The VM_BIND ioctl did not validate args->num_syncs, allowing userspace to pass excessively large values that could lead to oversized allocations or other unexpected behavior.
Add a check to ensure num_syncs does not exceed XE_MAX_SYNCS, returning -EINVAL when the limit is violated.
Fixes: dd08ebf6c352 ("drm/xe: Introduce a new DRM driver for Intel GPUs") Cc: stable@vger.kernel.org # v6.12+ Cc: Matthew Brost matthew.brost@intel.com Cc: Michal Mrozek michal.mrozek@intel.com Cc: Carl Zhang carl.zhang@intel.com Cc: José Roberto de Souza jose.souza@intel.com Cc: Lionel Landwerlin lionel.g.landwerlin@intel.com Cc: Ivan Briano ivan.briano@intel.com Cc: Thomas Hellström thomas.hellstrom@linux.intel.com Cc: Ashutosh Dixit ashutosh.dixit@intel.com Signed-off-by: Shuicheng Lin shuicheng.lin@intel.com --- drivers/gpu/drm/xe/xe_vm.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/xe/xe_vm.c b/drivers/gpu/drm/xe/xe_vm.c index c2012d20faa6..2ada14ed1f3c 100644 --- a/drivers/gpu/drm/xe/xe_vm.c +++ b/drivers/gpu/drm/xe/xe_vm.c @@ -3341,6 +3341,9 @@ static int vm_bind_ioctl_check_args(struct xe_device *xe, struct xe_vm *vm, if (XE_IOCTL_DBG(xe, args->extensions)) return -EINVAL;
+ if (XE_IOCTL_DBG(xe, args->num_syncs > XE_MAX_SYNCS)) + return -EINVAL; + if (args->num_binds > 1) { u64 __user *bind_user = u64_to_user_ptr(args->vector_of_binds);