syscall_fs: stop pipe() working with a r/o fs backing it

diff --git a/Kernel/syscall_fs.c b/Kernel/syscall_fs.c
index b4e0721..c4b1605 100644 (file)
--- a/Kernel/syscall_fs.c
+++ b/Kernel/syscall_fs.c
@@ -324,6 +324,11 @@ arg_t _pipe(void)
                goto nogood2;
        }
 
+       if (ino->c_flags & CRDONLY) {
+               udata.u_error = EROFS;
+               goto nogood3;
+       }
+
        udata.u_files[u2] = oft2;
 
        of_tab[oft1].o_ptr = 0;
@@ -345,6 +350,8 @@ arg_t _pipe(void)
        uputw(u2, fildes + 1);
        return (0);
 
+      nogood3:
+       i_deref(ino);
       nogood2:
        oft_deref(oft1);
        udata.u_files[u1] = NO_FILE;