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nvme: Fix parsing of ANA log page 

Check validity of offset into ANA log buffer before accessing
nvme_ana_group_desc. This check ensures the size of ANA log buffer >=
offset + sizeof(nvme_ana_group_desc)

Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Prabhath Sajeepa <psajeepa@purestorage.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Prabhath Sajeepa 2019-10-28 16:56:48 -06:00 committed by Jens Axboe
parent 716fd9c119
commit 64fab7290d
1 changed files with 8 additions and 4 deletions
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12
drivers/nvme/host/multipath.c
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@ -445,8 +445,14 @@ static int nvme_parse_ana_log(struct nvme_ctrl *ctrl, void *data,
for (i = 0; i < le16_to_cpu(ctrl->ana_log_buf->ngrps); i++) {
struct nvme_ana_group_desc *desc = base + offset;
u32 nr_nsids = le32_to_cpu(desc->nnsids);
size_t nsid_buf_size = nr_nsids * sizeof(__le32);
u32 nr_nsids;
size_t nsid_buf_size;
if (WARN_ON_ONCE(offset > ctrl->ana_log_size - sizeof(*desc)))
return -EINVAL;
nr_nsids = le32_to_cpu(desc->nnsids);
nsid_buf_size = nr_nsids * sizeof(__le32);
if (WARN_ON_ONCE(desc->grpid == 0))
return -EINVAL;
@ -466,8 +472,6 @@ static int nvme_parse_ana_log(struct nvme_ctrl *ctrl, void *data,
return error;
offset += nsid_buf_size;
if (WARN_ON_ONCE(offset > ctrl->ana_log_size - sizeof(*desc)))
return -EINVAL;
}
return 0;