[PATCH] usbip: add NULL check for calloc in do_standalone_mode

[longlong yan]

Add a NULL check for the return value of calloc() in
do_standalone_mode(). If calloc() fails and returns NULL, the
subsequent access to fds[i].fd would cause a NULL pointer
dereference.

Signed-off-by: longlong yan <yanlonglong@xxxxxxxxxx>
---
 tools/usb/usbip/src/usbipd.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/usb/usbip/src/usbipd.c b/tools/usb/usbip/src/usbipd.c
index 3e22b651c754..dbc2b48363b2 100644
--- a/tools/usb/usbip/src/usbipd.c
+++ b/tools/usb/usbip/src/usbipd.c
@@ -544,6 +544,11 @@ 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 pollfd");
+		usbip_driver_close(driver);
+		return -1;
+	}
 	for (i = 0; i < nsockfd; i++) {
 		fds[i].fd = sockfdlist[i];
 		fds[i].events = POLLIN;
-- 
2.43.0