This is a note to let you know that I've just added the patch titled

staging: fsl-mc/dpio: Fix incorrect comparison

to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: staging-fsl-mc-dpio-fix-incorrect-comparison.patch and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From foo@baz Wed Dec 6 18:04:41 CET 2017

From: Ioana Radulescu ruxandra.radulescu@nxp.com Date: Thu, 28 Sep 2017 09:10:33 -0500 Subject: staging: fsl-mc/dpio: Fix incorrect comparison

From: Ioana Radulescu ruxandra.radulescu@nxp.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@nxp.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- 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(-)

--- 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_s 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 s 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; } --- 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 * @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

Patches currently in stable-queue which might be from ruxandra.radulescu@nxp.com are

queue-4.14/staging-fsl-dpaa2-eth-account-for-rx-fd-buffers-on-error-path.patch queue-4.14/staging-fsl-mc-dpio-fix-incorrect-comparison.patch