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usb: ehci: fix memory leak in ehci_process_itd

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While processing isochronous transfer descriptors(iTD), if the page
select(PG) field value is out of bands it will return. In this
situation the ehci's sg list is not freed thus leading to a memory
leak issue. This patch avoid this.

Signed-off-by: Li Qiang <liqiang6-s@360.cn>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
This commit is contained in:
Li Qiang 2016-09-18 19:48:35 -07:00 committed by Michael Tokarev
parent a43edcf20a
commit b16c129daf
1 changed files with 1 additions and 0 deletions
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hw/usb/hcd-ehci.c
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@ -1426,6 +1426,7 @@ static int ehci_process_itd(EHCIState *ehci,
if (off + len > 4096) {
/* transfer crosses page border */
if (pg == 6) {
qemu_sglist_destroy(&ehci->isgl);
return -1; /* avoid page pg + 1 */
}
ptr2 = (itd->bufptr[pg + 1] & ITD_BUFPTR_MASK);