From: Roger Oksanen Date: Sat, 19 Dec 2009 04:18:21 +0000 (-0800) Subject: e100: Fix broken cbs accounting due to missing memset. X-Git-Tag: Ubuntu-5.2.0-15.16~26618^2~10 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=70abc8cb90e679d8519721e2761d8366a18212a6;p=mirror_ubuntu-eoan-kernel.git e100: Fix broken cbs accounting due to missing memset. Alan Stern noticed that e100 caused slab corruption. commit 98468efddb101f8a29af974101c17ba513b07be1 changed the allocation of cbs to use dma pools that don't return zeroed memory, especially the cb->status field used to track which cb to clean, causing (the visible) double freeing of skbs and a wrong free cbs count. Now the cbs are explicitly zeroed at allocation time. Reported-by: Alan Stern Tested-by: Alan Stern Signed-off-by: Roger Oksanen Acked-by: Jesse Brandeburg Signed-off-by: David S. Miller --- diff --git a/drivers/net/e100.c b/drivers/net/e100.c index 929701ca07d3..839fb2b136d3 100644 --- a/drivers/net/e100.c +++ b/drivers/net/e100.c @@ -1829,6 +1829,7 @@ static int e100_alloc_cbs(struct nic *nic) &nic->cbs_dma_addr); if (!nic->cbs) return -ENOMEM; + memset(nic->cbs, 0, count * sizeof(struct cb)); for (cb = nic->cbs, i = 0; i < count; cb++, i++) { cb->next = (i + 1 < count) ? cb + 1 : nic->cbs; @@ -1837,7 +1838,6 @@ static int e100_alloc_cbs(struct nic *nic) cb->dma_addr = nic->cbs_dma_addr + i * sizeof(struct cb); cb->link = cpu_to_le32(nic->cbs_dma_addr + ((i+1) % count) * sizeof(struct cb)); - cb->skb = NULL; } nic->cb_to_use = nic->cb_to_send = nic->cb_to_clean = nic->cbs;