From: Sean Wang sean.wang@mediatek.com
[ Upstream commit 723885a6750102e5d807429b3d06aa6b0d29cc66 ]
Fix the maximum size of the coredump generated with current mt7921 firmware. Otherwise, a truncated coredump would be reported to userland via dev_coredumpv.
Also, there is an additional error handling enhanced in the patch to avoid the possible invalid buffer access when the system failed to create the buffer to hold the coredump.
Fixes: 0da3c795d07b ("mt76: mt7921: add coredump support") Co-developed-by: YN Chen YN.Chen@mediatek.com Signed-off-by: YN Chen YN.Chen@mediatek.com Signed-off-by: Sean Wang sean.wang@mediatek.com Signed-off-by: Felix Fietkau nbd@nbd.name Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/wireless/mediatek/mt76/mt76_connac.h | 2 +- drivers/net/wireless/mediatek/mt76/mt7921/mac.c | 9 ++++++--- 2 files changed, 7 insertions(+), 4 deletions(-)
diff --git a/drivers/net/wireless/mediatek/mt76/mt76_connac.h b/drivers/net/wireless/mediatek/mt76/mt76_connac.h index 63c1d1a68a70..c26cfef425ed 100644 --- a/drivers/net/wireless/mediatek/mt76/mt76_connac.h +++ b/drivers/net/wireless/mediatek/mt76/mt76_connac.h @@ -12,7 +12,7 @@ #define MT76_CONNAC_MAX_SCAN_MATCH 16
#define MT76_CONNAC_COREDUMP_TIMEOUT (HZ / 20) -#define MT76_CONNAC_COREDUMP_SZ (128 * 1024) +#define MT76_CONNAC_COREDUMP_SZ (1300 * 1024)
enum { CMD_CBW_20MHZ = IEEE80211_STA_RX_BW_20, diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mac.c b/drivers/net/wireless/mediatek/mt76/mt7921/mac.c index 853db0a52181..493c2aba2f79 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7921/mac.c +++ b/drivers/net/wireless/mediatek/mt76/mt7921/mac.c @@ -1504,7 +1504,7 @@ void mt7921_coredump_work(struct work_struct *work) break;
skb_pull(skb, sizeof(struct mt7921_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; } @@ -1514,7 +1514,10 @@ void mt7921_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); + mt7921_reset(&dev->mt76); }