sendit and recvit skip over 0-length vectors

SCCS-vsn: sys/kern/uipc_syscalls.c 6.2

diff --git a/usr/src/sys/kern/uipc_syscalls.c b/usr/src/sys/kern/uipc_syscalls.c
index f3f2392..8979f65 100644 (file)
--- a/usr/src/sys/kern/uipc_syscalls.c
+++ b/usr/src/sys/kern/uipc_syscalls.c
@@ -1,4 +1,4 @@
-/*     uipc_syscalls.c 6.1     83/07/29        */
+/*     uipc_syscalls.c 6.2     83/09/25        */

 
 #include "../h/param.h"
 #include "../h/systm.h"
 
 #include "../h/param.h"
 #include "../h/systm.h"


@@ -368,6 +368,8 @@ sendit(s, mp, flags)
                        u.u_error = EINVAL;
                        return;
                }
                        u.u_error = EINVAL;
                        return;
                }

+               if (iov->iov_len == 0)
+                       continue;

                if (useracc(iov->iov_base, (u_int)iov->iov_len, B_READ) == 0) {
                        u.u_error = EFAULT;
                        return;
                if (useracc(iov->iov_base, (u_int)iov->iov_len, B_READ) == 0) {
                        u.u_error = EFAULT;
                        return;


@@ -512,6 +514,8 @@ recvit(s, mp, flags, namelenp, rightslenp)
                        u.u_error = EINVAL;
                        return;
                }
                        u.u_error = EINVAL;
                        return;
                }

+               if (iov->iov_len == 0)
+                       continue;

                if (useracc(iov->iov_base, (u_int)iov->iov_len, B_WRITE) == 0) {
                        u.u_error = EFAULT;
                        return;
                if (useracc(iov->iov_base, (u_int)iov->iov_len, B_WRITE) == 0) {
                        u.u_error = EFAULT;
                        return;