[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PATCH] net: ne2000: fix bounds check in ioport operations
From: |
P J P |
Subject: |
[Qemu-devel] [PATCH] net: ne2000: fix bounds check in ioport operations |
Date: |
Wed, 30 Dec 2015 13:14:07 +0530 |
From: Prasad J Pandit <address@hidden>
While doing ioport r/w oprations, ne2000 device emulation suffers
from OOB r/w error. 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 | 34 ++++++++++++++++++++--------------
1 file changed, 20 insertions(+), 14 deletions(-)
diff --git a/hw/net/ne2000.c b/hw/net/ne2000.c
index 010f9ef..42e4804 100644
--- a/hw/net/ne2000.c
+++ b/hw/net/ne2000.c
@@ -447,9 +447,10 @@ static uint32_t ne2000_ioport_read(void *opaque, uint32_t
addr)
static inline void ne2000_mem_writeb(NE2000State *s, uint32_t addr,
uint32_t val)
{
- if (addr < 32 ||
- (addr >= NE2000_PMEM_START && addr < NE2000_MEM_SIZE)) {
- s->mem[addr] = val;
+ if (addr < 32
+ || (addr >= NE2000_PMEM_START
+ && addr <= NE2000_MEM_SIZE - sizeof(uint8_t))) {
+ s->mem[addr] = (uint8_t)val;
}
}
@@ -457,8 +458,9 @@ static inline void ne2000_mem_writew(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 <= NE2000_MEM_SIZE - sizeof(uint16_t))) {
*(uint16_t *)(s->mem + addr) = cpu_to_le16(val);
}
}
@@ -467,17 +469,19 @@ 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 <= NE2000_MEM_SIZE - sizeof(uint32_t))) {
stl_le_p(s->mem + addr, val);
}
}
static inline uint32_t ne2000_mem_readb(NE2000State *s, uint32_t addr)
{
- if (addr < 32 ||
- (addr >= NE2000_PMEM_START && addr < NE2000_MEM_SIZE)) {
- return s->mem[addr];
+ if (addr < 32
+ || (addr >= NE2000_PMEM_START
+ && addr <= NE2000_MEM_SIZE - sizeof(uint8_t))) {
+ return (uint8_t)s->mem[addr];
} else {
return 0xff;
}
@@ -486,8 +490,9 @@ static inline uint32_t ne2000_mem_readb(NE2000State *s,
uint32_t addr)
static inline uint32_t ne2000_mem_readw(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 <= NE2000_MEM_SIZE - sizeof(uint16_t))) {
return le16_to_cpu(*(uint16_t *)(s->mem + addr));
} else {
return 0xffff;
@@ -497,8 +502,9 @@ 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 <= NE2000_MEM_SIZE - sizeof(uint32_t))) {
return ldl_le_p(s->mem + addr);
} else {
return 0xffffffff;
--
2.4.3