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Fri, 16 Nov 2018 06:39:54 -0800 (PST) X-Google-Smtp-Source: AFSGD/XjyVsHsmDi+oKxMsFZ/hLG36TQdg1uDC2wO1upiuvyI+72rZz3AeAffzu3LWvkW8xxAI1e0w== X-Received: by 2002:a1c:1cc4:: with SMTP id c187-v6mr2937565wmc.75.1542379194454; Fri, 16 Nov 2018 06:39:54 -0800 (PST) Received: from jamesh-VirtualBox.pitowers.org ([2a00:2381:fdf7:14:4419:8784:6076:3820]) by smtp.gmail.com with ESMTPSA id a7sm26247594wrx.26.2018.11.16.06.39.53 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 16 Nov 2018 06:39:53 -0800 (PST) From: James Hughes To: eric@anholt.net, stefan.wahren@i2se.com, linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v3] firmware: raspberrypi: Fix firmware calls with large buffers Date: Fri, 16 Nov 2018 14:39:07 +0000 Message-Id: <20181116143907.6149-1-james.hughes@raspberrypi.org> X-Mailer: git-send-email 2.17.1 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2018-11-16_09:, , signatures=0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20181116_144007_971248_9AC931E8 X-CRM114-Status: GOOD ( 21.12 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: James Hughes MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Commit a1547e0bca51 ("firmware: raspberrypi: Remove VLA usage") moved away from VLA's to a fixed maximum size for mailbox data. However, some mailbox calls use larger data buffers than the maximum allowed in that change. This fix therefor moves from using fixed buffers to kmalloc to ensure all sizes are catered for. There is some documentation, which is somewhat out of date, on the mailbox calls here : https://github.com/raspberrypi/firmware/wiki/Mailbox-property-interface Fixes: a1547e0bca51 ("firmware: raspberrypi: Remove VLA usage") Signed-off-by: James Hughes Reviewed-by: Eric Anholt --- drivers/firmware/raspberrypi.c | 35 +++++++++++++++++----------------- 1 file changed, 18 insertions(+), 17 deletions(-) v2: Changes to commit message and format only. No code change. v3: Moved declaration of header back to original position diff --git a/drivers/firmware/raspberrypi.c b/drivers/firmware/raspberrypi.c index a200a2174611..44eb99807e33 100644 --- a/drivers/firmware/raspberrypi.c +++ b/drivers/firmware/raspberrypi.c @@ -14,6 +14,7 @@ #include #include #include +#include #include #define MBOX_MSG(chan, data28) (((data28) & ~0xf) | ((chan) & 0xf)) @@ -21,8 +22,6 @@ #define MBOX_DATA28(msg) ((msg) & ~0xf) #define MBOX_CHAN_PROPERTY 8 -#define MAX_RPI_FW_PROP_BUF_SIZE 32 - static struct platform_device *rpi_hwmon; struct rpi_firmware { @@ -144,28 +143,30 @@ EXPORT_SYMBOL_GPL(rpi_firmware_property_list); int rpi_firmware_property(struct rpi_firmware *fw, u32 tag, void *tag_data, size_t buf_size) { - /* Single tags are very small (generally 8 bytes), so the - * stack should be safe. - */ - u8 data[sizeof(struct rpi_firmware_property_tag_header) + - MAX_RPI_FW_PROP_BUF_SIZE]; - struct rpi_firmware_property_tag_header *header = - (struct rpi_firmware_property_tag_header *)data; + struct rpi_firmware_property_tag_header *header; int ret; - if (WARN_ON(buf_size > sizeof(data) - sizeof(*header))) - return -EINVAL; + /* Some mailboxes can use over 1k bytes. Rather than checking + * size and using stack or kmalloc depending on requirements, + * just use kmalloc. Mailboxes don't get called enough to worry + * too much about the time taken in the allocation. + */ + void *data = kmalloc(sizeof(*header) + buf_size, GFP_KERNEL); + if (!data) + return -ENOMEM; + + header = data; header->tag = tag; header->buf_size = buf_size; header->req_resp_size = 0; - memcpy(data + sizeof(struct rpi_firmware_property_tag_header), - tag_data, buf_size); + memcpy(data + sizeof(*header), tag_data, buf_size); + + ret = rpi_firmware_property_list(fw, data, buf_size + sizeof(*header)); + + memcpy(tag_data, data + sizeof(*header), buf_size); - ret = rpi_firmware_property_list(fw, &data, buf_size + sizeof(*header)); - memcpy(tag_data, - data + sizeof(struct rpi_firmware_property_tag_header), - buf_size); + kfree(data); return ret; }