linux-kernel - [PATCH v3] staging: mmal-vchiq: add a check for the return of vmalloc()

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Date:   Wed, 16 Mar 2022 00:39:13 +0800
From:   xkernel.wang@...mail.com
To:     gregkh@...uxfoundation.org, dan.carpenter@...cle.com,
        nsaenz@...nel.org
Cc:     bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Xiaoke Wang <xkernel.wang@...mail.com>
Subject: [PATCH v3] staging: mmal-vchiq: add a check for the return of vmalloc()

From: Xiaoke Wang <xkernel.wang@...mail.com>

vmalloc() is a memory allocation API which can return NULL when some
internal memory errors happen. So it is better to check the return
value of it to catch the error in time.

Signed-off-by: Xiaoke Wang <xkernel.wang@...mail.com>
---
ChangeLog:
v1->v2 jump to the proper location and remove redundant instruction.
v2->v3 fix the mistake bring by version 2.
 drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c b/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c
index 76d3f03..24cc0fe 100644
--- a/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c
+++ b/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c
@@ -1909,6 +1909,10 @@ int vchiq_mmal_init(struct vchiq_mmal_instance **out_instance)
 	mutex_init(&instance->vchiq_mutex);
 
 	instance->bulk_scratch = vmalloc(PAGE_SIZE);
+	if (!instance->bulk_scratch) {
+		err = -ENOMEM;
+		goto err_free_instance;
+	}
 	instance->vchiq_instance = vchiq_instance;
 
 	mutex_init(&instance->context_map_lock);
@@ -1940,6 +1944,7 @@ int vchiq_mmal_init(struct vchiq_mmal_instance **out_instance)
 	destroy_workqueue(instance->bulk_wq);
 err_free:
 	vfree(instance->bulk_scratch);
+err_free_instance:
 	kfree(instance);
 err_shutdown_vchiq:
 	vchiq_shutdown(vchiq_instance);
--