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b43: Fix DMA mapping leakage 

This fixes a DMA mapping leakage in the case where we reject a DMA
buffer because of its address.

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Cc: Christian Casteyde <casteyde.christian@free.fr>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Michael Buesch 2008-03-22 22:04:45 +01:00 committed by John W. Linville
parent c83dbf687f
commit ffa9256aaa
1 changed files with 17 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
drivers/net/wireless/b43/dma.c
View File

@ -560,7 +560,7 @@ static int b43_dmacontroller_tx_reset(struct b43_wldev *dev, u16 mmio_base,
/* Check if a DMA mapping address is invalid. */
static bool b43_dma_mapping_error(struct b43_dmaring *ring,
dma_addr_t addr,
size_t buffersize)
size_t buffersize, bool dma_to_device)
{
if (unlikely(dma_mapping_error(addr)))
return 1;
@ -568,11 +568,11 @@ static bool b43_dma_mapping_error(struct b43_dmaring *ring,
switch (ring->type) {
case B43_DMA_30BIT:
if ((u64)addr + buffersize > (1ULL << 30))
return 1;
goto address_error;
break;
case B43_DMA_32BIT:
if ((u64)addr + buffersize > (1ULL << 32))
return 1;
goto address_error;
break;
case B43_DMA_64BIT:
/* Currently we can't have addresses beyond
@ -582,6 +582,12 @@ static bool b43_dma_mapping_error(struct b43_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 b43_dmaring *ring,
@ -599,7 +605,7 @@ static int setup_rx_descbuffer(struct b43_dmaring *ring,
if (unlikely(!skb))
return -ENOMEM;
dmaaddr = map_descbuffer(ring, skb->data, ring->rx_buffersize, 0);
if (b43_dma_mapping_error(ring, dmaaddr, ring->rx_buffersize)) {
if (b43_dma_mapping_error(ring, dmaaddr, ring->rx_buffersize, 0)) {
/* ugh. try to realloc in zone_dma */
gfp_flags |= GFP_DMA;
@ -612,7 +618,7 @@ static int setup_rx_descbuffer(struct b43_dmaring *ring,
ring->rx_buffersize, 0);
}
if (b43_dma_mapping_error(ring, dmaaddr, ring->rx_buffersize)) {
if (b43_dma_mapping_error(ring, dmaaddr, ring->rx_buffersize, 0)) {
dev_kfree_skb_any(skb);
return -EIO;
}
@ -852,7 +858,8 @@ struct b43_dmaring *b43_setup_dmaring(struct b43_wldev *dev,
b43_txhdr_size(dev),
DMA_TO_DEVICE);
if (b43_dma_mapping_error(ring, dma_test, b43_txhdr_size(dev))) {
if (b43_dma_mapping_error(ring, dma_test,
b43_txhdr_size(dev), 1)) {
/* ugh realloc */
kfree(ring->txhdr_cache);
ring->txhdr_cache = kcalloc(nr_slots,
@ -867,7 +874,7 @@ struct b43_dmaring *b43_setup_dmaring(struct b43_wldev *dev,
DMA_TO_DEVICE);
if (b43_dma_mapping_error(ring, dma_test,
b43_txhdr_size(dev)))
b43_txhdr_size(dev), 1))
goto err_kfree_txhdr_cache;
}
@ -1189,7 +1196,7 @@ static int dma_tx_fragment(struct b43_dmaring *ring,
meta_hdr->dmaaddr = map_descbuffer(ring, (unsigned char *)header,
hdrsize, 1);
if (b43_dma_mapping_error(ring, meta_hdr->dmaaddr, hdrsize)) {
if (b43_dma_mapping_error(ring, meta_hdr->dmaaddr, hdrsize, 1)) {
ring->current_slot = old_top_slot;
ring->used_slots = old_used_slots;
return -EIO;
@ -1208,7 +1215,7 @@ static int dma_tx_fragment(struct b43_dmaring *ring,
meta->dmaaddr = map_descbuffer(ring, skb->data, skb->len, 1);
/* create a bounce buffer in zone_dma on mapping failure. */
if (b43_dma_mapping_error(ring, meta->dmaaddr, skb->len)) {
if (b43_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;
@ -1222,7 +1229,7 @@ static int dma_tx_fragment(struct b43_dmaring *ring,
skb = bounce_skb;
meta->skb = skb;
meta->dmaaddr = map_descbuffer(ring, skb->data, skb->len, 1);
if (b43_dma_mapping_error(ring, meta->dmaaddr, skb->len)) {
if (b43_dma_mapping_error(ring, meta->dmaaddr, skb->len, 1)) {
ring->current_slot = old_top_slot;
ring->used_slots = old_used_slots;
err = -EIO;