linux-kernel - [stable 4.19+][PATCH 08/20] remoteproc: fix rproc_da_to

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Message-Id: <20191115223356.27675-8-mathieu.poirier@linaro.org>
Date:   Fri, 15 Nov 2019 15:33:44 -0700
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [stable 4.19+][PATCH 08/20] remoteproc: fix rproc_da_to_va in case of unallocated carveout

From: Loic Pallardy <loic.pallardy@...com>

commit 74457c40f97a98142bb13153395d304ad3c85cdd upstream

With introduction of rproc_alloc_registered_carveouts() which
delays carveout allocation just before the start of the remote
processor, rproc_da_to_va() could be called before all carveouts
are allocated.
This patch adds a check in rproc_da_to_va() to return NULL if
carveout is not allocated.

Fixes: d7c51706d095 ("remoteproc: add alloc ops in rproc_mem_entry struct")

Signed-off-by: Loic Pallardy <loic.pallardy@...com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Cc: stable <stable@...r.kernel.org> # 4.19+
Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
---
 drivers/remoteproc/remoteproc_core.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index aa6206706fe3..af9d443e7796 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -183,6 +183,10 @@ void *rproc_da_to_va(struct rproc *rproc, u64 da, int len)
 	list_for_each_entry(carveout, &rproc->carveouts, node) {
 		int offset = da - carveout->da;
 
+		/*  Verify that carveout is allocated */
+		if (!carveout->va)
+			continue;
+
 		/* try next carveout if da is too small */
 		if (offset < 0)
 			continue;
-- 
2.17.1