ref: ba13bc224be1dfd31711e500f66b51bca21188f4
parent: abe39da4407afac58b57173b8322936051c7bfa5
author: qwx <[email protected]>
date: Fri Aug 14 19:53:32 EDT 2020
util: fix erealloc always clearing extra space even if shrinking buffer erealloc is used here for arrays of structs and pointers with the assumption that extra elements are zeroed out when growing the buffer. overwriting memory unconditionally is obviously stupid.
--- a/util.c
+++ b/util.c
@@ -47,7 +47,8 @@
if((p = realloc(p, n)) == nil)
sysfatal("realloc: %r");setrealloctag(p, getcallerpc(&p));
- memset((uchar *)p + oldn, 0, n - oldn);
+ if(n > oldn)
+ memset((uchar *)p + oldn, 0, n - oldn);
return p;
}