[PATCH] usb: usbip: add NULL check after calloc()

[longlong yan]

Two calloc() calls in the usbip driver lack NULL return checks, leading
to potential NULL pointer dereferences on allocation failure:

1. usbipd.c do_standalone_mode(): the allocated `fds` array is
   immediately dereferenced in the following for-loop via fds[i].fd
   without checking for NULL.

2. usbip_host_common.c usbip_exported_device_new(): the allocated
   `edev` is immediately dereferenced via edev->sudev without checking
   for NULL.

Add NULL checks after each calloc(), returning -1 in do_standalone_mode()
and using the existing goto err path in usbip_exported_device_new(),
consistent with the error handling already present in both functions.

Signed-off-by: longlong yan <yanlonglong@xxxxxxxxxx>
---
 tools/usb/usbip/libsrc/usbip_host_common.c | 2 ++
 tools/usb/usbip/src/usbipd.c               | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/tools/usb/usbip/libsrc/usbip_host_common.c b/tools/usb/usbip/libsrc/usbip_host_common.c
index 01599cb2fa7b..8ad367e09e78 100644
--- a/tools/usb/usbip/libsrc/usbip_host_common.c
+++ b/tools/usb/usbip/libsrc/usbip_host_common.c
@@ -71,6 +71,8 @@ struct usbip_exported_device *usbip_exported_device_new(
 	int i;
 
 	edev = calloc(1, sizeof(struct usbip_exported_device));
+	if (!edev)
+		goto err;
 
 	edev->sudev =
 		udev_device_new_from_syspath(udev_context, sdevpath);
diff --git a/tools/usb/usbip/src/usbipd.c b/tools/usb/usbip/src/usbipd.c
index 3e22b651c754..cc707dea2882 100644
--- a/tools/usb/usbip/src/usbipd.c
+++ b/tools/usb/usbip/src/usbipd.c
@@ -544,6 +544,10 @@ static int do_standalone_mode(int daemonize, int ipv4, int ipv6)
 	dbg("listening on %d address%s", nsockfd, (nsockfd == 1) ? "" : "es");
 
 	fds = calloc(nsockfd, sizeof(struct pollfd));
+	if (!fds) {
+		err("calloc for fds");
+		return -1;
+	}
 	for (i = 0; i < nsockfd; i++) {
 		fds[i].fd = sockfdlist[i];
 		fds[i].events = POLLIN;
-- 
2.43.0