[PATCH] load_elf_binary() oops fix

If we detect an error late in this function, local variable `interpreter' can
be NULL.  Don't try to fput() it in that case.

fs/binfmt_elf.c

@@ -863,7 +863,8 @@ static int load_elf_binary(struct linux_binprm * bprm, struct pt_regs * regs)
 	/* error cleanup */
 out_free_dentry:
 	allow_write_access(interpreter);
-	fput(interpreter);
+	if (interpreter)
+		fput(interpreter);
 out_free_interp:
 	if (elf_interpreter)
 		kfree(elf_interpreter);