[hackers] [scc] [cc2-qbe] Fix writeout() without a function || Roberto E. Vargas Caballero

From: <git_AT_suckless.org>
Date: Sun, 12 Feb 2017 16:53:52 +0100 (CET)

commit 46f4fcce1a9d9715786442d3dad0ee87d868923f
Author: Roberto E. Vargas Caballero <k0ga_AT_shike2.com>
AuthorDate: Sun Feb 12 16:51:31 2017 +0100
Commit: Roberto E. Vargas Caballero <k0ga_AT_shike2.com>
CommitDate: Sun Feb 12 16:51:31 2017 +0100

    [cc2-qbe] Fix writeout() without a function
    
    Writeout() uses the curfun pointer without checking
    if we have a function. This generates a segmentation
    fault in this input:
    
            struct S { unsigned int a; };

diff --git a/cc2/arch/qbe/code.c b/cc2/arch/qbe/code.c
index 3c6f39d..d6cad6c 100644
--- a/cc2/arch/qbe/code.c
+++ b/cc2/arch/qbe/code.c
_AT_@ -340,6 +340,8 @@ writeout(void)
         char *sep, *name;
         int haslabel = 0;
 
+ if (!curfun)
+ return;
         if (curfun->kind == SGLOB)
                 fputs("export ", stdout);
         printf("function %s %s(", size2stack(&curfun->rtype), symname(curfun));
Received on Sun Feb 12 2017 - 16:53:52 CET