Messages in this thread Patch in this message |  | | Date | Mon, 30 Apr 2001 14:33:21 +0200 (CEST) | From | Tobias Ringstrom <> | Subject | Using alloc_skb causes memory corruption in 2.4.4 |
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I get severe memory corruption when forwarding packets from eth1 to eth0, where eth0 is a 3Com 905C-TX (zc, hw checksumming), and eth1 is a Davicom 9102. In every case it is the last two bytes of a 4096-byte block that have been cleared.
To make a long bug hunting story short, the eth1 driver (dmfe) uses alloc_skb for skbuf allocation, and if I change it into dev_alloc_skb, the problem disappears.
Did I find the real problem, or did I just hide it?
/Tobias
diff -ru linux-2.4.4.orig/drivers/net/dmfe.c linux-2.4.4/drivers/net/dmfe.c --- linux-2.4.4.orig/drivers/net/dmfe.c Sat Apr 28 11:41:49 2001 +++ linux-2.4.4/drivers/net/dmfe.c Mon Apr 30 15:15:02 2001 @@ -1306,7 +1306,7 @@ rxptr = db->rx_insert_ptr;
while (db->rx_avail_cnt < RX_DESC_CNT) { - if ((skb = alloc_skb(RX_ALLOC_SIZE, GFP_ATOMIC)) == NULL) + if ((skb = dev_alloc_skb(RX_ALLOC_SIZE)) == NULL) break; rxptr->rx_skb_ptr = (u32) skb; rxptr->rdes2 = virt_to_bus(skb->tail); - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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