[PATCH 2/8] 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@xxxxxxxxxxxx>
---
 drivers/staging/dwc2/hcd_ddma.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/dwc2/hcd_ddma.c b/drivers/staging/dwc2/hcd_ddma.c
index c7d4345..72e9788 100644
--- a/drivers/staging/dwc2/hcd_ddma.c
+++ b/drivers/staging/dwc2/hcd_ddma.c
@@ -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++;
 		}
 	}
-- 
1.8.5.rc3

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