[PATCH AUTOSEL 4.19 187/671] mt76: usb: fix possible memory leak in mt76u_buf_free
From: Sasha Levin <sashal@kernel.org>
Date: 2020-01-16 17:01:28
Also in:
linux-mediatek, linux-wireless, lkml, netdev, stable
Subsystem:
mediatek mt76 wireless lan driver, the rest · Maintainers:
Felix Fietkau, Lorenzo Bianconi, Ryder Lee, Linus Torvalds
From: Lorenzo Bianconi <redacted>
[ Upstream commit cb83585e1121bd6d6c039cf09fa32380bf8b6258 ]
Move q->ndesc initialization before the for loop in mt76u_alloc_rx
since otherwise allocated urbs will not be freed in mt76u_buf_free
Double-check scatterlist pointer in mt76u_buf_free
Fixes: b40b15e1521f ("mt76: add usb support to mt76 layer")
Signed-off-by: Lorenzo Bianconi <redacted>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/wireless/mediatek/mt76/usb.c | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)
diff --git a/drivers/net/wireless/mediatek/mt76/usb.c b/drivers/net/wireless/mediatek/mt76/usb.c
index 8d40e92fb6f2..dcf927de65f3 100644
--- a/drivers/net/wireless/mediatek/mt76/usb.c
+++ b/drivers/net/wireless/mediatek/mt76/usb.c@@ -273,10 +273,16 @@ EXPORT_SYMBOL_GPL(mt76u_buf_alloc); void mt76u_buf_free(struct mt76u_buf *buf) { struct urb *urb = buf->urb; + struct scatterlist *sg; int i; - for (i = 0; i < urb->num_sgs; i++) - skb_free_frag(sg_virt(&urb->sg[i])); + for (i = 0; i < urb->num_sgs; i++) { + sg = &urb->sg[i]; + if (!sg) + continue; + + skb_free_frag(sg_virt(sg)); + } usb_free_urb(buf->urb); } EXPORT_SYMBOL_GPL(mt76u_buf_free);
@@ -478,7 +484,8 @@ static int mt76u_alloc_rx(struct mt76_dev *dev) nsgs = 1; } - for (i = 0; i < MT_NUM_RX_ENTRIES; i++) { + q->ndesc = MT_NUM_RX_ENTRIES; + for (i = 0; i < q->ndesc; i++) { err = mt76u_buf_alloc(dev, &q->entry[i].ubuf, nsgs, q->buf_size, SKB_WITH_OVERHEAD(q->buf_size),
@@ -486,7 +493,6 @@ static int mt76u_alloc_rx(struct mt76_dev *dev) if (err < 0) return err; } - q->ndesc = MT_NUM_RX_ENTRIES; return mt76u_submit_rx_buffers(dev); }
--
2.20.1
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