Patch "net/mlx4_core: Limit count field to 24 bits in qp_alloc_res" has been added to the 3.14-stable tree

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

    net/mlx4_core: Limit count field to 24 bits in qp_alloc_res

to the 3.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     net-mlx4_core-limit-count-field-to-24-bits-in-qp_alloc_res.patch
and it can be found in the queue-3.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From foo@baz Sun Dec 14 08:38:06 PST 2014
From: Jack Morgenstein <jackm@xxxxxxxxxxxxxxxxxx>
Date: Tue, 25 Nov 2014 11:54:31 +0200
Subject: net/mlx4_core: Limit count field to 24 bits in qp_alloc_res

From: Jack Morgenstein <jackm@xxxxxxxxxxxxxxxxxx>

[ Upstream commit 2d5c57d7fbfaa642fb7f0673df24f32b83d9066c ]

Some VF drivers use the upper byte of "param1" (the qp count field)
in mlx4_qp_reserve_range() to pass flags which are used to optimize
the range allocation.

Under the current code, if any of these flags are set, the 32-bit
count field yields a count greater than 2^24, which is out of range,
and this VF fails.

As these flags represent a "best-effort" allocation hint anyway, they may
safely be ignored. Therefore, the PF driver may simply mask out the bits.

Fixes: c82e9aa0a8 "mlx4_core: resource tracking for HCA resources used by guests"
Signed-off-by: Jack Morgenstein <jackm@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Or Gerlitz <ogerlitz@xxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/net/ethernet/mellanox/mlx4/resource_tracker.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/ethernet/mellanox/mlx4/resource_tracker.c
+++ b/drivers/net/ethernet/mellanox/mlx4/resource_tracker.c
@@ -1456,7 +1456,7 @@ static int qp_alloc_res(struct mlx4_dev
 
 	switch (op) {
 	case RES_OP_RESERVE:
-		count = get_param_l(&in_param);
+		count = get_param_l(&in_param) & 0xffffff;
 		align = get_param_h(&in_param);
 		err = mlx4_grant_resource(dev, slave, RES_QP, count, 0);
 		if (err)


Patches currently in stable-queue which might be from jackm@xxxxxxxxxxxxxxxxxx are

queue-3.14/net-mlx4_core-limit-count-field-to-24-bits-in-qp_alloc_res.patch
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