[PATCH v3] wifi: mt76: handle failure of vzalloc in mt7615_coredump_work
From: void0red <hidden>
Date: 2023-02-27 14:48:51
Also in:
linux-arm-kernel, linux-mediatek, linux-wireless, lkml
Subsystem:
mediatek mt76 wireless lan driver, the rest · Maintainers:
Felix Fietkau, Lorenzo Bianconi, Ryder Lee, Linus Torvalds
From: Kang Chen <redacted> vzalloc may fails, dump might be null and will cause illegal address access later. Link: https://lore.kernel.org/all/Y%2Fy5Asxw3T3m4jCw@lore-desk (local) Fixes: d2bf7959d9c0 ("mt76: mt7663: introduce coredump support") Signed-off-by: Kang Chen <redacted> --- v3 -> v2: fix bugs v2 -> v1: add Fixes tag drivers/net/wireless/mediatek/mt76/mt7615/mac.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
index a95602473..796768011 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c@@ -2380,7 +2380,7 @@ 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; }
@@ -2390,6 +2390,8 @@ 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); }
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2.34.1