mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-22 15:02:32 +00:00
7b31c2e9ed
Backport Russell King's series [1] net: mvneta: reduce size of TSO header allocation to pending-5.15 to fix random crashes on Turris Omnia. This also backports two patches that are dependencies to this series: net: mvneta: Delete unused variable net: mvneta: fix potential double-frees in mvneta_txq_sw_deinit() [1] https://lore.kernel.org/netdev/ZCsbJ4nG+So%2Fn9qY@shell.armlinux.org.uk/ Signed-off-by: Marek Behún <kabel@kernel.org> Signed-off-by: Christian Lamparter <chunkeey@gmail.com> (squashed)
38 lines
1.4 KiB
Diff
38 lines
1.4 KiB
Diff
From 0cf39c6543469aae4a30cba354243125514ed568 Mon Sep 17 00:00:00 2001
|
|
From: "Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>
|
|
Date: Wed, 29 Mar 2023 13:11:17 +0100
|
|
Subject: [PATCH] net: mvneta: fix potential double-frees in
|
|
mvneta_txq_sw_deinit()
|
|
|
|
Reported on the Turris forum, mvneta provokes kernel warnings in the
|
|
architecture DMA mapping code when mvneta_setup_txqs() fails to
|
|
allocate memory. This happens because when mvneta_cleanup_txqs() is
|
|
called in the mvneta_stop() path, we leave pointers in the structure
|
|
that have been freed.
|
|
|
|
Then on mvneta_open(), we call mvneta_setup_txqs(), which starts
|
|
allocating memory. On memory allocation failure, mvneta_cleanup_txqs()
|
|
will walk all the queues freeing any non-NULL pointers - which includes
|
|
pointers that were previously freed in mvneta_stop().
|
|
|
|
Fix this by setting these pointers to NULL to prevent double-freeing
|
|
of the same memory.
|
|
|
|
Link: https://forum.turris.cz/t/random-kernel-exceptions-on-hbl-tos-7-0/18865/8
|
|
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
|
|
---
|
|
drivers/net/ethernet/marvell/mvneta.c | 2 ++
|
|
1 file changed, 2 insertions(+)
|
|
|
|
--- a/drivers/net/ethernet/marvell/mvneta.c
|
|
+++ b/drivers/net/ethernet/marvell/mvneta.c
|
|
@@ -3481,6 +3481,8 @@ static void mvneta_txq_sw_deinit(struct
|
|
|
|
netdev_tx_reset_queue(nq);
|
|
|
|
+ txq->buf = NULL;
|
|
+ txq->tso_hdrs = NULL;
|
|
txq->descs = NULL;
|
|
txq->last_desc = 0;
|
|
txq->next_desc_to_proc = 0;
|