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36559: test earlier for overflow in pattern range

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This commit is contained in:
Peter Stephenson 2015-09-19 23:08:46 +01:00
parent cc44b10da1
commit df0d86b847
3 changed files with 28 additions and 5 deletions
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23
Src/pattern.c
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@ -220,8 +220,10 @@ typedef union upat *Upat;
#if defined(ZSH_64_BIT_TYPE) || defined(LONG_IS_64_BIT)
typedef zlong zrange_t;
#define ZRANGE_T_IS_SIGNED (1)
#define ZRANGE_MAX ZLONG_MAX
#else
typedef unsigned long zrange_t;
#define ZRANGE_MAX ULONG_MAX
#endif
#ifdef MULTIBYTE_SUPPORT
@ -2641,19 +2643,30 @@ patmatch(Upat prog)
start = compend = patinput;
comp = 0;
while (patinput < patinend && idigit(*patinput)) {
if (comp)
comp *= 10;
comp += *patinput - '0';
int out_of_range = 0;
int digit = *patinput - '0';
if (comp > ZRANGE_MAX / (zlong)10) {
out_of_range = 1;
} else {
zrange_t c10 = comp ? comp * 10 : 0;
if (ZRANGE_MAX - c10 < digit) {
out_of_range = 1;
} else {
comp = c10;
comp += digit;
}
}
patinput++;
compend++;
if (comp & ((zrange_t)1 << (sizeof(comp)*8 -
if (out_of_range ||
(comp & ((zrange_t)1 << (sizeof(comp)*8 -
#ifdef ZRANGE_T_IS_SIGNED
2
#else
1
#endif
))) {
)))) {
/*
* Out of range (allowing for signedness, which
* we need if we are using zlongs).