Patch "net: mvpp2: fix the txq_init error path" has been added to the 4.14-stable tree

[<gregkh@linuxfoundation.org>]

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

    net: mvpp2: fix the txq_init error path

to the 4.14-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-mvpp2-fix-the-txq_init-error-path.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 Thu Feb  1 13:45:42 CET 2018
From: Antoine Tenart <antoine.tenart@free-electrons.com>
Date: Tue, 28 Nov 2017 14:19:48 +0100
Subject: net: mvpp2: fix the txq_init error path

From: Antoine Tenart <antoine.tenart@free-electrons.com>


[ Upstream commit ba2d8d887d962c2f790e6dc01b2fd25b4608720b ]

When an allocation in the txq_init path fails, the allocated buffers
end-up being freed twice: in the txq_init error path, and in txq_deinit.
This lead to issues as txq_deinit would work on already freed memory
regions:

    kernel BUG at mm/slub.c:3915!
    Internal error: Oops - BUG: 0 [#1] PREEMPT SMP

This patch fixes this by removing the txq_init own error path, as the
txq_deinit function is always called on errors. This was introduced by
TSO as way more buffers are allocated.

Fixes: 186cd4d4e414 ("net: mvpp2: software tso support")
Signed-off-by: Antoine Tenart <antoine.tenart@free-electrons.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/ethernet/marvell/mvpp2.c |   20 ++------------------
 1 file changed, 2 insertions(+), 18 deletions(-)

--- a/drivers/net/ethernet/marvell/mvpp2.c
+++ b/drivers/net/ethernet/marvell/mvpp2.c
@@ -5597,7 +5597,7 @@ static int mvpp2_txq_init(struct mvpp2_p
 						sizeof(*txq_pcpu->buffs),
 						GFP_KERNEL);
 		if (!txq_pcpu->buffs)
-			goto cleanup;
+			return -ENOMEM;
 
 		txq_pcpu->count = 0;
 		txq_pcpu->reserved_num = 0;
@@ -5610,26 +5610,10 @@ static int mvpp2_txq_init(struct mvpp2_p
 					   &txq_pcpu->tso_headers_dma,
 					   GFP_KERNEL);
 		if (!txq_pcpu->tso_headers)
-			goto cleanup;
+			return -ENOMEM;
 	}
 
 	return 0;
-cleanup:
-	for_each_present_cpu(cpu) {
-		txq_pcpu = per_cpu_ptr(txq->pcpu, cpu);
-		kfree(txq_pcpu->buffs);
-
-		dma_free_coherent(port->dev->dev.parent,
-				  txq_pcpu->size * TSO_HEADER_SIZE,
-				  txq_pcpu->tso_headers,
-				  txq_pcpu->tso_headers_dma);
-	}
-
-	dma_free_coherent(port->dev->dev.parent,
-			  txq->size * MVPP2_DESC_ALIGNED_SIZE,
-			  txq->descs, txq->descs_dma);
-
-	return -ENOMEM;
 }
 
 /* Free allocated TXQ resources */


Patches currently in stable-queue which might be from antoine.tenart@free-electrons.com are

queue-4.14/net-phy-marvell10g-fix-the-phy-id-mask.patch
queue-4.14/net-mvpp2-fix-the-txq_init-error-path.patch
queue-4.14/crypto-inside-secure-avoid-unmapping-dma-memory-that-was-not-mapped.patch
queue-4.14/crypto-inside-secure-fix-hash-when-length-is-a-multiple-of-a-block.patch