From 8dd07086a1f8048428d33a1917b6209978750cb1 Mon Sep 17 00:00:00 2001 From: roel kluin Date: Mon, 10 Aug 2009 01:29:52 +0000 Subject: [PATCH] lmc: Read outside array bounds If dev_alloc_skb() fails on the first iteration of the allocation loop, then we end up writing before the start of the array. Signed-off-by: Roel Kluin Signed-off-by: David S. Miller --- drivers/net/wan/lmc/lmc_main.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/net/wan/lmc/lmc_main.c b/drivers/net/wan/lmc/lmc_main.c index d1492ae5d30a..6e6b08c3a1e0 100644 --- a/drivers/net/wan/lmc/lmc_main.c +++ b/drivers/net/wan/lmc/lmc_main.c @@ -1897,11 +1897,12 @@ static void lmc_softreset (lmc_softc_t * const sc) /*fold00*/ /* * Sets end of ring */ - sc->lmc_rxring[i - 1].length |= 0x02000000; /* Set end of buffers flag */ - sc->lmc_rxring[i - 1].buffer2 = virt_to_bus (&sc->lmc_rxring[0]); /* Point back to the start */ + if (i != 0) { + sc->lmc_rxring[i - 1].length |= 0x02000000; /* Set end of buffers flag */ + sc->lmc_rxring[i - 1].buffer2 = virt_to_bus(&sc->lmc_rxring[0]); /* Point back to the start */ + } LMC_CSR_WRITE (sc, csr_rxlist, virt_to_bus (sc->lmc_rxring)); /* write base address */ - /* Initialize the transmit rings and buffers */ for (i = 0; i < LMC_TXDESCS; i++) { -- 2.30.2