mac80211: avoid crashing on invalid band info

[openwrt/openwrt.git] / package / kernel / mac80211 / patches / subsys / 780-avoid-crashing-missing-band.patch

diff --git a/package/kernel/mac80211/patches/subsys/780-avoid-crashing-missing-band.patch b/package/kernel/mac80211/patches/subsys/780-avoid-crashing-missing-band.patch
new file mode 100644 (file)
index 0000000..2bc11ef
--- /dev/null
+++ b/package/kernel/mac80211/patches/subsys/780-avoid-crashing-missing-band.patch
@@ -0,0 +1,34 @@
+From: David Bauer <mail@david-bauer.net>
+Date: Thu, 30 Nov 2023 07:32:52 +0100
+Subject: [PATCH] mac80211: avoid crashing on invalid band info
+
+Frequent crashes have been observed on MT7916 based platforms. While the
+root of these crashes are currently unknown, they happen when decoding
+rate information of connected STAs in AP mode. The rate-information is
+associated with a band which is not available on the PHY.
+
+Check for this condition in order to avoid crashing the whole system.
+This patch should be removed once the roout cause has been found and
+fixed.
+
+Link: https://github.com/freifunk-gluon/gluon/issues/2980
+
+Signed-off-by: David Bauer <mail@david-bauer.net>
+---
+
+--- a/net/mac80211/sta_info.c
++++ b/net/mac80211/sta_info.c
+@@ -2422,6 +2422,13 @@ static void sta_stats_decode_rate(struct
+ 
+               sband = local->hw.wiphy->bands[band];
+ 
++              if (!sband) {
++                      wiphy_warn(local->hw.wiphy,
++                                  "Invalid band %d\n",
++                                  band);
++                      break;
++              }
++
+               if (WARN_ON_ONCE(!sband->bitrates))
+                       break;
+