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| author | Lorenzo Bianconi <lorenzo@kernel.org> | 2021-02-07 12:48:31 +0100 |
|---|---|---|
| committer | Kalle Valo <kvalo@codeaurora.org> | 2021-02-26 13:49:57 +0200 |
| commit | d0bd52c591a1070c54dc428e926660eb4f981099 (patch) | |
| tree | 1fc109dc82f11a58c263b898896f3ced82c7c51e /drivers/net/wireless/mediatek/mt76/dma.c | |
| parent | fb5fabb192b22293b70bc3351696473c50746d90 (diff) | |
| download | linux-stable-d0bd52c591a1070c54dc428e926660eb4f981099.tar.gz linux-stable-d0bd52c591a1070c54dc428e926660eb4f981099.tar.bz2 linux-stable-d0bd52c591a1070c54dc428e926660eb4f981099.zip | |
mt76: dma: do not report truncated frames to mac80211
Commit b102f0c522cf6 ("mt76: fix array overflow on receiving too many
fragments for a packet") fixes a possible OOB access but it introduces a
memory leak since the pending frame is not released to page_frag_cache
if the frag array of skb_shared_info is full. Commit 93a1d4791c10
("mt76: dma: fix a possible memory leak in mt76_add_fragment()") fixes
the issue but does not free the truncated skb that is forwarded to
mac80211 layer. Fix the leftover issue discarding even truncated skbs.
Fixes: 93a1d4791c10 ("mt76: dma: fix a possible memory leak in mt76_add_fragment()")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/a03166fcc8214644333c68674a781836e0f57576.1612697217.git.lorenzo@kernel.org
Diffstat (limited to 'drivers/net/wireless/mediatek/mt76/dma.c')
| -rw-r--r-- | drivers/net/wireless/mediatek/mt76/dma.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/net/wireless/mediatek/mt76/dma.c b/drivers/net/wireless/mediatek/mt76/dma.c index abdc8d364361..2f27c43ad76d 100644 --- a/drivers/net/wireless/mediatek/mt76/dma.c +++ b/drivers/net/wireless/mediatek/mt76/dma.c @@ -512,13 +512,13 @@ mt76_add_fragment(struct mt76_dev *dev, struct mt76_queue *q, void *data, { struct sk_buff *skb = q->rx_head; struct skb_shared_info *shinfo = skb_shinfo(skb); + int nr_frags = shinfo->nr_frags; - if (shinfo->nr_frags < ARRAY_SIZE(shinfo->frags)) { + if (nr_frags < ARRAY_SIZE(shinfo->frags)) { struct page *page = virt_to_head_page(data); int offset = data - page_address(page) + q->buf_offset; - skb_add_rx_frag(skb, shinfo->nr_frags, page, offset, len, - q->buf_size); + skb_add_rx_frag(skb, nr_frags, page, offset, len, q->buf_size); } else { skb_free_frag(data); } @@ -527,7 +527,10 @@ mt76_add_fragment(struct mt76_dev *dev, struct mt76_queue *q, void *data, return; q->rx_head = NULL; - dev->drv->rx_skb(dev, q - dev->q_rx, skb); + if (nr_frags < ARRAY_SIZE(shinfo->frags)) + dev->drv->rx_skb(dev, q - dev->q_rx, skb); + else + dev_kfree_skb(skb); } static int |