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firmware: arm_ffa: Check xa_load() return value

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Add a check to verify the result of xa_load() during the partition
lookups done while registering/unregistering the scheduler receiver
interrupt callbacks and while executing the main scheduler receiver
interrupt callback handler.

Fixes: 0184450b8b ("firmware: arm_ffa: Add schedule receiver callback mechanism")
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Link: https://lore.kernel.org/r/20240108-ffa_fixes_6-8-v1-3-75bf7035bc50@arm.com
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Cristian Marussi 2024-01-08 12:34:13 +00:00 committed by Sudeep Holla
parent 5ff30ade16
commit c00d9738fd
1 changed files with 10 additions and 0 deletions
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10
drivers/firmware/arm_ffa/driver.c
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@ -733,6 +733,11 @@ static void __do_sched_recv_cb(u16 part_id, u16 vcpu, bool is_per_vcpu)
void *cb_data;
partition = xa_load(&drv_info->partition_info, part_id);
if (!partition) {
pr_err("%s: Invalid partition ID 0x%x\n", __func__, part_id);
return;
}
read_lock(&partition->rw_lock);
callback = partition->callback;
cb_data = partition->cb_data;
@ -915,6 +920,11 @@ static int ffa_sched_recv_cb_update(u16 part_id, ffa_sched_recv_cb callback,
return -EOPNOTSUPP;
partition = xa_load(&drv_info->partition_info, part_id);
if (!partition) {
pr_err("%s: Invalid partition ID 0x%x\n", __func__, part_id);
return -EINVAL;
}
write_lock(&partition->rw_lock);
cb_valid = !!partition->callback;