[RFC v4 2/5] eal/freebsd: fix a FD leak in the alarm subsystem

[Bruce Richardson]

On Tue, Sep 08, 2026 at 09:38:31AM +0200, David Marchand wrote:
> Caught by code review, while looking at rte_intr_instance_free() users.
> 
> Even if the FD is not used, it must still be closed when uninitialising
> the alarm subsystem.
> 
> Fixes: 26021a715067 ("eal/bsd: support alarm API")
> Cc: stable at dpdk.org
> 
> Signed-off-by: David Marchand <david.marchand at redhat.com>
Acked-by: Bruce Richardson <bruce.richardson at intel.com>
> ---
> Changes since RFC v3:
> - fixed compilation,
> 
> ---
>  lib/eal/freebsd/eal_alarm.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/lib/eal/freebsd/eal_alarm.c b/lib/eal/freebsd/eal_alarm.c
> index c03e281e67..8544fe8d03 100644
> --- a/lib/eal/freebsd/eal_alarm.c
> +++ b/lib/eal/freebsd/eal_alarm.c
> @@ -10,6 +10,7 @@
>  #include <stdlib.h>
>  #include <string.h>
>  #include <time.h>
> +#include <unistd.h>
>  #include <errno.h>
>  
>  #include <eal_export.h>
> @@ -54,6 +55,8 @@ rte_eal_alarm_cleanup(void)
>  	int ret = rte_intr_callback_unregister_sync(intr_handle,
>  			eal_alarm_callback, (void *)-1);
>  	if (ret >= 0) {
> +		close(rte_intr_fd_get(intr_handle));
> +		rte_intr_fd_set(intr_handle, -1);
>  		rte_intr_instance_free(intr_handle);
>  		intr_handle = NULL;
>  	}
> @@ -62,7 +65,7 @@ rte_eal_alarm_cleanup(void)
>  int
>  rte_eal_alarm_init(void)
>  {
> -	int fd;
> +	int fd = -1;
>  
>  	intr_handle = rte_intr_instance_alloc(RTE_INTR_INSTANCE_F_PRIVATE);
>  	if (intr_handle == NULL) {
> @@ -88,6 +91,8 @@ rte_eal_alarm_init(void)
>  
>  	return 0;
>  error:
> +	if (fd >= 0)
> +		close(fd);
>  	rte_intr_instance_free(intr_handle);
>  	return -1;
>  }
> -- 
> 2.54.0
>