net: ne2000: fix bounds check in ioport operations

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 <liuling-it@360.cn>
Cc: qemu-stable@nongnu.org
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Signed-off-by: Jason Wang <jasowang@redhat.com>

diff --git a/hw/ne2000.c b/hw/ne2000.c
index 61d1305667f031c9ca835add25ffa10f1baf2822..b0b1ad9ac9e501c7adc313cc2123c00ab5a956ea 100644 (file)
--- a/hw/ne2000.c
+++ b/hw/ne2000.c
@@ -475,8 +475,9 @@ 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) <= NE2000_MEM_SIZE)) {
         cpu_to_le32wu((uint32_t *)(s->mem + addr), val);
     }
 }
@@ -505,8 +506,9 @@ 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) <= NE2000_MEM_SIZE)) {
         return le32_to_cpupu((uint32_t *)(s->mem + addr));
     } else {
         return 0xffffffff;