mlo_keys)
                expected_len += (data->num_mlo_link_keys *
                                 sizeof(status->mlo_keys[0]));
@@ -2602,12 +2590,6 @@ iwl_mvm_parse_wowlan_info_notif_v2(struct iwl_mvm *mvm,
 {
        u32 i;
 
-       if (!data) {
-               IWL_ERR(mvm, "iwl_wowlan_info_notif data is NULL\n");
-               status = NULL;
-               return;
-       }
-
        if (len < sizeof(*data)) {
                IWL_ERR(mvm, "Invalid WoWLAN info notification!\n");
                status = NULL;