linux-kernel - [PATCH AUTOSEL for 4.14 41/51] staging: fsl-mc/dpio: Fix incorrect comparison

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Message-ID: <20171122222526.20021-41-alexander.levin@verizon.com>
Date:   Wed, 22 Nov 2017 22:25:46 +0000
From:   alexander.levin@...izon.com
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Ioana Radulescu <ruxandra.radulescu@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        alexander.levin@...izon.com
Subject: [PATCH AUTOSEL for 4.14 41/51] staging: fsl-mc/dpio: Fix incorrect
 comparison

From: Ioana Radulescu <ruxandra.radulescu@....com>

[ Upstream commit 8dabf52ffb6445fa5bcc8b6d2ecb615f60d0dd12 ]

For some dpio functions, a cpu id parameter value of -1 is
valid and means "any". But when trying to validate this param
value against an upper limit, in this case num_possible_cpus(),
we risk obtaining the wrong result due to an implicit cast.

Avoid an incorrect check result by explicitly comparing the
cpu id with the "any" value before verifying the upper bound.

Signed-off-by: Ioana Radulescu <ruxandra.radulescu@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 drivers/staging/fsl-mc/bus/dpio/dpio-service.c | 4 ++--
 drivers/staging/fsl-mc/include/dpaa2-io.h      | 6 ++++--
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/fsl-mc/bus/dpio/dpio-service.c b/drivers/staging/fsl-mc/bus/dpio/dpio-service.c
index f8096828f5b7..a609ec82daf3 100644
--- a/drivers/staging/fsl-mc/bus/dpio/dpio-service.c
+++ b/drivers/staging/fsl-mc/bus/dpio/dpio-service.c
@@ -76,7 +76,7 @@ static inline struct dpaa2_io *service_select_by_cpu(struct dpaa2_io *d,
 	if (d)
 		return d;
 
-	if (unlikely(cpu >= num_possible_cpus()))
+	if (cpu != DPAA2_IO_ANY_CPU && cpu >= num_possible_cpus())
 		return NULL;
 
 	/*
@@ -121,7 +121,7 @@ struct dpaa2_io *dpaa2_io_create(const struct dpaa2_io_desc *desc)
 		return NULL;
 
 	/* check if CPU is out of range (-1 means any cpu) */
-	if (desc->cpu >= num_possible_cpus()) {
+	if (desc->cpu != DPAA2_IO_ANY_CPU && desc->cpu >= num_possible_cpus()) {
 		kfree(obj);
 		return NULL;
 	}
diff --git a/drivers/staging/fsl-mc/include/dpaa2-io.h b/drivers/staging/fsl-mc/include/dpaa2-io.h
index c5646096c5d4..afc2d060d077 100644
--- a/drivers/staging/fsl-mc/include/dpaa2-io.h
+++ b/drivers/staging/fsl-mc/include/dpaa2-io.h
@@ -54,6 +54,8 @@ struct device;
  * for dequeue.
  */
 
+#define DPAA2_IO_ANY_CPU	-1
+
 /**
  * struct dpaa2_io_desc - The DPIO descriptor
  * @receives_notifications: Use notificaton mode. Non-zero if the DPIO
@@ -91,8 +93,8 @@ irqreturn_t dpaa2_io_irq(struct dpaa2_io *obj);
  * @cb:           The callback to be invoked when the notification arrives
  * @is_cdan:      Zero for FQDAN, non-zero for CDAN
  * @id:           FQID or channel ID, needed for rearm
- * @desired_cpu:  The cpu on which the notifications will show up. -1 means
- *                any CPU.
+ * @desired_cpu:  The cpu on which the notifications will show up. Use
+ *                DPAA2_IO_ANY_CPU if don't care
  * @dpio_id:      The dpio index
  * @qman64:       The 64-bit context value shows up in the FQDAN/CDAN.
  * @node:         The list node
-- 
2.11.0