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firewire: sbp2: fix DMA mapping leak on the failure path 

Reported-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
who also provided a first version of the fix.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Stefan Richter 2009-01-28 01:03:34 +01:00
parent f746072abc
commit 5e2125677f
1 changed files with 17 additions and 10 deletions
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27
drivers/firewire/fw-sbp2.c
View File

@ -1284,6 +1284,19 @@ static struct fw_driver sbp2_driver = {
.id_table = sbp2_id_table,
};
static void sbp2_unmap_scatterlist(struct device *card_device,
struct sbp2_command_orb *orb)
{
if (scsi_sg_count(orb->cmd))
dma_unmap_sg(card_device, scsi_sglist(orb->cmd),
scsi_sg_count(orb->cmd),
orb->cmd->sc_data_direction);
if (orb->request.misc & cpu_to_be32(COMMAND_ORB_PAGE_TABLE_PRESENT))
dma_unmap_single(card_device, orb->page_table_bus,
sizeof(orb->page_table), DMA_TO_DEVICE);
}
static unsigned int
sbp2_status_to_sense_data(u8 *sbp2_status, u8 *sense_data)
{
@ -1363,15 +1376,7 @@ complete_command_orb(struct sbp2_orb *base_orb, struct sbp2_status *status)
dma_unmap_single(device->card->device, orb->base.request_bus,
sizeof(orb->request), DMA_TO_DEVICE);
if (scsi_sg_count(orb->cmd) > 0)
dma_unmap_sg(device->card->device, scsi_sglist(orb->cmd),
scsi_sg_count(orb->cmd),
orb->cmd->sc_data_direction);
if (orb->page_table_bus != 0)
dma_unmap_single(device->card->device, orb->page_table_bus,
sizeof(orb->page_table), DMA_TO_DEVICE);
sbp2_unmap_scatterlist(device->card->device, orb);
orb->cmd->result = result;
orb->done(orb->cmd);
@ -1493,8 +1498,10 @@ static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done)
orb->base.request_bus =
dma_map_single(device->card->device, &orb->request,
sizeof(orb->request), DMA_TO_DEVICE);
if (dma_mapping_error(device->card->device, orb->base.request_bus))
if (dma_mapping_error(device->card->device, orb->base.request_bus)) {
sbp2_unmap_scatterlist(device->card->device, orb);
goto out;
}
sbp2_send_orb(&orb->base, lu, lu->tgt->node_id, generation,
lu->command_block_agent_address + SBP2_ORB_POINTER);