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Merge "msm: kgsl: Correct the refcount on current process PID"

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qctecmdr 2020-12-22 07:07:15 -08:00 • committed by Gerrit - the friendly Code Review server
commit d42c44476e
1 changed files with 9 additions and 2 deletions
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11
drivers/gpu/msm/kgsl.c
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@ -890,17 +890,24 @@ static struct kgsl_process_private *kgsl_process_private_new(
list_for_each_entry(private, &kgsl_driver.process_list, list) {
if (private->pid == cur_pid) {
if (!kgsl_process_private_get(private)) {
put_pid(cur_pid);
private = ERR_PTR(-EINVAL);
}
/*
* We need to hold only one reference to the PID for
* each process struct to avoid overflowing the
* reference counter which can lead to use-after-free.
*/
put_pid(cur_pid);
return private;
}
}
/* Create a new object */
private = kzalloc(sizeof(struct kgsl_process_private), GFP_KERNEL);
if (private == NULL)
if (private == NULL) {
put_pid(cur_pid);
return ERR_PTR(-ENOMEM);
}
kref_init(&private->refcount);