[PATCH AUTOSEL 4.19 1/9] HID: uhid: Over-ride the default maximum data buffer value with our own

[PATCH AUTOSEL 4.19 1/9] HID: uhid: Over-ride the default maximum data buffer value with our own

[Sasha Levin]

From: Lee Jones <lee@kernel.org>

[ Upstream commit 1c5d4221240a233df2440fe75c881465cdf8da07 ]

The default maximum data buffer size for this interface is UHID_DATA_MAX
(4k).  When data buffers are being processed, ensure this value is used
when ensuring the sanity, rather than a value between the user provided
value and HID_MAX_BUFFER_SIZE (16k).

Signed-off-by: Lee Jones <lee@kernel.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/hid/uhid.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/hid/uhid.c b/drivers/hid/uhid.c
index e128b9ce156df..44df81d56d9ca 100644
--- a/drivers/hid/uhid.c
+++ b/drivers/hid/uhid.c
@@ -398,6 +398,7 @@ struct hid_ll_driver uhid_hid_driver = {
 	.parse = uhid_hid_parse,
 	.raw_request = uhid_hid_raw_request,
 	.output_report = uhid_hid_output_report,
+	.max_buffer_size = UHID_DATA_MAX,
 };
 EXPORT_SYMBOL_GPL(uhid_hid_driver);
 
-- 
2.39.2

[PATCH AUTOSEL 4.19 3/9] HID: intel-ish-hid: ipc: Fix potential use-after-free in work function

[Sasha Levin]

From: Reka Norman <rekanorman@chromium.org>

[ Upstream commit 8ae2f2b0a28416ed2f6d8478ac8b9f7862f36785 ]

When a reset notify IPC message is received, the ISR schedules a work
function and passes the ISHTP device to it via a global pointer
ishtp_dev. If ish_probe() fails, the devm-managed device resources
including ishtp_dev are freed, but the work is not cancelled, causing a
use-after-free when the work function tries to access ishtp_dev. Use
devm_work_autocancel() instead, so that the work is automatically
cancelled if probe fails.

Signed-off-by: Reka Norman <rekanorman@chromium.org>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/hid/intel-ish-hid/ipc/ipc.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/hid/intel-ish-hid/ipc/ipc.c b/drivers/hid/intel-ish-hid/ipc/ipc.c
index e00b9dbe220f1..abc94235100c6 100644
--- a/drivers/hid/intel-ish-hid/ipc/ipc.c
+++ b/drivers/hid/intel-ish-hid/ipc/ipc.c
@@ -13,6 +13,7 @@
  * more details.
  */
 
+#include <linux/devm-helpers.h>
 #include <linux/sched.h>
 #include <linux/spinlock.h>
 #include <linux/delay.h>
@@ -618,7 +619,6 @@ static void	recv_ipc(struct ishtp_device *dev, uint32_t doorbell_val)
 	case MNG_RESET_NOTIFY:
 		if (!ishtp_dev) {
 			ishtp_dev = dev;
-			INIT_WORK(&fw_reset_work, fw_reset_work_fn);
 		}
 		schedule_work(&fw_reset_work);
 		break;
@@ -909,6 +909,7 @@ struct ishtp_device *ish_dev_init(struct pci_dev *pdev)
 {
 	struct ishtp_device *dev;
 	int	i;
+	int	ret;
 
 	dev = devm_kzalloc(&pdev->dev,
 			   sizeof(struct ishtp_device) + sizeof(struct ish_hw),
@@ -945,6 +946,12 @@ struct ishtp_device *ish_dev_init(struct pci_dev *pdev)
 		list_add_tail(&tx_buf->link, &dev->wr_free_list_head.link);
 	}
 
+	ret = devm_work_autocancel(&pdev->dev, &fw_reset_work, fw_reset_work_fn);
+	if (ret) {
+		dev_err(dev->devc, "Failed to initialise FW reset work\n");
+		return NULL;
+	}
+
 	dev->ops = &ish_hw_ops;
 	dev->devc = &pdev->dev;
 	dev->mtu = IPC_PAYLOAD_SIZE - sizeof(struct ishtp_msg_hdr);
-- 
2.39.2