This is a note to let you know that I've just added the patch titled
wifi: mt76: handle failure of vzalloc in mt7615_coredump_work
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
wifi-mt76-handle-failure-of-vzalloc-in-mt7615_coredu.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 6bbfc8ad23cdd82a2e4d7d58c61e2fcabec24981
Author: Kang Chen <void0red@xxxxxxxxx>
Date: Mon Feb 27 22:48:23 2023 +0800
wifi: mt76: handle failure of vzalloc in mt7615_coredump_work
[ Upstream commit 9e47dd9f64a47ae00ca0123017584c37209ee900 ]
vzalloc may fails, dump might be null and will cause
illegal address access later.
Link: https://lore.kernel.org/all/Y%2Fy5Asxw3T3m4jCw@lore-desk
Fixes: d2bf7959d9c0 ("mt76: mt7663: introduce coredump support")
Signed-off-by: Kang Chen <void0red@xxxxxxxxx>
Signed-off-by: Felix Fietkau <nbd@xxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
index c7e084821b292..37bc307c19719 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
@@ -2273,7 +2273,7 @@ void mt7615_coredump_work(struct work_struct *work)
break;
skb_pull(skb, sizeof(struct mt7615_mcu_rxd));
- if (data + skb->len - dump > MT76_CONNAC_COREDUMP_SZ) {
+ if (!dump || data + skb->len - dump > MT76_CONNAC_COREDUMP_SZ) {
dev_kfree_skb(skb);
continue;
}
@@ -2283,6 +2283,8 @@ void mt7615_coredump_work(struct work_struct *work)
dev_kfree_skb(skb);
}
- dev_coredumpv(dev->mt76.dev, dump, MT76_CONNAC_COREDUMP_SZ,
- GFP_KERNEL);
+
+ if (dump)
+ dev_coredumpv(dev->mt76.dev, dump, MT76_CONNAC_COREDUMP_SZ,
+ GFP_KERNEL);
}
