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authorRobert Love <robert.w.love@intel.com>2010-03-24 10:02:04 +0000
committerDavid S. Miller <davem@davemloft.net>2010-03-26 11:56:03 -0700
commita7551b75fe47fb6fb70f679935845e741c5e0855 (patch)
tree935b004c4fcda47771a68255dec2f8feb2e154b1 /drivers/net/ixgbe
parente0fce6950b822aba7840d82c2d2018f1e1b8276b (diff)
ixgbe: Don't allow user buffer count to exceed 256
If the user buffer count was 256 the shift would place a 1 in the offset region leading to errors. It also overwrites the uers buffer list. This patch makes sure that at most 256 user buffers are allowed for DDP and the buffer count is masked properly such that it doesn't overwrite the offset when shifting the bits. Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: Yi Zou <yi.zou@intel.com> Signed-off-by: Frank Zhang <frank_1.zhang@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ixgbe')
-rw-r--r--drivers/net/ixgbe/ixgbe_fcoe.c18
1 files changed, 10 insertions, 8 deletions
diff --git a/drivers/net/ixgbe/ixgbe_fcoe.c b/drivers/net/ixgbe/ixgbe_fcoe.c
index 700cfc0aa1b9..e1978da49e5b 100644
--- a/drivers/net/ixgbe/ixgbe_fcoe.c
+++ b/drivers/net/ixgbe/ixgbe_fcoe.c
@@ -202,6 +202,15 @@ int ixgbe_fcoe_ddp_get(struct net_device *netdev, u16 xid,
addr = sg_dma_address(sg);
len = sg_dma_len(sg);
while (len) {
+ /* max number of buffers allowed in one DDP context */
+ if (j >= IXGBE_BUFFCNT_MAX) {
+ netif_err(adapter, drv, adapter->netdev,
+ "xid=%x:%d,%d,%d:addr=%llx "
+ "not enough descriptors\n",
+ xid, i, j, dmacount, (u64)addr);
+ goto out_noddp_free;
+ }
+
/* get the offset of length of current buffer */
thisoff = addr & ((dma_addr_t)bufflen - 1);
thislen = min((bufflen - thisoff), len);
@@ -227,20 +236,13 @@ int ixgbe_fcoe_ddp_get(struct net_device *netdev, u16 xid,
len -= thislen;
addr += thislen;
j++;
- /* max number of buffers allowed in one DDP context */
- if (j > IXGBE_BUFFCNT_MAX) {
- DPRINTK(DRV, ERR, "xid=%x:%d,%d,%d:addr=%llx "
- "not enough descriptors\n",
- xid, i, j, dmacount, (u64)addr);
- goto out_noddp_free;
- }
}
}
/* only the last buffer may have non-full bufflen */
lastsize = thisoff + thislen;
fcbuff = (IXGBE_FCBUFF_4KB << IXGBE_FCBUFF_BUFFSIZE_SHIFT);
- fcbuff |= (j << IXGBE_FCBUFF_BUFFCNT_SHIFT);
+ fcbuff |= ((j & 0xff) << IXGBE_FCBUFF_BUFFCNT_SHIFT);
fcbuff |= (firstoff << IXGBE_FCBUFF_OFFSET_SHIFT);
fcbuff |= (IXGBE_FCBUFF_VALID);