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authorroel kluin <roel.kluin@gmail.com>2009-08-10 01:29:52 +0000
committerDavid S. Miller <davem@davemloft.net>2009-08-13 16:26:10 -0700
commit8dd07086a1f8048428d33a1917b6209978750cb1 (patch)
tree2f6ba6838459114c802302a89d049ee2ef7a2458
parenta6fa32866567351503db8a5c3466a676ba08595f (diff)
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 <roel.kluin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/wan/lmc/lmc_main.c7
1 files 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++)
{