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staging: dwc2: fix potential use after free

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dwc2_process_non_isoc_desc() can potentially free the qtd, so null
out the qtd pointer if the call fails so we don't try to access it
later

Signed-off-by: Paul Zimmerman <paulz@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Paul Zimmerman
2013-11-22 16:43:46 -08:00
committed by Greg Kroah-Hartman
parent 9bda1aac6b
commit fbd1cd2027
1 changed files with 3 additions and 1 deletions
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4
drivers/staging/dwc2/hcd_ddma.c
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@@ -1103,8 +1103,10 @@ static void dwc2_complete_non_isoc_xfer_ddma(struct dwc2_hsotg *hsotg,
for (i = 0; i < qtd->n_desc; i++) {
if (dwc2_process_non_isoc_desc(hsotg, chan, chnum, qtd,
desc_num, halt_status,
&xfer_done))
&xfer_done)) {
qtd = NULL;
break;
}
desc_num++;
}
}