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R. Silva" , linux-kernel@vger.kernel.org (open list), linux-hardening@vger.kernel.org (open list:KERNEL HARDENING (not covered by other areas):Keyword:\b__counted_by(_le|_be)?\b) Subject: [PATCH] media: dvb_ca_en50221: simplify ca allocation Date: Mon, 6 Apr 2026 18:01:40 -0700 Message-ID: <20260407010140.3229-1-rosenp@gmail.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-hardening@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Use a flexible array member to combine allocations and simplify memory handling slightly. Add __counted_by for extra runtime analysis. Move counting variable assignment after allocation as done by kzalloc_flex for GCC >= 15. Signed-off-by: Rosen Penev --- drivers/media/dvb-core/dvb_ca_en50221.c | 20 ++++++-------------- 1 file changed, 6 insertions(+), 14 deletions(-) diff --git a/drivers/media/dvb-core/dvb_ca_en50221.c b/drivers/media/dvb-core/dvb_ca_en50221.c index 1b91ebb8f667..a792feb076ef 100644 --- a/drivers/media/dvb-core/dvb_ca_en50221.c +++ b/drivers/media/dvb-core/dvb_ca_en50221.c @@ -125,9 +125,6 @@ struct dvb_ca_private { /* number of slots supported by this CA interface */ unsigned int slot_count; - /* information on each slot */ - struct dvb_ca_slot *slot_info; - /* wait queues for read() and write() operations */ wait_queue_head_t wait_queue; @@ -157,6 +154,9 @@ struct dvb_ca_private { /* Whether the device is disconnected */ int exit; + + /* information on each slot */ + struct dvb_ca_slot slot_info[] __counted_by(slot_count); }; static void dvb_ca_private_free(struct dvb_ca_private *ca) @@ -167,7 +167,6 @@ static void dvb_ca_private_free(struct dvb_ca_private *ca) for (i = 0; i < ca->slot_count; i++) vfree(ca->slot_info[i].rx_buffer.data); - kfree(ca->slot_info); kfree(ca); } @@ -1880,20 +1879,15 @@ int dvb_ca_en50221_init(struct dvb_adapter *dvb_adapter, return -EINVAL; /* initialise the system data */ - ca = kzalloc_obj(*ca); + ca = kzalloc_flex(*ca, slot_info, slot_count); if (!ca) { ret = -ENOMEM; goto exit; } + ca->slot_count = slot_count; kref_init(&ca->refcount); ca->pub = pubca; ca->flags = flags; - ca->slot_count = slot_count; - ca->slot_info = kzalloc_objs(struct dvb_ca_slot, slot_count); - if (!ca->slot_info) { - ret = -ENOMEM; - goto free_ca; - } init_waitqueue_head(&ca->wait_queue); ca->open = 0; ca->wakeup = 0; @@ -1904,7 +1898,7 @@ int dvb_ca_en50221_init(struct dvb_adapter *dvb_adapter, ret = dvb_register_device(dvb_adapter, &ca->dvbdev, &dvbdev_ca, ca, DVB_DEVICE_CA, 0); if (ret) - goto free_slot_info; + goto free_ca; /* now initialise each slot */ for (i = 0; i < slot_count; i++) { @@ -1939,8 +1933,6 @@ int dvb_ca_en50221_init(struct dvb_adapter *dvb_adapter, unregister_device: dvb_unregister_device(ca->dvbdev); -free_slot_info: - kfree(ca->slot_info); free_ca: kfree(ca); exit: -- 2.53.0