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Staging: binder: Prevent the wrong thread from adding a transaction to the stack.

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If a thread is part of a transaction stack, it is only allowed to make
another call if it was the target of the top transaction on the stack.

Signed-off-by: Arve Hjønnevåg <arve@android.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Arve Hjønnevåg 2009-04-06 15:12:59 -07:00 committed by Greg Kroah-Hartman
parent 7af7467efa
commit 0cf24a7dc9
1 changed files with 11 additions and 0 deletions
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11
drivers/staging/android/binder.c
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@ -1343,6 +1343,17 @@ binder_transaction(struct binder_proc *proc, struct binder_thread *thread,
if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) { if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
struct binder_transaction *tmp; struct binder_transaction *tmp;
tmp = thread->transaction_stack; tmp = thread->transaction_stack;
if (tmp->to_thread != thread) {
binder_user_error("binder: %d:%d got new "
"transaction with bad transaction stack"
", transaction %d has target %d:%d\n",
proc->pid, thread->pid, tmp->debug_id,
tmp->to_proc ? tmp->to_proc->pid : 0,
tmp->to_thread ?
tmp->to_thread->pid : 0);
return_error = BR_FAILED_REPLY;
goto err_bad_call_stack;
}
while (tmp) { while (tmp) {
if (tmp->from && tmp->from->proc == target_proc) if (tmp->from && tmp->from->proc == target_proc)
target_thread = tmp->from; target_thread = tmp->from;