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wifi: iwlwifi: mvm: avoid NULL pointer dereference

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[ Upstream commit 557a6cd847 ]

iwl_mvm_tx_skb_sta() and iwl_mvm_tx_mpdu() verify that the mvmvsta
pointer is not NULL.
It retrieves this pointer using iwl_mvm_sta_from_mac80211, which is
dereferencing the ieee80211_sta pointer.
If sta is NULL, iwl_mvm_sta_from_mac80211 will dereference a NULL
pointer.
Fix this by checking the sta pointer before retrieving the mvmsta
from it. If sta is not NULL, then mvmsta isn't either.

Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Link: https://patch.msgid.link/20240825191257.880921ce23b7.I340052d70ab6d3410724ce955eb00da10e08188f@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Miri Korenblit 2024-08-25 19:17:09 +03:00 committed by Greg Kroah-Hartman
parent 3241162554
commit 6dcadb2ed3
1 changed files with 7 additions and 5 deletions
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12
drivers/net/wireless/intel/iwlwifi/mvm/tx.c
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@ -1145,6 +1145,9 @@ static int iwl_mvm_tx_mpdu(struct iwl_mvm *mvm, struct sk_buff *skb,
bool is_ampdu = false;
int hdrlen;
if (WARN_ON_ONCE(!sta))
return -1;
mvmsta = iwl_mvm_sta_from_mac80211(sta);
fc = hdr->frame_control;
hdrlen = ieee80211_hdrlen(fc);
@ -1152,9 +1155,6 @@ static int iwl_mvm_tx_mpdu(struct iwl_mvm *mvm, struct sk_buff *skb,
if (IWL_MVM_NON_TRANSMITTING_AP && ieee80211_is_probe_resp(fc))
return -1;
if (WARN_ON_ONCE(!mvmsta))
return -1;
if (WARN_ON_ONCE(mvmsta->deflink.sta_id == IWL_MVM_INVALID_STA))
return -1;
@ -1285,7 +1285,7 @@ drop:
int iwl_mvm_tx_skb_sta(struct iwl_mvm *mvm, struct sk_buff *skb,
struct ieee80211_sta *sta)
{
struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
struct iwl_mvm_sta *mvmsta;
struct ieee80211_tx_info info;
struct sk_buff_head mpdus_skbs;
struct ieee80211_vif *vif;
@ -1294,9 +1294,11 @@ int iwl_mvm_tx_skb_sta(struct iwl_mvm *mvm, struct sk_buff *skb,
struct sk_buff *orig_skb = skb;
const u8 *addr3;
if (WARN_ON_ONCE(!mvmsta))
if (WARN_ON_ONCE(!sta))
return -1;
mvmsta = iwl_mvm_sta_from_mac80211(sta);
if (WARN_ON_ONCE(mvmsta->deflink.sta_id == IWL_MVM_INVALID_STA))
return -1;