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| author | Felix Fietkau <nbd@nbd.name> | 2022-03-27 00:05:49 +0100 |
|---|---|---|
| committer | Hauke Mehrtens <hauke@hauke-m.de> | 2022-06-07 22:28:59 +0200 |
| commit | 33df033b73365487c5bb5a58b77aed04d4ca6ac1 (patch) | |
| tree | b9601996a92861e9dda93bf2816e3775e8a21d61 /package/kernel | |
| parent | d04a947b6b2fee6359aa6126068f70efaa3e48bc (diff) | |
| download | upstream-33df033b73365487c5bb5a58b77aed04d4ca6ac1.tar.gz upstream-33df033b73365487c5bb5a58b77aed04d4ca6ac1.tar.bz2 upstream-33df033b73365487c5bb5a58b77aed04d4ca6ac1.zip | |
mac80211: add a bug fix for a rare crash
Signed-off-by: Felix Fietkau <nbd@nbd.name>
(cherry picked from commit 9a93b62f315ad4c9f021c414ed80ba337ab4a01e)
Diffstat (limited to 'package/kernel')
| -rw-r--r-- | package/kernel/mac80211/patches/subsys/328-mac80211-do-not-wake-queues-on-a-vif-that-is-being-s.patch | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/package/kernel/mac80211/patches/subsys/328-mac80211-do-not-wake-queues-on-a-vif-that-is-being-s.patch b/package/kernel/mac80211/patches/subsys/328-mac80211-do-not-wake-queues-on-a-vif-that-is-being-s.patch new file mode 100644 index 0000000000..f0150ddef0 --- /dev/null +++ b/package/kernel/mac80211/patches/subsys/328-mac80211-do-not-wake-queues-on-a-vif-that-is-being-s.patch @@ -0,0 +1,38 @@ +From: Felix Fietkau <nbd@nbd.name> +Date: Sat, 26 Mar 2022 23:58:35 +0100 +Subject: [PATCH] mac80211: do not wake queues on a vif that is being stopped + +When a vif is being removed and sdata->bss is cleared, __ieee80211_wake_txqs +can still be called on it, which crashes as soon as sdata->bss is being +dereferenced. +To fix this properly, check for SDATA_STATE_RUNNING before waking queues, +and take the fq lock when setting it (to ensure that __ieee80211_wake_txqs +observes the change when running on a different CPU + +Signed-off-by: Felix Fietkau <nbd@nbd.name> +--- + +--- a/net/mac80211/iface.c ++++ b/net/mac80211/iface.c +@@ -377,7 +377,9 @@ static void ieee80211_do_stop(struct iee + bool cancel_scan; + struct cfg80211_nan_func *func; + ++ spin_lock_bh(&local->fq.lock); + clear_bit(SDATA_STATE_RUNNING, &sdata->state); ++ spin_unlock_bh(&local->fq.lock); + + cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata; + if (cancel_scan) +--- a/net/mac80211/util.c ++++ b/net/mac80211/util.c +@@ -301,6 +301,9 @@ static void __ieee80211_wake_txqs(struct + local_bh_disable(); + spin_lock(&fq->lock); + ++ if (!test_bit(SDATA_STATE_RUNNING, &sdata->state)) ++ goto out; ++ + if (sdata->vif.type == NL80211_IFTYPE_AP) + ps = &sdata->bss->ps; + |