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5g: fix memory corruption

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R=ken2
CC=golang-dev
https://golang.org/cl/5666043
This commit is contained in:
Russ Cox 2012-02-14 01:13:14 -05:00
parent adb1a6ce3c
commit 1c987a321f
1 changed files with 2 additions and 2 deletions
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4
src/cmd/5g/gsubr.c
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@ -346,7 +346,7 @@ anyregalloc(void)
return 0; return 0;
} }
uintptr regpc[REGALLOC_RMAX+1]; uintptr regpc[REGALLOC_FMAX+1];
/* /*
* allocate register of type t, leave in n. * allocate register of type t, leave in n.
@ -451,7 +451,7 @@ regfree(Node *n)
if(n->op != OREGISTER && n->op != OINDREG) if(n->op != OREGISTER && n->op != OINDREG)
fatal("regfree: not a register"); fatal("regfree: not a register");
i = n->val.u.reg; i = n->val.u.reg;
if(i < 0 || i >= sizeof(reg)) if(i < 0 || i >= nelem(reg) || i >= nelem(regpc))
fatal("regfree: reg out of range"); fatal("regfree: reg out of range");
if(reg[i] <= 0) if(reg[i] <= 0)
fatal("regfree: reg not allocated"); fatal("regfree: reg not allocated");