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wifi: iwlwifi: mvm: avoid baid size integer overflow

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[ Upstream commit 1a528ab1da324d078ec60283c34c17848580df24 ]

Roee reported various hard-to-debug crashes with pings in
EHT aggregation scenarios. Enabling KASAN showed that we
access the BAID allocation out of bounds, and looking at
the code a bit shows that since the reorder buffer entry
(struct iwl_mvm_reorder_buf_entry) is 128 bytes if debug
such as lockdep is enabled, then staring from an agg size
512 we overflow the size calculation, and allocate a much
smaller structure than we should, causing slab corruption
once we initialize this.

Fix this by simply using u32 instead of u16.

Reported-by: Roee Goldfiner <roee.h.goldfiner@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230620125813.f428c856030d.I2c2bb808e945adb71bc15f5b2bac2d8957ea90eb@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Johannes Berg 2023-06-20 13:04:02 +03:00 committed by Greg Kroah-Hartman
parent a46a624914
commit 6862557e9a
1 changed files with 1 additions and 1 deletions
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2
drivers/net/wireless/intel/iwlwifi/mvm/sta.c
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@ -2738,7 +2738,7 @@ int iwl_mvm_sta_rx_agg(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
}
if (iwl_mvm_has_new_rx_api(mvm) && start) {
u16 reorder_buf_size = buf_size * sizeof(baid_data->entries[0]);
u32 reorder_buf_size = buf_size * sizeof(baid_data->entries[0]);
/* sparse doesn't like the __align() so don't check */
#ifndef __CHECKER__