lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Mon, 30 Nov 2015 13:27:44 +0100 From: Marcin Wojtas <mw@...ihalf.com> To: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org Cc: davem@...emloft.net, linux@....linux.org.uk, sebastian.hesselbarth@...il.com, andrew@...n.ch, jason@...edaemon.net, thomas.petazzoni@...e-electrons.com, gregory.clement@...e-electrons.com, simon.guinot@...uanux.org, nadavh@...vell.com, alior@...vell.com, xswang@...vell.com, myair@...vell.com, nitroshift@...oo.com, mw@...ihalf.com, jaz@...ihalf.com, tn@...ihalf.com, <stable@...r.kernel.org> Subject: [PATCH v4 net 4/6] net: mvneta: fix error path for building skb In the actual RX processing, there is same error path for both descriptor ring refilling and building skb fails. This is not correct, because after successful refill, the ring is already updated with newly allocated buffer. Then, in case of build_skb() fail, hitherto code left the original buffer unmapped. This patch fixes above situation by swapping error check of skb build with DMA-unmap of original buffer. Signed-off-by: Marcin Wojtas <mw@...ihalf.com> Acked-by: Simon Guinot <simon.guinot@...uanux.org> Cc: <stable@...r.kernel.org> # v4.2+ Fixes a84e32894191 ("net: mvneta: fix refilling for Rx DMA buffers") --- drivers/net/ethernet/marvell/mvneta.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c index 5dffb68..5a98c5d 100644 --- a/drivers/net/ethernet/marvell/mvneta.c +++ b/drivers/net/ethernet/marvell/mvneta.c @@ -1580,12 +1580,16 @@ static int mvneta_rx(struct mvneta_port *pp, int rx_todo, } skb = build_skb(data, pp->frag_size > PAGE_SIZE ? 0 : pp->frag_size); - if (!skb) - goto err_drop_frame; + /* After refill old buffer has to be unmapped regardless + * the skb is successfully built or not. + */ dma_unmap_single(dev->dev.parent, phys_addr, MVNETA_RX_BUF_SIZE(pp->pkt_size), DMA_FROM_DEVICE); + if (!skb) + goto err_drop_frame; + rcvd_pkts++; rcvd_bytes += rx_bytes; -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists