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USB: print decoded USB error

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In case of error it also ensures the returned value is NULL.
Else a segfault would occur because the caller (e.g. remsim)
continued on with a free handler.

Change-Id: Ie7f20e3eff03acf77eb08283747ca8e032b9b4c8
This commit is contained in:
Kévin Redon
2018-07-24 09:57:16 +02:00
parent a71a6f48cb
commit 352809992c
1 changed files with 10 additions and 5 deletions
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15
host/libusb_util.c
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@@ -250,34 +250,39 @@ libusb_device_handle *usb_open_claim_interface(libusb_context *ctx,
(strlen(ifm->path) && !strcmp(path, ifm->path))) {
rc = libusb_open(*dev, &usb_devh);
if (rc < 0) {
perror("Cannot open device");
fprintf(stderr, "Cannot open device: %s\n", libusb_error_name(rc));
usb_devh = NULL;
break;
}
rc = libusb_get_configuration(usb_devh, &config);
if (rc < 0) {
perror("Cannot get current configuration");
fprintf(stderr, "Cannot get current configuration: %s\n", libusb_error_name(rc));
libusb_close(usb_devh);
usb_devh = NULL;
break;
}
if (config != ifm->configuration) {
rc = libusb_set_configuration(usb_devh, ifm->configuration);
if (rc < 0) {
perror("Cannot set configuration");
fprintf(stderr, "Cannot set configuration: %s\n", libusb_error_name(rc));
libusb_close(usb_devh);
usb_devh = NULL;
break;
}
}
rc = libusb_claim_interface(usb_devh, ifm->interface);
if (rc < 0) {
perror("Cannot claim interface");
fprintf(stderr, "Cannot claim interface: %s\n", libusb_error_name(rc));
libusb_close(usb_devh);
usb_devh = NULL;
break;
}
rc = libusb_set_interface_alt_setting(usb_devh, ifm->interface, ifm->altsetting);
if (rc < 0) {
perror("Cannot set interface altsetting");
fprintf(stderr, "Cannot set interface altsetting: %s\n", libusb_error_name(rc));
libusb_release_interface(usb_devh, ifm->interface);
libusb_close(usb_devh);
usb_devh = NULL;
break;
}
}