diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index dce5cad..8296e5e 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -1140,11 +1140,19 @@
     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_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 @@
     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 @@
     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 @@
     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 @@
     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 @@
             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 {