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wifi: mac80211: limit reorder_buf_filtered to avoid UBSAN warning
authorPing-Ke Shih <pkshih@realtek.com>
Fri, 18 Aug 2023 01:40:04 +0000 (09:40 +0800)
committerJohannes Berg <johannes.berg@intel.com>
Mon, 21 Aug 2023 07:49:54 +0000 (09:49 +0200)
commitb98c16107cc1647242abbd11f234c05a3a5864f6
tree8e3db071276cec3efbcad9e82ad9bc1b1dfff4f7
parent609a1bcd7bebac90a1b443e9fed47fd48dac5799
wifi: mac80211: limit reorder_buf_filtered to avoid UBSAN warning

The commit 06470f7468c8 ("mac80211: add API to allow filtering frames in BA sessions")
added reorder_buf_filtered to mark frames filtered by firmware, and it
can only work correctly if hw.max_rx_aggregation_subframes <= 64 since
it stores the bitmap in a u64 variable.

However, new HE or EHT devices can support BlockAck number up to 256 or
1024, and then using a higher subframe index leads UBSAN warning:

 UBSAN: shift-out-of-bounds in net/mac80211/rx.c:1129:39
 shift exponent 215 is too large for 64-bit type 'long long unsigned int'
 Call Trace:
  <IRQ>
  dump_stack_lvl+0x48/0x70
  dump_stack+0x10/0x20
  __ubsan_handle_shift_out_of_bounds+0x1ac/0x360
  ieee80211_release_reorder_frame.constprop.0.cold+0x64/0x69 [mac80211]
  ieee80211_sta_reorder_release+0x9c/0x400 [mac80211]
  ieee80211_prepare_and_rx_handle+0x1234/0x1420 [mac80211]
  ieee80211_rx_list+0xaef/0xf60 [mac80211]
  ieee80211_rx_napi+0x53/0xd0 [mac80211]

Since only old hardware that supports <=64 BlockAck uses
ieee80211_mark_rx_ba_filtered_frames(), limit the use as it is, so add a
WARN_ONCE() and comment to note to avoid using this function if hardware
capability is not suitable.

Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://lore.kernel.org/r/20230818014004.16177-1-pkshih@realtek.com
[edit commit message]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
include/net/mac80211.h
net/mac80211/rx.c