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authorStefano Brivio <stefano.brivio@polimi.it>2008-04-14 00:59:49 +0200
committerJohn W. Linville <linville@tuxdriver.com>2008-04-15 15:04:36 -0400
commitdc4ae1f46dbbcd08b3b5e23ad5ef87bf4bb41adf (patch)
tree65909ff221f8eec95867a78d2687be82262ac2ef
parentb3fc9c6c58c986f7a24fd8b0794d1e0794935a28 (diff)
downloadlinux-dc4ae1f46dbbcd08b3b5e23ad5ef87bf4bb41adf.tar.gz
linux-dc4ae1f46dbbcd08b3b5e23ad5ef87bf4bb41adf.tar.xz
b43legacy: fix DMA mapping leakage
This fixes a DMA mapping leakage in the case where we reject a DMA buffer because of its address. The patch by Michael Buesch has been ported to b43legacy. Signed-off-by: Stefano Brivio <stefano.brivio@polimi.it> Cc: Christian Casteyde <casteyde.christian@free.fr> Signed-off-by: John W. Linville <linville@tuxdriver.com>
-rw-r--r--drivers/net/wireless/b43legacy/dma.c29
1 files changed, 18 insertions, 11 deletions
diff --git a/drivers/net/wireless/b43legacy/dma.c b/drivers/net/wireless/b43legacy/dma.c
index 5930048..c990f87 100644
--- a/drivers/net/wireless/b43legacy/dma.c
+++ b/drivers/net/wireless/b43legacy/dma.c
@@ -585,8 +585,9 @@ static int b43legacy_dmacontroller_tx_reset(struct b43legacy_wldev *dev,
/* Check if a DMA mapping address is invalid. */
static bool b43legacy_dma_mapping_error(struct b43legacy_dmaring *ring,
- dma_addr_t addr,
- size_t buffersize)
+ dma_addr_t addr,
+ size_t buffersize,
+ bool dma_to_device)
{
if (unlikely(dma_mapping_error(addr)))
return 1;
@@ -594,11 +595,11 @@ static bool b43legacy_dma_mapping_error(struct b43legacy_dmaring *ring,
switch (ring->type) {
case B43legacy_DMA_30BIT:
if ((u64)addr + buffersize > (1ULL << 30))
- return 1;
+ goto address_error;
break;
case B43legacy_DMA_32BIT:
if ((u64)addr + buffersize > (1ULL << 32))
- return 1;
+ goto address_error;
break;
case B43legacy_DMA_64BIT:
/* Currently we can't have addresses beyond 64 bits in the kernel. */
@@ -607,6 +608,12 @@ static bool b43legacy_dma_mapping_error(struct b43legacy_dmaring *ring,
/* The address is OK. */
return 0;
+
+address_error:
+ /* We can't support this address. Unmap it again. */
+ unmap_descbuffer(ring, addr, buffersize, dma_to_device);
+
+ return 1;
}
static int setup_rx_descbuffer(struct b43legacy_dmaring *ring,
@@ -626,7 +633,7 @@ static int setup_rx_descbuffer(struct b43legacy_dmaring *ring,
return -ENOMEM;
dmaaddr = map_descbuffer(ring, skb->data,
ring->rx_buffersize, 0);
- if (b43legacy_dma_mapping_error(ring, dmaaddr, ring->rx_buffersize)) {
+ if (b43legacy_dma_mapping_error(ring, dmaaddr, ring->rx_buffersize, 0)) {
/* ugh. try to realloc in zone_dma */
gfp_flags |= GFP_DMA;
@@ -639,7 +646,7 @@ static int setup_rx_descbuffer(struct b43legacy_dmaring *ring,
ring->rx_buffersize, 0);
}
- if (b43legacy_dma_mapping_error(ring, dmaaddr, ring->rx_buffersize)) {
+ if (b43legacy_dma_mapping_error(ring, dmaaddr, ring->rx_buffersize, 0)) {
dev_kfree_skb_any(skb);
return -EIO;
}
@@ -891,7 +898,7 @@ struct b43legacy_dmaring *b43legacy_setup_dmaring(struct b43legacy_wldev *dev,
DMA_TO_DEVICE);
if (b43legacy_dma_mapping_error(ring, dma_test,
- sizeof(struct b43legacy_txhdr_fw3))) {
+ sizeof(struct b43legacy_txhdr_fw3), 1)) {
/* ugh realloc */
kfree(ring->txhdr_cache);
ring->txhdr_cache = kcalloc(nr_slots,
@@ -906,7 +913,7 @@ struct b43legacy_dmaring *b43legacy_setup_dmaring(struct b43legacy_wldev *dev,
DMA_TO_DEVICE);
if (b43legacy_dma_mapping_error(ring, dma_test,
- sizeof(struct b43legacy_txhdr_fw3)))
+ sizeof(struct b43legacy_txhdr_fw3), 1))
goto err_kfree_txhdr_cache;
}
@@ -1235,7 +1242,7 @@ static int dma_tx_fragment(struct b43legacy_dmaring *ring,
meta_hdr->dmaaddr = map_descbuffer(ring, (unsigned char *)header,
sizeof(struct b43legacy_txhdr_fw3), 1);
if (b43legacy_dma_mapping_error(ring, meta_hdr->dmaaddr,
- sizeof(struct b43legacy_txhdr_fw3))) {
+ sizeof(struct b43legacy_txhdr_fw3), 1)) {
ring->current_slot = old_top_slot;
ring->used_slots = old_used_slots;
return -EIO;
@@ -1254,7 +1261,7 @@ static int dma_tx_fragment(struct b43legacy_dmaring *ring,
meta->dmaaddr = map_descbuffer(ring, skb->data, skb->len, 1);
/* create a bounce buffer in zone_dma on mapping failure. */
- if (b43legacy_dma_mapping_error(ring, meta->dmaaddr, skb->len)) {
+ if (b43legacy_dma_mapping_error(ring, meta->dmaaddr, skb->len, 1)) {
bounce_skb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
if (!bounce_skb) {
ring->current_slot = old_top_slot;
@@ -1268,7 +1275,7 @@ static int dma_tx_fragment(struct b43legacy_dmaring *ring,
skb = bounce_skb;
meta->skb = skb;
meta->dmaaddr = map_descbuffer(ring, skb->data, skb->len, 1);
- if (b43legacy_dma_mapping_error(ring, meta->dmaaddr, skb->len)) {
+ if (b43legacy_dma_mapping_error(ring, meta->dmaaddr, skb->len, 1)) {
ring->current_slot = old_top_slot;
ring->used_slots = old_used_slots;
err = -EIO;