From: Anthony Liguori <aligu...@us.ibm.com>
Otherwise we can write beyond the buffer and corrupt memory. This is tracked
as CVE-2012-0029.
Signed-off-by: Anthony Liguori <aligu...@us.ibm.com>
(cherry picked from commit 65f82df0d7a71ce1b10cd4c5ab08888d176ac840)
Signed-off-by: Bruce Rogers <brog...@suse.com>
[AF: stable-0.15 does not have pci_dma_read(). Fixes BNC#740165.]
Signed-off-by: Andreas Färber <afaer...@suse.de>
---
hw/e1000.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/hw/e1000.c b/hw/e1000.c
index 7971457..c91790b 100644
--- a/hw/e1000.c
+++ b/hw/e1000.c
@@ -472,6 +472,8 @@ process_tx_desc(E1000State *s, struct e1000_tx_desc *dp)
bytes = split_size;
if (tp->size + bytes > msh)
bytes = msh - tp->size;
+
+ bytes = MIN(sizeof(tp->data) - tp->size, bytes);
cpu_physical_memory_read(addr, tp->data + tp->size, bytes);
if ((sz = tp->size + bytes) >= hdr && tp->size < hdr)
memmove(tp->header, tp->data, hdr);
@@ -487,6 +489,7 @@ process_tx_desc(E1000State *s, struct e1000_tx_desc *dp)
// context descriptor TSE is not set, while data descriptor TSE is set
DBGOUT(TXERR, "TCP segmentaion Error\n");
} else {
+ split_size = MIN(sizeof(tp->data) - tp->size, split_size);
cpu_physical_memory_read(addr, tp->data + tp->size, split_size);
tp->size += split_size;
}
--
1.7.7
