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From: mathieu.poirier@linaro.org (Mathieu Poirier)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 06/13] coresight: Fix csdev connections initialisation
Date: Thu, 30 Jun 2016 10:22:12 -0600	[thread overview]
Message-ID: <1467303739-12543-7-git-send-email-mathieu.poirier@linaro.org> (raw)
In-Reply-To: <1467303739-12543-1-git-send-email-mathieu.poirier@linaro.org>

From: Suzuki K Poulose <suzuki.poulose@arm.com>

This is a cleanup patch.

coresight_device->conns holds an array to point to the devices
connected to the OUT ports of a component. Sinks, e.g ETR, do not
have an OUT port (nr_outport = 0), as it streams the trace to
memory via AXI.

At coresight_register() we do :

	conns = kcalloc(csdev->nr_outport, sizeof(*conns), GFP_KERNEL);
	if (!conns) {
		ret = -ENOMEM;
		goto err_kzalloc_conns;
	}

For ETR, since the total size requested for kcalloc is zero, the return
value is, ZERO_SIZE_PTR ( != NULL). Hence, csdev->conns = ZERO_SIZE_PTR
which cannot be verified later to contain a valid pointer. The code which
accesses the csdev->conns is bounded by the csdev->nr_outport check,
hence we don't try to dereference the ZERO_SIZE_PTR. This patch cleans
up the csdev->conns initialisation to make sure we initialise it
properly(i.e, either NULL or valid conns array).

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
---
 drivers/hwtracing/coresight/coresight.c | 24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
index ceeaaea41ed6..bb20ee9747e1 100644
--- a/drivers/hwtracing/coresight/coresight.c
+++ b/drivers/hwtracing/coresight/coresight.c
@@ -894,7 +894,7 @@ struct coresight_device *coresight_register(struct coresight_desc *desc)
 	int nr_refcnts = 1;
 	atomic_t *refcnts = NULL;
 	struct coresight_device *csdev;
-	struct coresight_connection *conns;
+	struct coresight_connection *conns = NULL;
 
 	csdev = kzalloc(sizeof(*csdev), GFP_KERNEL);
 	if (!csdev) {
@@ -922,16 +922,20 @@ struct coresight_device *coresight_register(struct coresight_desc *desc)
 
 	csdev->nr_inport = desc->pdata->nr_inport;
 	csdev->nr_outport = desc->pdata->nr_outport;
-	conns = kcalloc(csdev->nr_outport, sizeof(*conns), GFP_KERNEL);
-	if (!conns) {
-		ret = -ENOMEM;
-		goto err_kzalloc_conns;
-	}
 
-	for (i = 0; i < csdev->nr_outport; i++) {
-		conns[i].outport = desc->pdata->outports[i];
-		conns[i].child_name = desc->pdata->child_names[i];
-		conns[i].child_port = desc->pdata->child_ports[i];
+	/* Initialise connections if there is at least one outport */
+	if (csdev->nr_outport) {
+		conns = kcalloc(csdev->nr_outport, sizeof(*conns), GFP_KERNEL);
+		if (!conns) {
+			ret = -ENOMEM;
+			goto err_kzalloc_conns;
+		}
+
+		for (i = 0; i < csdev->nr_outport; i++) {
+			conns[i].outport = desc->pdata->outports[i];
+			conns[i].child_name = desc->pdata->child_names[i];
+			conns[i].child_port = desc->pdata->child_ports[i];
+		}
 	}
 
 	csdev->conns = conns;
-- 
2.7.4

  parent reply	other threads:[~2016-06-30 16:22 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-30 16:22 [PATCH 00/13] coresight: next v4.7-rc5 Mathieu Poirier
2016-06-30 16:22 ` [PATCH 01/13] coresight: access conn->child_name only if it's initialised Mathieu Poirier
2016-06-30 16:22 ` [PATCH 02/13] coresight-stm: support mmapping channel regions with mmio_addr Mathieu Poirier
2016-06-30 16:22 ` [PATCH 03/13] coresight: always use stashed trace id value in etm4_trace_id Mathieu Poirier
2016-06-30 16:22 ` [PATCH 04/13] coresight: Remove erroneous dma_free_coherent in tmc_probe Mathieu Poirier
2016-06-30 16:22 ` [PATCH 05/13] coresight: Consolidate error handling path for tmc_probe Mathieu Poirier
2016-06-30 16:22 ` Mathieu Poirier [this message]
2016-06-30 16:22 ` [PATCH 07/13] coresight: tmc: Limit the trace to available data Mathieu Poirier
2016-06-30 16:22 ` [PATCH 08/13] coresight: etmv4: Fix ETMv4x peripheral ID table Mathieu Poirier
2016-06-30 16:22 ` [PATCH 09/13] coresight: Cleanup TMC status check Mathieu Poirier
2016-06-30 16:22 ` [PATCH 10/13] coresight: Add better messages for coresight_timeout Mathieu Poirier
2016-06-30 16:22 ` [PATCH 11/13] coresight: delay initialisation when children are missing Mathieu Poirier
2016-06-30 16:22 ` [PATCH 12/13] coresight: document binding acronyms Mathieu Poirier
2016-06-30 16:22 ` [PATCH 13/13] coresight: add PM runtime calls to coresight_simple_func() Mathieu Poirier

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