Under heavy memory pressure, it is possible for the allocation of a
new skb to fail. When this happens, the kernel gets a memory access
violation. Previous versions of the drivers would drop the read request;
however, this logic was missed in the 3.18 update. This patch restores
the previous behavior.
Reported-by: Eric Biggers <ebiggers3@xxxxxxxxx>
Signed-off-by: Larry Finger <Larry.Finger@xxxxxxxxxxxx>
Cc: Eric Biggers <ebiggers3@xxxxxxxxx>
Cc: Stable <stable@xxxxxxxxxxxxxxx> [3.18]
---
drivers/net/wireless/rtlwifi/pci.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)
diff --git a/drivers/net/wireless/rtlwifi/pci.c b/drivers/net/wireless/rtlwifi/pci.c
index 846a2e6..55334ca 100644
--- a/drivers/net/wireless/rtlwifi/pci.c
+++ b/drivers/net/wireless/rtlwifi/pci.c
@@ -912,13 +912,15 @@ static void _rtl_pci_rx_interrupt(struct ieee80211_hw *hw)
}
end:
if (rtlpriv->use_new_trx_flow) {
- _rtl_pci_init_one_rxdesc(hw, (u8 *)buffer_desc,
- rxring_idx,
- rtlpci->rx_ring[rxring_idx].idx);
+ if (!_rtl_pci_init_one_rxdesc(hw, (u8 *)buffer_desc,
+ rxring_idx,
+ rtlpci->rx_ring[rxring_idx].idx))
+ return;
} else {
- _rtl_pci_init_one_rxdesc(hw, (u8 *)pdesc, rxring_idx,
- rtlpci->rx_ring[rxring_idx].idx);
-
+ if (!_rtl_pci_init_one_rxdesc(hw, (u8 *)pdesc,
+ rxring_idx,
+ rtlpci->rx_ring[rxring_idx].idx))
+ return;
if (rtlpci->rx_ring[rxring_idx].idx ==
rtlpci->rxringcount - 1)
rtlpriv->cfg->ops->set_desc(hw, (u8 *)pdesc,
--
2.1.2
--
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