On Fri, 2012-09-07 at 17:30 +0200, Paolo Bonzini wrote:
> Several places were not checking that the parameter list length
> was large enough, and thus accessing invalid memory. Zero-length
> parameter lists are just a special case of this.
>
> Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
> ---
So I think this looks like reasonable for-3.6 material as well.
Roland, do you have any objections to this..?
> drivers/target/target_core_alua.c | 7 +++++++
> drivers/target/target_core_iblock.c | 17 +++++++++++++++--
> drivers/target/target_core_pr.c | 8 ++++++++
> 3 files changed, 30 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/target/target_core_alua.c
> b/drivers/target/target_core_alua.c
> index 9179997..41641ba 100644
> --- a/drivers/target/target_core_alua.c
> +++ b/drivers/target/target_core_alua.c
> @@ -218,6 +218,13 @@ int target_emulate_set_target_port_groups(struct se_cmd
> *cmd)
> cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
> return -EINVAL;
> }
> + if (cmd->data_length < 4) {
> + pr_warn("SET TARGET PORT GROUPS parameter list length %u too"
> + " small\n", cmd->data_length);
> + cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
> + return -EINVAL;
> + }
> +
> buf = transport_kmap_data_sg(cmd);
>
> /*
> diff --git a/drivers/target/target_core_iblock.c
> b/drivers/target/target_core_iblock.c
> index 76db75e..9ba4954 100644
> --- a/drivers/target/target_core_iblock.c
> +++ b/drivers/target/target_core_iblock.c
> @@ -325,17 +325,30 @@ static int iblock_execute_unmap(struct se_cmd *cmd)
> struct iblock_dev *ibd = dev->dev_ptr;
> unsigned char *buf, *ptr = NULL;
> sector_t lba;
> - int size = cmd->data_length;
> + int size;
> u32 range;
> int ret = 0;
> int dl, bd_dl;
>
> + if (cmd->data_length < 8) {
> + pr_warn("UNMAP parameter list length %u too small\n",
> + cmd->data_length);
> + cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
> + return -EINVAL;
> + }
> +
> buf = transport_kmap_data_sg(cmd);
>
> dl = get_unaligned_be16(&buf[0]);
> bd_dl = get_unaligned_be16(&buf[2]);
>
> - size = min(size - 8, bd_dl);
> + size = cmd->data_length - 8;
> + if (bd_dl > size)
> + pr_warn("UNMAP parameter list length %u too small, ignoring
> bd_dl %u\n",
> + cmd->data_length, bd_dl);
> + else
> + size = bd_dl;
> +
> if (size / 16 >
> dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
> cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
> ret = -EINVAL;
> diff --git a/drivers/target/target_core_pr.c b/drivers/target/target_core_pr.c
> index 1e94650..956c84c 100644
> --- a/drivers/target/target_core_pr.c
> +++ b/drivers/target/target_core_pr.c
> @@ -1540,6 +1540,14 @@ static int core_scsi3_decode_spec_i_port(
> tidh_new->dest_local_nexus = 1;
> list_add_tail(&tidh_new->dest_list, &tid_dest_list);
>
> + if (cmd->data_length < 28) {
> + pr_warn("SPC-PR: Received PR OUT parameter list"
> + " length too small: %u\n", cmd->data_length);
> + cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
> + ret = -EINVAL;
> + goto out;
> + }
> +
> buf = transport_kmap_data_sg(cmd);
> /*
> * For a PERSISTENT RESERVE OUT specify initiator ports payload,
--
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