[PATCH] [media] st-hva: Fix potential NULL pointer dereferences

* [PATCH] [media] st-hva: Fix potential NULL pointer dereferences
@ 2021-05-19 12:04 Evgeny Novikov
  0 siblings, 0 replies; only message in thread
From: Evgeny Novikov @ 2021-05-19 12:04 UTC (permalink / raw)
  To: Jean-Christophe Trotin
  Cc: Evgeny Novikov, Mauro Carvalho Chehab, linux-media, linux-kernel,
	ldv-project

When ctx_id >= HVA_MAX_INSTANCES in hva_hw_its_irq_thread() it tries to
access fields of ctx that is NULL at that point. The patch gets rid of
these accesses.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Evgeny Novikov <novikov@ispras.ru>
---
 drivers/media/platform/sti/hva/hva-hw.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/media/platform/sti/hva/hva-hw.c b/drivers/media/platform/sti/hva/hva-hw.c
index f59811e27f51..6eeee5017fac 100644
--- a/drivers/media/platform/sti/hva/hva-hw.c
+++ b/drivers/media/platform/sti/hva/hva-hw.c
@@ -130,8 +130,7 @@ static irqreturn_t hva_hw_its_irq_thread(int irq, void *arg)
 	ctx_id = (hva->sts_reg & 0xFF00) >> 8;
 	if (ctx_id >= HVA_MAX_INSTANCES) {
 		dev_err(dev, "%s     %s: bad context identifier: %d\n",
-			ctx->name, __func__, ctx_id);
-		ctx->hw_err = true;
+			HVA_PREFIX, __func__, ctx_id);
 		goto out;
 	}
 
-- 
2.26.2


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