On Wed, Jan 29, 2014, Dan Carpenter <dan.carpenter@xxxxxxxxxx> wrote:
> We use "tx_desc" again after we free it.
yep, this is legacy code which isn't much of use over the last years
and hence the bug went in unnoticed
> Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
>
> diff --git a/drivers/infiniband/ulp/iser/iser_initiator.c b/drivers/infiniband/ulp/iser/iser_initiator.c
> index 538822684d5b..334f34b1cd46 100644
> --- a/drivers/infiniband/ulp/iser/iser_initiator.c
> +++ b/drivers/infiniband/ulp/iser/iser_initiator.c
> @@ -610,11 +610,12 @@ void iser_snd_completion(struct iser_tx_desc *tx_desc,
> ib_dma_unmap_single(device->ib_device, tx_desc->dma_addr,
> ISER_HEADERS_LEN, DMA_TO_DEVICE);
> kmem_cache_free(ig.desc_cache, tx_desc);
> + tx_desc = NULL;
> }
>
> atomic_dec(&ib_conn->post_send_buf_count);
>
> - if (tx_desc->type == ISCSI_TX_CONTROL) {
> + if (tx_desc && tx_desc->type == ISCSI_TX_CONTROL) {
> /* this arithmetic is legal by libiscsi dd_data allocation */
> task = (void *) ((long)(void *)tx_desc -
> sizeof(struct iscsi_task));
> --
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