diff options
Diffstat (limited to 'drivers/android/binder.c')
-rw-r--r-- | drivers/android/binder.c | 28 |
1 files changed, 25 insertions, 3 deletions
diff --git a/drivers/android/binder.c b/drivers/android/binder.c index 1c5278207153..4fe23f28514e 100644 --- a/drivers/android/binder.c +++ b/drivers/android/binder.c @@ -3002,6 +3002,12 @@ static void binder_transaction(struct binder_proc *proc, goto err_dead_binder; } e->to_node = target_node->debug_id; + if (WARN_ON(proc == target_proc)) { + return_error = BR_FAILED_REPLY; + return_error_param = -EINVAL; + return_error_line = __LINE__; + goto err_invalid_target_handle; + } if (security_binder_transaction(proc->tsk, target_proc->tsk) < 0) { return_error = BR_FAILED_REPLY; @@ -3332,7 +3338,7 @@ static void binder_transaction(struct binder_proc *proc, binder_size_t parent_offset; struct binder_fd_array_object *fda = to_binder_fd_array_object(hdr); - size_t num_valid = (buffer_offset - off_start_offset) * + size_t num_valid = (buffer_offset - off_start_offset) / sizeof(binder_size_t); struct binder_buffer_object *parent = binder_validate_ptr(target_proc, t->buffer, @@ -3406,7 +3412,7 @@ static void binder_transaction(struct binder_proc *proc, t->buffer->user_data + sg_buf_offset; sg_buf_offset += ALIGN(bp->length, sizeof(u64)); - num_valid = (buffer_offset - off_start_offset) * + num_valid = (buffer_offset - off_start_offset) / sizeof(binder_size_t); ret = binder_fixup_parent(t, thread, bp, off_start_offset, @@ -3655,10 +3661,17 @@ static int binder_thread_write(struct binder_proc *proc, struct binder_node *ctx_mgr_node; mutex_lock(&context->context_mgr_node_lock); ctx_mgr_node = context->binder_context_mgr_node; - if (ctx_mgr_node) + if (ctx_mgr_node) { + if (ctx_mgr_node->proc == proc) { + binder_user_error("%d:%d context manager tried to acquire desc 0\n", + proc->pid, thread->pid); + mutex_unlock(&context->context_mgr_node_lock); + return -EINVAL; + } ret = binder_inc_ref_for_node( proc, ctx_mgr_node, strong, NULL, &rdata); + } mutex_unlock(&context->context_mgr_node_lock); } if (ret) @@ -4706,8 +4719,15 @@ static struct binder_thread *binder_get_thread(struct binder_proc *proc) static void binder_free_proc(struct binder_proc *proc) { + struct binder_device *device; + BUG_ON(!list_empty(&proc->todo)); BUG_ON(!list_empty(&proc->delivered_death)); + device = container_of(proc->context, struct binder_device, context); + if (refcount_dec_and_test(&device->ref)) { + kfree(proc->context->name); + kfree(device); + } binder_alloc_deferred_release(&proc->alloc); put_task_struct(proc->tsk); binder_stats_deleted(BINDER_STAT_PROC); @@ -5242,6 +5262,7 @@ static int binder_open(struct inode *nodp, struct file *filp) else binder_dev = container_of(filp->private_data, struct binder_device, miscdev); + refcount_inc(&binder_dev->ref); proc->context = &binder_dev->context; binder_alloc_init(&proc->alloc); @@ -6061,6 +6082,7 @@ static int __init init_binder_device(const char *name) binder_device->miscdev.minor = MISC_DYNAMIC_MINOR; binder_device->miscdev.name = name; + refcount_set(&binder_device->ref, 1); binder_device->context.binder_context_mgr_uid = INVALID_UID; binder_device->context.name = name; mutex_init(&binder_device->context.context_mgr_node_lock); |