diff options
| author | Larry Finger <Larry.Finger@lwfinger.net> | 2015-12-21 17:05:08 -0600 |
|---|---|---|
| committer | Kalle Valo <kvalo@codeaurora.org> | 2015-12-30 17:36:05 +0200 |
| commit | f99551a2d39dc26ea03dc6761be11ac913eb2d57 (patch) | |
| tree | 9cec45741d34ba37f6ea551488200a3597b49bd1 | |
| parent | d47762633fd2b2471868266d55acb6f3a5b4052b (diff) | |
| download | linux-f99551a2d39dc26ea03dc6761be11ac913eb2d57.tar.bz2 | |
rtlwifi: rtl_pci: Fix kernel panic
In commit 38506ecefab9 (rtlwifi: rtl_pci: Start modification for new
drivers), a bug was introduced that causes a NULL pointer dereference.
As this bug only affects the infrequently used RTL8192EE and only under
low-memory conditions, it has taken a long time for the bug to show up.
The bug was reported on the linux-wireless mailing list and also at
https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/ as
bug #1527603 (kernel crashes due to rtl8192ee driver on ubuntu 15.10).
Fixes: 38506ecefab9 ("rtlwifi: rtl_pci: Start modification for new drivers")
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Cc: Stable <stable@vger.kernel.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
| -rw-r--r-- | drivers/net/wireless/realtek/rtlwifi/pci.c | 11 |
1 files changed, 3 insertions, 8 deletions
diff --git a/drivers/net/wireless/realtek/rtlwifi/pci.c b/drivers/net/wireless/realtek/rtlwifi/pci.c index f46c9d7f6528..7f471bff435c 100644 --- a/drivers/net/wireless/realtek/rtlwifi/pci.c +++ b/drivers/net/wireless/realtek/rtlwifi/pci.c @@ -801,7 +801,9 @@ static void _rtl_pci_rx_interrupt(struct ieee80211_hw *hw) hw_queue); if (rx_remained_cnt == 0) return; - + buffer_desc = &rtlpci->rx_ring[rxring_idx].buffer_desc[ + rtlpci->rx_ring[rxring_idx].idx]; + pdesc = (struct rtl_rx_desc *)skb->data; } else { /* rx descriptor */ pdesc = &rtlpci->rx_ring[rxring_idx].desc[ rtlpci->rx_ring[rxring_idx].idx]; @@ -824,13 +826,6 @@ static void _rtl_pci_rx_interrupt(struct ieee80211_hw *hw) new_skb = dev_alloc_skb(rtlpci->rxbuffersize); if (unlikely(!new_skb)) goto no_new; - if (rtlpriv->use_new_trx_flow) { - buffer_desc = - &rtlpci->rx_ring[rxring_idx].buffer_desc - [rtlpci->rx_ring[rxring_idx].idx]; - /*means rx wifi info*/ - pdesc = (struct rtl_rx_desc *)skb->data; - } memset(&rx_status , 0 , sizeof(rx_status)); rtlpriv->cfg->ops->query_rx_desc(hw, &stats, &rx_status, (u8 *)pdesc, skb); |