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nvme: reject invalid pr_read_keys() num_keys values

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The pr_read_keys() interface has a u32 num_keys parameter. The NVMe
Reservation Report command has a u32 maximum length. Reject num_keys
values that are too large to fit.

This will become important when pr_read_keys() is exposed to untrusted
userspace via an <linux/pr.h> ioctl.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Stefan Hajnoczi
2025-12-01 16:43:27 -05:00
committed by Jens Axboe
parent ab4fb1d8f6
commit 38ec8469f3
1 changed files with 5 additions and 1 deletions
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6
drivers/nvme/host/pr.c
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@@ -228,7 +228,8 @@ retry:
static int nvme_pr_read_keys(struct block_device *bdev,
struct pr_keys *keys_info)
{
u32 rse_len, num_keys = keys_info->num_keys;
size_t rse_len;
u32 num_keys = keys_info->num_keys;
struct nvme_reservation_status_ext *rse;
int ret, i;
bool eds;
@@ -238,6 +239,9 @@ static int nvme_pr_read_keys(struct block_device *bdev,
* enough to get enough keys to fill the return keys buffer.
*/
rse_len = struct_size(rse, regctl_eds, num_keys);
if (rse_len > U32_MAX)
return -EINVAL;
rse = kzalloc(rse_len, GFP_KERNEL);
if (!rse)
return -ENOMEM;