[MiNT] [PATCH] Check return values from kmallocs in usb.c

[David Gálvez <dgalvez75@gmail.com>]

Commit message:

Add checks for return values from kmalloc.

? .hg
? .hgignore
Index: sys/usb/src.km/usb.c
===================================================================
RCS file: /mint/freemint/sys/usb/src.km/usb.c,v
retrieving revision 1.16
diff -u -8 -r1.16 usb.c
--- sys/usb/src.km/usb.c	5 Oct 2014 19:45:58 -0000	1.16
+++ sys/usb/src.km/usb.c	6 Oct 2014 08:05:16 -0000
@@ -472,31 +472,39 @@
 long usb_get_configuration_no(struct usb_device *dev, long cfgno)
 {
 	unsigned char *buffer;
 	long result, err;
 	unsigned long tmp;
 	struct usb_config_descriptor *config;
 
 	config = (struct usb_config_descriptor *)kmalloc(9);
+	if (!config) {
+		DEBUG(("Out of memory"));
+		return -1;
+	}
 	result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno, config, 9);
 	if (result < 9) {
 		if (result < 0)
 			DEBUG(("unable to get descriptor, error %lx",
 				dev->status));
 		else
 			DEBUG(("config descriptor too short " \
 				"(expected %i, got %i)", 9, result));
 		kfree(config);
 		return -1;
 	}
 	tmp = le2cpu16(config->wTotalLength);
 	kfree(config);
 
 	buffer = (unsigned char*)kmalloc(tmp);
+	if (!buffer) {
+		DEBUG(("Out of memory"));
+		return -1;
+	}
 	result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno, buffer, tmp);
 	DEBUG(("get_conf_no %ld Result %ld, wLength %ld",
 		   cfgno, result, tmp));
 
 	err = usb_parse_config(dev, buffer, 0);
 	if (err < 0) {
 		DEBUG(("usb_new_device: Cannot parse configuration, " \
 		       "skipping device %04x:%04x\n",
@@ -876,16 +884,20 @@
 	addr = dev->devnum;
 	dev->devnum = 0;
 
 	/* send 64-byte GET-DEVICE-DESCRIPTOR request.  Since the descriptor is
 	 * only 18 bytes long, this will terminate with a short packet.  But if
 	 * the maxpacket size is 8 or 16 the device may be waiting to transmit
 	 * some more, or keeps on retransmitting the 8 byte header. */
 	desc = (struct usb_device_descriptor *)kmalloc(64);
+	if (!desc) {
+		DEBUG(("Out of memory"));
+		return -1;
+	}
 
 	dev->descriptor.bMaxPacketSize0 = 64;	    /* Start off at 64 bytes  */
 
 	/* Default to 64 byte max packet size */
 	dev->maxpacketsize = PACKET_SIZE_64;
 	dev->epmaxpacketin[0] = 64;
 	dev->epmaxpacketout[0] = 64;
 
@@ -960,16 +972,20 @@
 			"(error=%lx)", dev->status));
 		return 1;
 	}
 
 	mdelay(200);	/* Let the SET_ADDRESS settle */
 
 	tmp = sizeof(dev->descriptor);
 	tmpbuf = (unsigned char *)kmalloc(tmp);
+	if (!tmpbuf) {
+		DEBUG(("Out of memory"));
+		return -1;
+	}
 
 	err = usb_get_descriptor(dev, USB_DT_DEVICE, 0, tmpbuf, tmp);
 	if (err < tmp) {
 		if (err < 0)
 			DEBUG(("unable to get device descriptor (error=%ld)",
 			       err));
 		else
 			DEBUG(("USB device descriptor short read " \