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nvmet: fix dsm failure when payload does not match sgl descriptor 

The host is allowed to pass the controller an sgl describing a buffer
that is larger than the dsm payload itself, allow it when executing
dsm.

Reported-by: Dakshaja Uppalapati <dakshaja@chelsio.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>,
Reviewed-by: Max Gurtovoy <maxg@mellanox.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Keith Busch <kbusch@kernel.org>
This commit is contained in:
Sagi Grimberg 2020-01-26 23:23:28 -08:00 committed by Keith Busch
parent 4ac76436a6
commit b716e6889c
4 changed files with 14 additions and 2 deletions
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11
drivers/nvme/target/core.c
View File

@ -939,6 +939,17 @@ bool nvmet_check_data_len(struct nvmet_req *req, size_t data_len)
}
EXPORT_SYMBOL_GPL(nvmet_check_data_len);
bool nvmet_check_data_len_lte(struct nvmet_req *req, size_t data_len)
{
if (unlikely(data_len > req->transfer_len)) {
req->error_loc = offsetof(struct nvme_common_command, dptr);
nvmet_req_complete(req, NVME_SC_SGL_INVALID_DATA | NVME_SC_DNR);
return false;
}
return true;
}
int nvmet_req_alloc_sgl(struct nvmet_req *req)
{
struct pci_dev *p2p_dev = NULL;

2
drivers/nvme/target/io-cmd-bdev.c
View File

@ -280,7 +280,7 @@ static void nvmet_bdev_execute_discard(struct nvmet_req *req)
static void nvmet_bdev_execute_dsm(struct nvmet_req *req)
{
if (!nvmet_check_data_len(req, nvmet_dsm_len(req)))
if (!nvmet_check_data_len_lte(req, nvmet_dsm_len(req)))
return;
switch (le32_to_cpu(req->cmd->dsm.attributes)) {

2
drivers/nvme/target/io-cmd-file.c
View File

@ -336,7 +336,7 @@ static void nvmet_file_dsm_work(struct work_struct *w)
static void nvmet_file_execute_dsm(struct nvmet_req *req)
{
if (!nvmet_check_data_len(req, nvmet_dsm_len(req)))
if (!nvmet_check_data_len_lte(req, nvmet_dsm_len(req)))
return;
INIT_WORK(&req->f.work, nvmet_file_dsm_work);
schedule_work(&req->f.work);

1
drivers/nvme/target/nvmet.h
View File

@ -374,6 +374,7 @@ bool nvmet_req_init(struct nvmet_req *req, struct nvmet_cq *cq,
struct nvmet_sq *sq, const struct nvmet_fabrics_ops *ops);
void nvmet_req_uninit(struct nvmet_req *req);
bool nvmet_check_data_len(struct nvmet_req *req, size_t data_len);
bool nvmet_check_data_len_lte(struct nvmet_req *req, size_t data_len);
void nvmet_req_complete(struct nvmet_req *req, u16 status);
int nvmet_req_alloc_sgl(struct nvmet_req *req);
void nvmet_req_free_sgl(struct nvmet_req *req);