linux-user: return EINVAL on incorrect sockaddr

From: Lauro Ramos Venancio <lauro.venancio@gmail.com>

Fixes ltp test accept01
Signed-off-by: NRiku Voipio <riku.voipio@iki.fi>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6479 c046a42c-6fe2-441c-8c8c-71466251a162

linux-user/syscall.c

@@ -1140,11 +1140,19 @@ static abi_long do_socket(int domain, int type, int protocol)
     return get_errno(socket(domain, type, protocol));
 }
 
+/* MAX_SOCK_ADDR from linux/net/socket.c */
+#define MAX_SOCK_ADDR	128
+
 /* do_bind() Must return target values and target errnos. */
 static abi_long do_bind(int sockfd, abi_ulong target_addr,
                         socklen_t addrlen)
 {
-    void *addr = alloca(addrlen);
+    void *addr;
+
+    if (addrlen < 0 || addrlen > MAX_SOCK_ADDR)
+        return -TARGET_EINVAL;
+
+    addr = alloca(addrlen);
 
     target_to_host_sockaddr(addr, target_addr, addrlen);
     return get_errno(bind(sockfd, addr, addrlen));
@@ -1154,7 +1162,12 @@ static abi_long do_bind(int sockfd, abi_ulong target_addr,
 static abi_long do_connect(int sockfd, abi_ulong target_addr,
                            socklen_t addrlen)
 {
-    void *addr = alloca(addrlen);
+    void *addr;
+
+    if (addrlen < 0 || addrlen > MAX_SOCK_ADDR)
+        return -TARGET_EINVAL;
+
+    addr = alloca(addrlen);
 
     target_to_host_sockaddr(addr, target_addr, addrlen);
     return get_errno(connect(sockfd, addr, addrlen));
@@ -1226,6 +1239,9 @@ static abi_long do_accept(int fd, abi_ulong target_addr,
     if (get_user_u32(addrlen, target_addrlen_addr))
         return -TARGET_EFAULT;
 
+    if (addrlen < 0 || addrlen > MAX_SOCK_ADDR)
+        return -TARGET_EINVAL;
+
     addr = alloca(addrlen);
 
     ret = get_errno(accept(fd, addr, &addrlen));
@@ -1248,6 +1264,9 @@ static abi_long do_getpeername(int fd, abi_ulong target_addr,
     if (get_user_u32(addrlen, target_addrlen_addr))
         return -TARGET_EFAULT;
 
+    if (addrlen < 0 || addrlen > MAX_SOCK_ADDR)
+        return -TARGET_EINVAL;
+
     addr = alloca(addrlen);
 
     ret = get_errno(getpeername(fd, addr, &addrlen));
@@ -1273,6 +1292,9 @@ static abi_long do_getsockname(int fd, abi_ulong target_addr,
     if (get_user_u32(addrlen, target_addrlen_addr))
         return -TARGET_EFAULT;
 
+    if (addrlen < 0 || addrlen > MAX_SOCK_ADDR)
+        return -TARGET_EINVAL;
+
     addr = alloca(addrlen);
 
     ret = get_errno(getsockname(fd, addr, &addrlen));
@@ -1308,6 +1330,9 @@ static abi_long do_sendto(int fd, abi_ulong msg, size_t len, int flags,
     void *host_msg;
     abi_long ret;
 
+    if (addrlen < 0 || addrlen > MAX_SOCK_ADDR)
+        return -TARGET_EINVAL;
+
     host_msg = lock_user(VERIFY_READ, msg, len, 1);
     if (!host_msg)
         return -TARGET_EFAULT;
@@ -1340,6 +1365,10 @@ static abi_long do_recvfrom(int fd, abi_ulong msg, size_t len, int flags,
             ret = -TARGET_EFAULT;
             goto fail;
         }
+        if (addrlen < 0 || addrlen > MAX_SOCK_ADDR) {
+            ret = -TARGET_EINVAL;
+            goto fail;
+        }
         addr = alloca(addrlen);
         ret = get_errno(recvfrom(fd, host_msg, len, flags, addr, &addrlen));
     } else {