From: Russell King (Oracle) Date: Wed, 29 Mar 2023 12:11:17 +0000 (+0100) Subject: net: mvneta: fix potential double-frees in mvneta_txq_sw_deinit() X-Git-Tag: v6.6.7~3202^2~3 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=2960a2d33b02345c6d710251206053678f92246b;p=platform%2Fkernel%2Flinux-starfive.git 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. Fixes: 2adb719d74f6 ("net: mvneta: Implement software TSO") Link: https://forum.turris.cz/t/random-kernel-exceptions-on-hbl-tos-7-0/18865/8 Signed-off-by: Russell King (Oracle) Link: https://lore.kernel.org/r/E1phUe5-00EieL-7q@rmk-PC.armlinux.org.uk Signed-off-by: Jakub Kicinski --- diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c index 0e39d199ff06..2cad76d0a50e 100644 --- a/drivers/net/ethernet/marvell/mvneta.c +++ b/drivers/net/ethernet/marvell/mvneta.c @@ -3549,6 +3549,8 @@ static void mvneta_txq_sw_deinit(struct mvneta_port *pp, 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;