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| author | Mikulas Patocka <mpatocka@redhat.com> | 2024-01-09 17:57:56 +0300 |
|---|---|---|
| committer | Mike Snitzer <snitzer@kernel.org> | 2024-01-30 22:05:02 +0300 |
| commit | bd504bcfec41a503b32054da5472904b404341a4 (patch) | |
| tree | cb99fb5518b4b0a663750dd6559073299a2c8070 /drivers/md/dm-ioctl.c | |
| parent | 41bccc98fb7931d63d03f326a746ac4d429c1dd3 (diff) | |
| download | linux-bd504bcfec41a503b32054da5472904b404341a4.tar.xz | |
dm: limit the number of targets and parameter size area
The kvmalloc function fails with a warning if the size is larger than
INT_MAX. The warning was triggered by a syscall testing robot.
In order to avoid the warning, this commit limits the number of targets to
1048576 and the size of the parameter area to 1073741824.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Diffstat (limited to 'drivers/md/dm-ioctl.c')
| -rw-r--r-- | drivers/md/dm-ioctl.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c index e65058e0ed06..3b1ad7127cb8 100644 --- a/drivers/md/dm-ioctl.c +++ b/drivers/md/dm-ioctl.c @@ -1941,7 +1941,8 @@ static int copy_params(struct dm_ioctl __user *user, struct dm_ioctl *param_kern minimum_data_size - sizeof(param_kernel->version))) return -EFAULT; - if (param_kernel->data_size < minimum_data_size) { + if (unlikely(param_kernel->data_size < minimum_data_size) || + unlikely(param_kernel->data_size > DM_MAX_TARGETS * DM_MAX_TARGET_PARAMS)) { DMERR("Invalid data size in the ioctl structure: %u", param_kernel->data_size); return -EINVAL; |