diff options
| author | Ma Ke <make24@iscas.ac.cn> | 2024-08-28 16:18:14 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-09-03 13:33:09 +0300 |
| commit | 62c5a01a5711c8e4be8ae7b6f0db663094615d48 (patch) | |
| tree | 10c769a243c217c739fd781f50f8a4305a2fbbcb /drivers | |
| parent | 43027957e87fe18afd9ab872915bf4012d53929d (diff) | |
| download | linux-62c5a01a5711c8e4be8ae7b6f0db663094615d48.tar.xz | |
pps: add an error check in parport_attach
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/pps/clients/pps_parport.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/pps/clients/pps_parport.c b/drivers/pps/clients/pps_parport.c index 63d03a0df5cc..abaffb4e1c1c 100644 --- a/drivers/pps/clients/pps_parport.c +++ b/drivers/pps/clients/pps_parport.c @@ -149,6 +149,9 @@ static void parport_attach(struct parport *port) } 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 parport *port) 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); } |