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Fix potential integer overflow in getnum #3633

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merged 1 commit into from
Feb 18, 2024
Merged

Fix potential integer overflow in getnum #3633

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10 changes: 6 additions & 4 deletions app/modules/struct.c
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Original file line number Diff line number Diff line change
Expand Up @@ -99,12 +99,14 @@ typedef struct Header {
} Header;


static int getnum (const char **fmt, int df) {
static int getnum (lua_State *L, const char **fmt, int df) {
if (!isdigit(**fmt)) /* no number? */
return df; /* return default value */
else {
int a = 0;
do {
if (a > (INT_MAX / 10) || a * 10 > (INT_MAX - (**fmt - '0')))
luaL_error(L, "integral size overflow");
a = a*10 + *((*fmt)++) - '0';
} while (isdigit(**fmt));
return a;
Expand All @@ -127,9 +129,9 @@ static size_t optsize (lua_State *L, char opt, const char **fmt) {
case 'd': return sizeof(double);
#endif
case 'x': return 1;
case 'c': return getnum(fmt, 1);
case 'c': return getnum(L, fmt, 1);
case 'i': case 'I': {
int sz = getnum(fmt, sizeof(int));
int sz = getnum(L, fmt, sizeof(int));
if (sz > MAXINTSIZE)
luaL_error(L, "integral size %d is larger than limit of %d",
sz, MAXINTSIZE);
Expand Down Expand Up @@ -162,7 +164,7 @@ static void controloptions (lua_State *L, int opt, const char **fmt,
case '>': h->endian = BIG; return;
case '<': h->endian = LITTLE; return;
case '!': {
int a = getnum(fmt, MAXALIGN);
int a = getnum(L, fmt, MAXALIGN);
if (!isp2(a))
luaL_error(L, "alignment %d is not a power of 2", a);
h->align = a;
Expand Down
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