wifi: iwlwifi: mvm: Add locking to the rate read flow

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[ Upstream commit a8938bc881 ]

The rs_drv_get_rate flow reads the lq_sta to return the optimal rate
for tx frames. This read flow is not protected thereby leaving
a small window, a few instructions wide, open to contention by an
asynchronous rate update. Indeed this race condition was hit and the
update occurred in the middle of the read.

Fix this by locking the lq_sta struct during read.

Signed-off-by: Ariel Malamud <ariel.malamud@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230514120631.b52c9ed5c379.I15290b78e0d966c1b68278263776ca9de841d5fe@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Ariel Malamud 2023-05-14 12:15:55 +03:00 • committed by Greg Kroah-Hartman

parent 788f129f63

commit 7402fb48ef

1 changed files with 3 additions and 0 deletions

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drivers/net/wireless/intel/iwlwifi/mvm/rs.c

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