6.11-stable review patch. If anyone has any objections, please let me know.
------------------
From: Ma Ke make24@iscas.ac.cn
commit 62c5a01a5711c8e4be8ae7b6f0db663094615d48 upstream.
In parport_attach, the return value of ida_alloc is unchecked, witch leads to the use of an invalid index value.
To address this issue, index should be checked. When the index value is abnormal, the device should be freed.
Found by code review, compile tested only.
Cc: stable@vger.kernel.org Fixes: fb56d97df70e ("pps: client: use new parport device model") Signed-off-by: Ma Ke make24@iscas.ac.cn Acked-by: Rodolfo Giometti giometti@enneenne.com Link: https://lore.kernel.org/r/20240828131814.3034338-1-make24@iscas.ac.cn Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/pps/clients/pps_parport.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
--- a/drivers/pps/clients/pps_parport.c +++ b/drivers/pps/clients/pps_parport.c @@ -149,6 +149,9 @@ static void parport_attach(struct parpor }
index = ida_alloc(&pps_client_index, GFP_KERNEL); + if (index < 0) + goto err_free_device; + memset(&pps_client_cb, 0, sizeof(pps_client_cb)); pps_client_cb.private = device; pps_client_cb.irq_func = parport_irq; @@ -159,7 +162,7 @@ static void parport_attach(struct parpor index); if (!device->pardev) { pr_err("couldn't register with %s\n", port->name); - goto err_free; + goto err_free_ida; }
if (parport_claim_or_block(device->pardev) < 0) { @@ -187,8 +190,9 @@ err_release_dev: parport_release(device->pardev); err_unregister_dev: parport_unregister_device(device->pardev); -err_free: +err_free_ida: ida_free(&pps_client_index, index); +err_free_device: kfree(device); }