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wifi: iwlwifi: fix potential use after free in iwl_mld_remove_link()

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[ Upstream commit 77e67d5daa ]

This code frees "link" by calling kfree_rcu(link, rcu_head) and then it
dereferences "link" to get the "link->fw_id".  Save the "link->fw_id"
first to avoid a potential use after free.

Fixes: d1e879ec60 ("wifi: iwlwifi: add iwlmld sub-driver")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://patch.msgid.link/aNKCcKlbSkkS4_gO@stanley.mountain
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dan Carpenter
2025-09-23 14:20:16 +03:00
committed by Greg Kroah-Hartman
parent cba094c188
commit 5b4a239c9f
1 changed files with 3 additions and 2 deletions
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5
drivers/net/wireless/intel/iwlwifi/mld/link.c
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@@ -501,6 +501,7 @@ void iwl_mld_remove_link(struct iwl_mld *mld,
struct iwl_mld_vif *mld_vif = iwl_mld_vif_from_mac80211(bss_conf->vif);
struct iwl_mld_link *link = iwl_mld_link_from_mac80211(bss_conf);
bool is_deflink = link == &mld_vif->deflink;
u8 fw_id = link->fw_id;
if (WARN_ON(!link || link->active))
return;
@@ -513,10 +514,10 @@ void iwl_mld_remove_link(struct iwl_mld *mld,
RCU_INIT_POINTER(mld_vif->link[bss_conf->link_id], NULL);
if (WARN_ON(link->fw_id >= mld->fw->ucode_capa.num_links))
if (WARN_ON(fw_id >= mld->fw->ucode_capa.num_links))
return;
RCU_INIT_POINTER(mld->fw_id_to_bss_conf[link->fw_id], NULL);
RCU_INIT_POINTER(mld->fw_id_to_bss_conf[fw_id], NULL);
}
void iwl_mld_handle_missed_beacon_notif(struct iwl_mld *mld,