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avoid overflow when doubling size

This commit is contained in:
Roberto Ierusalimschy 2003-11-27 16:18:37 -02:00
parent 8b97b072cd
commit da61624756
1 changed files with 11 additions and 8 deletions
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19
lmem.c
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@ -1,5 +1,5 @@
/* /*
** $Id: lmem.c,v 1.61 2002/12/04 17:38:31 roberto Exp roberto $ ** $Id: lmem.c,v 1.62 2003/10/02 20:31:17 roberto Exp roberto $
** Interface to Memory Manager ** Interface to Memory Manager
** See Copyright Notice in lua.h ** See Copyright Notice in lua.h
*/ */
@ -45,13 +45,16 @@
void *luaM_growaux (lua_State *L, void *block, int *size, int size_elems, void *luaM_growaux (lua_State *L, void *block, int *size, int size_elems,
int limit, const char *errormsg) { int limit, const char *errormsg) {
void *newblock; void *newblock;
int newsize = (*size)*2; int newsize;
if (newsize < MINSIZEARRAY) if (*size >= limit/2) { /* cannot double it? */
newsize = MINSIZEARRAY; /* minimum size */ if (*size >= limit - MINSIZEARRAY) /* try something smaller... */
else if (*size >= limit/2) { /* cannot double it? */ luaG_runerror(L, errormsg);
if (*size < limit - MINSIZEARRAY) /* try something smaller... */ newsize = limit; /* still have at least MINSIZEARRAY free places */
newsize = limit; /* still have at least MINSIZEARRAY free places */ }
else luaG_runerror(L, errormsg); else {
newsize = (*size)*2;
if (newsize < MINSIZEARRAY)
newsize = MINSIZEARRAY; /* minimum size */
} }
newblock = luaM_realloc(L, block, newblock = luaM_realloc(L, block,
cast(lu_mem, *size)*cast(lu_mem, size_elems), cast(lu_mem, *size)*cast(lu_mem, size_elems),