vim-patch:7.4.2225

Problem:    Crash when placing a sign in a deleted buffer.
Solution:   Check for missing buffer name. (Dominique Pelle). Add a test.

bfd096d020

src/nvim/ex_cmds.c

@@ -5675,6 +5675,10 @@ void ex_sign(exarg_T *eap)
 		}
 		else
 		{   // ... not currently in a window
+                    if (buf->b_fname == NULL) {
+                      EMSG(_("E934: Cannot jump to a buffer that does not have a name"));
+                      return;
+                    }
 		    char *cmd = xmalloc(STRLEN(buf->b_fname) + 25);
 		    sprintf(cmd, "e +%" PRId64 " %s",
                     (int64_t)lnum, buf->b_fname);