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authorChin-Ran Lo <crlo@marvell.com>2014-06-06 19:37:10 -0700
committerJohn W. Linville <linville@tuxdriver.com>2014-06-16 11:23:33 -0400
commitbca463e80825433203f0c0de4bf6518f50a9b30d (patch)
treecf942fb8553ee53732bfac0ca5f05c9984042f8d /drivers/net/wireless
parentf15ec3451daf137a63d9cdc65ac5f863ce91fce5 (diff)
mwifiex: fix tx_info/rx_info overlap with PCIe dma_mapping
On PCIe Tx data path, network interface specific tx_info parameters such as bss_num and bss_type are saved at "skb->cb + sizeof(dma_addr_t)" (returned by MWIFIEX_SKB_TXCB). Later mwifiex_map_pci_memory() called from mwifiex_pcie_send_data() will memcpy sizeof(struct mwifiex_dma_mapping) bytes to save PCIe DMA address and length information at beginning of skb->cb. This accidently overwrites bss_num and bss_type saved in skb->cb previously because bss_num/bss_type and mwifiex_dma_mapping data overlap. Similarly, on PCIe Rx data path, rx_info parameters overlaps with PCIe DMA address and length information too. Fix it by defining mwifiex_cb structure and having MWIFIEX_SKB_TXCB and MWIFIEX_SKB_RXCB return the correct address of tx_info/rx_info using the structure members. Also add a BUILD_BUG_ON to maks sure that mwifiex_cb structure doesn't exceed the size of skb->cb. Reviewed-by: Aaron Durbin <adurbin@chromium.org> Signed-off-by: Chin-Ran Lo <crlo@marvell.com> Signed-off-by: Bing Zhao <bzhao@marvell.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless')
-rw-r--r--drivers/net/wireless/mwifiex/pcie.c4
-rw-r--r--drivers/net/wireless/mwifiex/util.h43
2 files changed, 35 insertions, 12 deletions
diff --git a/drivers/net/wireless/mwifiex/pcie.c b/drivers/net/wireless/mwifiex/pcie.c
index 574d4b597468..2cc9b6fca490 100644
--- a/drivers/net/wireless/mwifiex/pcie.c
+++ b/drivers/net/wireless/mwifiex/pcie.c
@@ -50,7 +50,7 @@ mwifiex_map_pci_memory(struct mwifiex_adapter *adapter, struct sk_buff *skb,
return -1;
}
mapping.len = size;
- memcpy(skb->cb, &mapping, sizeof(mapping));
+ mwifiex_store_mapping(skb, &mapping);
return 0;
}
@@ -60,7 +60,7 @@ static void mwifiex_unmap_pci_memory(struct mwifiex_adapter *adapter,
struct pcie_service_card *card = adapter->card;
struct mwifiex_dma_mapping mapping;
- MWIFIEX_SKB_PACB(skb, &mapping);
+ mwifiex_get_mapping(skb, &mapping);
pci_unmap_single(card->dev, mapping.addr, mapping.len, flags);
}
diff --git a/drivers/net/wireless/mwifiex/util.h b/drivers/net/wireless/mwifiex/util.h
index ddae57021397..caadb3737b9e 100644
--- a/drivers/net/wireless/mwifiex/util.h
+++ b/drivers/net/wireless/mwifiex/util.h
@@ -20,32 +20,55 @@
#ifndef _MWIFIEX_UTIL_H_
#define _MWIFIEX_UTIL_H_
+struct mwifiex_dma_mapping {
+ dma_addr_t addr;
+ size_t len;
+};
+
+struct mwifiex_cb {
+ struct mwifiex_dma_mapping dma_mapping;
+ union {
+ struct mwifiex_rxinfo rx_info;
+ struct mwifiex_txinfo tx_info;
+ };
+};
+
static inline struct mwifiex_rxinfo *MWIFIEX_SKB_RXCB(struct sk_buff *skb)
{
- return (struct mwifiex_rxinfo *)(skb->cb + sizeof(dma_addr_t));
+ struct mwifiex_cb *cb = (struct mwifiex_cb *)skb->cb;
+
+ BUILD_BUG_ON(sizeof(struct mwifiex_cb) > sizeof(skb->cb));
+ return &cb->rx_info;
}
static inline struct mwifiex_txinfo *MWIFIEX_SKB_TXCB(struct sk_buff *skb)
{
- return (struct mwifiex_txinfo *)(skb->cb + sizeof(dma_addr_t));
+ struct mwifiex_cb *cb = (struct mwifiex_cb *)skb->cb;
+
+ return &cb->tx_info;
}
-struct mwifiex_dma_mapping {
- dma_addr_t addr;
- size_t len;
-};
+static inline void mwifiex_store_mapping(struct sk_buff *skb,
+ struct mwifiex_dma_mapping *mapping)
+{
+ struct mwifiex_cb *cb = (struct mwifiex_cb *)skb->cb;
+
+ memcpy(&cb->dma_mapping, mapping, sizeof(*mapping));
+}
-static inline void MWIFIEX_SKB_PACB(struct sk_buff *skb,
- struct mwifiex_dma_mapping *mapping)
+static inline void mwifiex_get_mapping(struct sk_buff *skb,
+ struct mwifiex_dma_mapping *mapping)
{
- memcpy(mapping, skb->cb, sizeof(*mapping));
+ struct mwifiex_cb *cb = (struct mwifiex_cb *)skb->cb;
+
+ memcpy(mapping, &cb->dma_mapping, sizeof(*mapping));
}
static inline dma_addr_t MWIFIEX_SKB_DMA_ADDR(struct sk_buff *skb)
{
struct mwifiex_dma_mapping mapping;
- MWIFIEX_SKB_PACB(skb, &mapping);
+ mwifiex_get_mapping(skb, &mapping);
return mapping.addr;
}