1 files changed, 7 insertions, 3 deletions

diff --git a/sys/vm/vm_unix.c b/sys/vm/vm_unix.c
index d5e9f58aab60..bea87f07be60 100644
--- a/sys/vm/vm_unix.c
+++ b/sys/vm/vm_unix.c
@@ -73,8 +73,14 @@ obreak(p, uap)
 
 	base = round_page((vm_offset_t) vm->vm_daddr);
 	new = round_page((vm_offset_t)uap->nsize);
+	old = base + ctob(vm->vm_dsize);
 	if (new > base) {
-		if ((new - base) > (unsigned) p->p_rlimit[RLIMIT_DATA].rlim_cur)
+		/*
+		 * We check resource limits here, but alow processes to
+		 * reduce their usage, even if they remain over the limit.
+		 */
+		if (new > old &&
+		    (new - base) > (unsigned) p->p_rlimit[RLIMIT_DATA].rlim_cur)
 			return ENOMEM;
 		if (new >= VM_MAXUSER_ADDRESS)
 			return (ENOMEM);
@@ -87,8 +93,6 @@ obreak(p, uap)
 		return EINVAL;
 	}
 
-	old = base + ctob(vm->vm_dsize);
-
 	if (new > old) {
 		vm_size_t diff;