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[Qemu-devel] [PATCH v3] net: ne2000: fix bounds check in ioport operatio
From: |
P J P |
Subject: |
[Qemu-devel] [PATCH v3] net: ne2000: fix bounds check in ioport operations |
Date: |
Thu, 31 Dec 2015 17:05:27 +0530 |
From: Prasad J Pandit <address@hidden>
While doing ioport r/w operations, ne2000 device emulation suffers
from OOB r/w errors. Update respective array bounds check to avoid
OOB access.
Reported-by: Ling Liu <address@hidden>
Signed-off-by: Prasad J Pandit <address@hidden>
---
hw/net/ne2000.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
Updated as per review in
-> https://lists.gnu.org/archive/html/qemu-devel/2015-12/msg04863.html
diff --git a/hw/net/ne2000.c b/hw/net/ne2000.c
index 010f9ef..9dd0c67 100644
--- a/hw/net/ne2000.c
+++ b/hw/net/ne2000.c
@@ -467,8 +467,9 @@ static inline void ne2000_mem_writel(NE2000State *s,
uint32_t addr,
uint32_t val)
{
addr &= ~1; /* XXX: check exact behaviour if not even */
- if (addr < 32 ||
- (addr >= NE2000_PMEM_START && addr < NE2000_MEM_SIZE)) {
+ if (addr < 32
+ || (addr >= NE2000_PMEM_START
+ && addr + sizeof(uint32_t) - 1 < NE2000_MEM_SIZE)) {
stl_le_p(s->mem + addr, val);
}
}
@@ -497,8 +498,9 @@ static inline uint32_t ne2000_mem_readw(NE2000State *s,
uint32_t addr)
static inline uint32_t ne2000_mem_readl(NE2000State *s, uint32_t addr)
{
addr &= ~1; /* XXX: check exact behaviour if not even */
- if (addr < 32 ||
- (addr >= NE2000_PMEM_START && addr < NE2000_MEM_SIZE)) {
+ if (addr < 32
+ || (addr >= NE2000_PMEM_START
+ && addr + sizeof(uint32_t) - 1 < NE2000_MEM_SIZE)) {
return ldl_le_p(s->mem + addr);
} else {
return 0xffffffff;
--
2.4.3
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