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authorMa Ke <make24@iscas.ac.cn>2024-08-28 16:18:14 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2024-09-03 13:33:09 +0300
commit62c5a01a5711c8e4be8ae7b6f0db663094615d48 (patch)
tree10c769a243c217c739fd781f50f8a4305a2fbbcb /drivers/pps
parent43027957e87fe18afd9ab872915bf4012d53929d (diff)
downloadlinux-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/pps')
-rw-r--r--drivers/pps/clients/pps_parport.c8
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);
}