[PATCH AUTOSEL 4.4 011/100] usb: gadget: udc: fix possible sleep-in-atomic-context bugs in gr_probe()

[PATCH AUTOSEL 4.4 011/100] usb: gadget: udc: fix possible sleep-in-atomic-context bugs in gr_probe()

[Sasha Levin]

From: Jia-Ju Bai <baijiaju1990@gmail.com>

[ Upstream commit 9c1ed62ae0690dfe5d5e31d8f70e70a95cb48e52 ]

The driver may sleep while holding a spinlock.
The function call path (from bottom to top) in Linux 4.19 is:

drivers/usb/gadget/udc/core.c, 1175:
	kzalloc(GFP_KERNEL) in usb_add_gadget_udc_release
drivers/usb/gadget/udc/core.c, 1272:
	usb_add_gadget_udc_release in usb_add_gadget_udc
drivers/usb/gadget/udc/gr_udc.c, 2186:
	usb_add_gadget_udc in gr_probe
drivers/usb/gadget/udc/gr_udc.c, 2183:
	spin_lock in gr_probe

drivers/usb/gadget/udc/core.c, 1195:
	mutex_lock in usb_add_gadget_udc_release
drivers/usb/gadget/udc/core.c, 1272:
	usb_add_gadget_udc_release in usb_add_gadget_udc
drivers/usb/gadget/udc/gr_udc.c, 2186:
	usb_add_gadget_udc in gr_probe
drivers/usb/gadget/udc/gr_udc.c, 2183:
	spin_lock in gr_probe

drivers/usb/gadget/udc/gr_udc.c, 212:
	debugfs_create_file in gr_probe
drivers/usb/gadget/udc/gr_udc.c, 2197:
	gr_dfs_create in gr_probe
drivers/usb/gadget/udc/gr_udc.c, 2183:
    spin_lock in gr_probe

drivers/usb/gadget/udc/gr_udc.c, 2114:
	devm_request_threaded_irq in gr_request_irq
drivers/usb/gadget/udc/gr_udc.c, 2202:
	gr_request_irq in gr_probe
drivers/usb/gadget/udc/gr_udc.c, 2183:
    spin_lock in gr_probe

kzalloc(GFP_KERNEL), mutex_lock(), debugfs_create_file() and
devm_request_threaded_irq() can sleep at runtime.

To fix these possible bugs, usb_add_gadget_udc(), gr_dfs_create() and
gr_request_irq() are called without handling the spinlock.

These bugs are found by a static analysis tool STCheck written by myself.

Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/usb/gadget/udc/gr_udc.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/gadget/udc/gr_udc.c b/drivers/usb/gadget/udc/gr_udc.c
index b9429bc425116..594639e5cbf82 100644
--- a/drivers/usb/gadget/udc/gr_udc.c
+++ b/drivers/usb/gadget/udc/gr_udc.c
@@ -2201,8 +2201,6 @@ static int gr_probe(struct platform_device *pdev)
 		return -ENOMEM;
 	}
 
-	spin_lock(&dev->lock);
-
 	/* Inside lock so that no gadget can use this udc until probe is done */
 	retval = usb_add_gadget_udc(dev->dev, &dev->gadget);
 	if (retval) {
@@ -2211,15 +2209,21 @@ static int gr_probe(struct platform_device *pdev)
 	}
 	dev->added = 1;
 
+	spin_lock(&dev->lock);
+
 	retval = gr_udc_init(dev);
-	if (retval)
+	if (retval) {
+		spin_unlock(&dev->lock);
 		goto out;
-
-	gr_dfs_create(dev);
+	}
 
 	/* Clear all interrupt enables that might be left on since last boot */
 	gr_disable_interrupts_and_pullup(dev);
 
+	spin_unlock(&dev->lock);
+
+	gr_dfs_create(dev);
+
 	retval = gr_request_irq(dev, dev->irq);
 	if (retval) {
 		dev_err(dev->dev, "Failed to request irq %d\n", dev->irq);
@@ -2248,8 +2252,6 @@ static int gr_probe(struct platform_device *pdev)
 		dev_info(dev->dev, "regs: %p, irq %d\n", dev->regs, dev->irq);
 
 out:
-	spin_unlock(&dev->lock);
-
 	if (retval)
 		gr_remove(pdev);
 
-- 
2.20.1

[PATCH AUTOSEL 4.4 059/100] usbip: Fix unsafe unaligned pointer usage

[Sasha Levin]

From: Shuah Khan <skhan@linuxfoundation.org>

[ Upstream commit 585c91f40d201bc564d4e76b83c05b3b5363fe7e ]

Fix unsafe unaligned pointer usage in usbip network interfaces. usbip tool
build fails with new gcc -Werror=address-of-packed-member checks.

usbip_network.c: In function ‘usbip_net_pack_usb_device’:
usbip_network.c:79:32: error: taking address of packed member of ‘struct usbip_usb_device’ may result in an unaligned pointer value [-Werror=address-of-packed-member]
   79 |  usbip_net_pack_uint32_t(pack, &udev->busnum);

Fix with minor changes to pass by value instead of by address.

Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Link: https://lore.kernel.org/r/20200109012416.2875-1-skhan@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 tools/usb/usbip/src/usbip_network.c | 40 +++++++++++++++++------------
 tools/usb/usbip/src/usbip_network.h | 12 +++------
 2 files changed, 27 insertions(+), 25 deletions(-)

diff --git a/tools/usb/usbip/src/usbip_network.c b/tools/usb/usbip/src/usbip_network.c
index b4c37e76a6e08..187dfaa67d0a2 100644
--- a/tools/usb/usbip/src/usbip_network.c
+++ b/tools/usb/usbip/src/usbip_network.c
@@ -62,39 +62,39 @@ void usbip_setup_port_number(char *arg)
 	info("using port %d (\"%s\")", usbip_port, usbip_port_string);
 }
 
-void usbip_net_pack_uint32_t(int pack, uint32_t *num)
+uint32_t usbip_net_pack_uint32_t(int pack, uint32_t num)
 {
 	uint32_t i;
 
 	if (pack)
-		i = htonl(*num);
+		i = htonl(num);
 	else
-		i = ntohl(*num);
+		i = ntohl(num);
 
-	*num = i;
+	return i;
 }
 
-void usbip_net_pack_uint16_t(int pack, uint16_t *num)
+uint16_t usbip_net_pack_uint16_t(int pack, uint16_t num)
 {
 	uint16_t i;
 
 	if (pack)
-		i = htons(*num);
+		i = htons(num);
 	else
-		i = ntohs(*num);
+		i = ntohs(num);
 
-	*num = i;
+	return i;
 }
 
 void usbip_net_pack_usb_device(int pack, struct usbip_usb_device *udev)
 {
-	usbip_net_pack_uint32_t(pack, &udev->busnum);
-	usbip_net_pack_uint32_t(pack, &udev->devnum);
-	usbip_net_pack_uint32_t(pack, &udev->speed);
+	udev->busnum = usbip_net_pack_uint32_t(pack, udev->busnum);
+	udev->devnum = usbip_net_pack_uint32_t(pack, udev->devnum);
+	udev->speed = usbip_net_pack_uint32_t(pack, udev->speed);
 
-	usbip_net_pack_uint16_t(pack, &udev->idVendor);
-	usbip_net_pack_uint16_t(pack, &udev->idProduct);
-	usbip_net_pack_uint16_t(pack, &udev->bcdDevice);
+	udev->idVendor = usbip_net_pack_uint16_t(pack, udev->idVendor);
+	udev->idProduct = usbip_net_pack_uint16_t(pack, udev->idProduct);
+	udev->bcdDevice = usbip_net_pack_uint16_t(pack, udev->bcdDevice);
 }
 
 void usbip_net_pack_usb_interface(int pack __attribute__((unused)),
@@ -141,6 +141,14 @@ ssize_t usbip_net_send(int sockfd, void *buff, size_t bufflen)
 	return usbip_net_xmit(sockfd, buff, bufflen, 1);
 }
 
+static inline void usbip_net_pack_op_common(int pack,
+					    struct op_common *op_common)
+{
+	op_common->version = usbip_net_pack_uint16_t(pack, op_common->version);
+	op_common->code = usbip_net_pack_uint16_t(pack, op_common->code);
+	op_common->status = usbip_net_pack_uint32_t(pack, op_common->status);
+}
+
 int usbip_net_send_op_common(int sockfd, uint32_t code, uint32_t status)
 {
 	struct op_common op_common;
@@ -152,7 +160,7 @@ int usbip_net_send_op_common(int sockfd, uint32_t code, uint32_t status)
 	op_common.code    = code;
 	op_common.status  = status;
 
-	PACK_OP_COMMON(1, &op_common);
+	usbip_net_pack_op_common(1, &op_common);
 
 	rc = usbip_net_send(sockfd, &op_common, sizeof(op_common));
 	if (rc < 0) {
@@ -176,7 +184,7 @@ int usbip_net_recv_op_common(int sockfd, uint16_t *code)
 		goto err;
 	}
 
-	PACK_OP_COMMON(0, &op_common);
+	usbip_net_pack_op_common(0, &op_common);
 
 	if (op_common.version != USBIP_VERSION) {
 		dbg("version mismatch: %d %d", op_common.version,
diff --git a/tools/usb/usbip/src/usbip_network.h b/tools/usb/usbip/src/usbip_network.h
index c1e875cf1078c..573fa839b66b7 100644
--- a/tools/usb/usbip/src/usbip_network.h
+++ b/tools/usb/usbip/src/usbip_network.h
@@ -33,12 +33,6 @@ struct op_common {
 
 } __attribute__((packed));
 
-#define PACK_OP_COMMON(pack, op_common)  do {\
-	usbip_net_pack_uint16_t(pack, &(op_common)->version);\
-	usbip_net_pack_uint16_t(pack, &(op_common)->code);\
-	usbip_net_pack_uint32_t(pack, &(op_common)->status);\
-} while (0)
-
 /* ---------------------------------------------------------------------- */
 /* Dummy Code */
 #define OP_UNSPEC	0x00
@@ -164,11 +158,11 @@ struct op_devlist_reply_extra {
 } while (0)
 
 #define PACK_OP_DEVLIST_REPLY(pack, reply)  do {\
-	usbip_net_pack_uint32_t(pack, &(reply)->ndev);\
+	(reply)->ndev = usbip_net_pack_uint32_t(pack, (reply)->ndev);\
 } while (0)
 
-void usbip_net_pack_uint32_t(int pack, uint32_t *num);
-void usbip_net_pack_uint16_t(int pack, uint16_t *num);
+uint32_t usbip_net_pack_uint32_t(int pack, uint32_t num);
+uint16_t usbip_net_pack_uint16_t(int pack, uint16_t num);
 void usbip_net_pack_usb_device(int pack, struct usbip_usb_device *udev);
 void usbip_net_pack_usb_interface(int pack, struct usbip_usb_interface *uinf);
 
-- 
2.20.1