acpi: Reject duplicate handlers for ioctl commands

Reviewed by:	imp
Sponsored by:	Netflix
Differential Revision:	https://reviews.freebsd.org/D54311

This commit is contained in:

John Baldwin

2025-12-26 10:36:38 -05:00

parent 88f8e3c5ab

commit 4eb560faa7

1 changed files with 9 additions and 1 deletions

									
										sys/dev/acpica/acpi.c
									
		+9
		-1
	
												View File
												
				@@ -4203,7 +4203,7 @@ static int				acpi_ioctl_hooks_initted;

				int

				acpi_register_ioctl(u_long cmd, acpi_ioctl_fn fn, void *arg)

				{

				    struct acpi_ioctl_hook	*hp;

				    struct acpi_ioctl_hook *hp, *thp;

				    if ((hp = malloc(sizeof(*hp), M_ACPIDEV, M_NOWAIT)) == NULL)

					return (ENOMEM);

				@@ -4216,6 +4216,14 @@ acpi_register_ioctl(u_long cmd, acpi_ioctl_fn fn, void *arg)

					TAILQ_INIT(&acpi_ioctl_hooks);

					acpi_ioctl_hooks_initted = 1;

				    }

				    TAILQ_FOREACH(thp, &acpi_ioctl_hooks, link) {

					if (thp->cmd == cmd) {

					    ACPI_UNLOCK(acpi);

					    free(hp, M_ACPIDEV);

					    return (EBUSY);

					}

				    }

				    TAILQ_INSERT_TAIL(&acpi_ioctl_hooks, hp, link);

				    ACPI_UNLOCK(acpi);