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From 078c531e6b57f36359b74ea6c136c2ea1b5a9891 Mon Sep 17 00:00:00 2001
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From: Anthony Liguori <aliguori@us.ibm.com>
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Date: Mon, 23 Jan 2012 07:30:43 -0600
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Subject: [PATCH] e1000: bounds packet size against buffer size
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Otherwise we can write beyond the buffer and corrupt memory. This is tracked
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as CVE-2012-0029.
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Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
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(cherry picked from commit 65f82df0d7a71ce1b10cd4c5ab08888d176ac840)
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Signed-off-by: Bruce Rogers <brogers@suse.com>
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[AF: stable-0.15 does not have pci_dma_read(). Fixes BNC#740165.]
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Signed-off-by: Andreas Färber <afaerber@suse.de>
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---
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hw/e1000.c | 3 +++
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1 file changed, 3 insertions(+)
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diff --git a/hw/e1000.c b/hw/e1000.c
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index 7971457..c91790b 100644
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--- a/hw/e1000.c
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+++ b/hw/e1000.c
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@@ -472,6 +472,8 @@ process_tx_desc(E1000State *s, struct e1000_tx_desc *dp)
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bytes = split_size;
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if (tp->size + bytes > msh)
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bytes = msh - tp->size;
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+
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+ bytes = MIN(sizeof(tp->data) - tp->size, bytes);
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cpu_physical_memory_read(addr, tp->data + tp->size, bytes);
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if ((sz = tp->size + bytes) >= hdr && tp->size < hdr)
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memmove(tp->header, tp->data, hdr);
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@@ -487,6 +489,7 @@ process_tx_desc(E1000State *s, struct e1000_tx_desc *dp)
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// context descriptor TSE is not set, while data descriptor TSE is set
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DBGOUT(TXERR, "TCP segmentaion Error\n");
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} else {
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+ split_size = MIN(sizeof(tp->data) - tp->size, split_size);
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cpu_physical_memory_read(addr, tp->data + tp->size, split_size);
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tp->size += split_size;
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}
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--
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1.7.11.2
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