mac80211_hwsim: fix locking when iterating radios during ns exit

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The cleanup of radios during namespace exit has recently been reworked
to directly delete a radio while temporarily releasing the spinlock,
fixing a race condition between the work-queue execution and namespace
exits. However, the temporary unlock allows unsafe modifications on the
iterated list, resulting in a potential crash when continuing the
iteration of additional radios.

Move radios about to destroy to a temporary list, and clean that up
after releasing the spinlock once iteration is complete.

Fixes: 8cfd36a0b5 ("mac80211_hwsim: fix use-after-free bug in hwsim_exit_net")
Signed-off-by: Martin Willi <martin@strongswan.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

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Martin Willi 2018-09-25 09:41:13 +02:00 • committed by Johannes Berg

parent 30fe6d50eb

commit 628980e5c8

1 changed files with 7 additions and 4 deletions

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drivers/net/wireless/mac80211_hwsim.c

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