From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:38210) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gTlBm-0007fx-Ke for qemu-devel@nongnu.org; Mon, 03 Dec 2018 05:10:55 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gTlBi-0001Xo-FJ for qemu-devel@nongnu.org; Mon, 03 Dec 2018 05:10:54 -0500 Received: from mx1.redhat.com ([209.132.183.28]:50296) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gTlBi-0001XB-AZ for qemu-devel@nongnu.org; Mon, 03 Dec 2018 05:10:50 -0500 From: Gerd Hoffmann Date: Mon, 3 Dec 2018 11:10:44 +0100 Message-Id: <20181203101045.27976-2-kraxel@redhat.com> In-Reply-To: <20181203101045.27976-1-kraxel@redhat.com> References: <20181203101045.27976-1-kraxel@redhat.com> Subject: [Qemu-devel] [PATCH for-3.1 v3 1/2] usb-mtp: fix utf16_to_str List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: public@hansmi.ch, Gerd Hoffmann Make utf16_to_str return an allocated string. Remove the assumtion that the number of string bytes equals the number of utf16 chars (which is only true for ascii chars). Instead call wcstombs twice, once to figure the storage size and once for the actual conversion (as suggested by the wcstombs manpage). Reported-by: Michael Hanselmann Signed-off-by: Gerd Hoffmann --- hw/usb/dev-mtp.c | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) diff --git a/hw/usb/dev-mtp.c b/hw/usb/dev-mtp.c index 00a3691bae..0f6a9702ef 100644 --- a/hw/usb/dev-mtp.c +++ b/hw/usb/dev-mtp.c @@ -1593,17 +1593,23 @@ static void usb_mtp_cancel_packet(USBDevice *dev, USBPacket *p) fprintf(stderr, "%s\n", __func__); } -static void utf16_to_str(uint8_t len, uint16_t *arr, char *name) +static char *utf16_to_str(uint8_t len, uint16_t *arr) { - int count; - wchar_t *wstr = g_new0(wchar_t, len); + wchar_t *wstr = g_new0(wchar_t, len + 1); + int count, dlen; + char *dest; for (count = 0; count < len; count++) { + /* FIXME: not working for surrogate pairs */ wstr[count] = (wchar_t)arr[count]; } + wstr[count] = 0; - wcstombs(name, wstr, len); + dlen = wcstombs(NULL, wstr, 0) + 1; + dest = g_malloc(dlen); + wcstombs(dest, wstr, dlen); g_free(wstr); + return dest; } /* Wrapper around write, returns 0 on failure */ @@ -1703,7 +1709,7 @@ static void usb_mtp_write_metadata(MTPState *s) { MTPData *d = s->data_out; ObjectInfo *dataset = (ObjectInfo *)d->data; - char *filename = g_new0(char, dataset->length); + char *filename; MTPObject *o; MTPObject *p = usb_mtp_object_lookup(s, s->dataset.parent_handle); uint32_t next_handle = s->next_handle; @@ -1711,7 +1717,7 @@ static void usb_mtp_write_metadata(MTPState *s) assert(!s->write_pending); assert(p != NULL); - utf16_to_str(dataset->length, dataset->filename, filename); + filename = utf16_to_str(dataset->length, dataset->filename); o = usb_mtp_object_lookup_name(p, filename, dataset->length); if (o != NULL) { -- 2.9.3