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vim-patch:8.0.0219

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Problem:    Ubsan reports errors for integer overflow.
Solution:   Define macros for minimum and maximum values.  Select an
            expression based on the value. (Mike Williams)

7a40ea2138
This commit is contained in:
James McCoy
2017-01-23 12:55:27 -05:00
parent 55c93ea164
commit 2fb0a62553
3 changed files with 40 additions and 13 deletions
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41
src/nvim/charset.c
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@@ -1683,7 +1683,12 @@ void vim_str2nr(const char_u *const start, int *const prep, int *const len,
n += 2; // skip over "0b"
}
while ('0' <= *ptr && *ptr <= '1') {
un = 2 * un + (uvarnumber_T)(*ptr - '0');
// avoid ubsan error for overflow
if (un < UVARNUMBER_MAX / 2) {
un = 2 * un + (uvarnumber_T)(*ptr - '0');
} else {
un = UVARNUMBER_MAX;
}
ptr++;
if (n++ == maxlen) {
break;
@@ -1692,7 +1697,12 @@ void vim_str2nr(const char_u *const start, int *const prep, int *const len,
} else if ((pre == '0') || what == STR2NR_OCT + STR2NR_FORCE) {
// octal
while ('0' <= *ptr && *ptr <= '7') {
un = 8 * un + (uvarnumber_T)(*ptr - '0');
// avoid ubsan error for overflow
if (un < UVARNUMBER_MAX / 8) {
un = 8 * un + (uvarnumber_T)(*ptr - '0');
} else {
un = UVARNUMBER_MAX;
}
ptr++;
if (n++ == maxlen) {
break;
@@ -1705,7 +1715,12 @@ void vim_str2nr(const char_u *const start, int *const prep, int *const len,
n += 2; // skip over "0x"
}
while (ascii_isxdigit(*ptr)) {
un = 16 * un + (uvarnumber_T)hex2nr(*ptr);
// avoid ubsan error for overflow
if (un < UVARNUMBER_MAX / 16) {
un = 16 * un + (uvarnumber_T)hex2nr(*ptr);
} else {
un = UVARNUMBER_MAX;
}
ptr++;
if (n++ == maxlen) {
break;
@@ -1714,7 +1729,12 @@ void vim_str2nr(const char_u *const start, int *const prep, int *const len,
} else {
// decimal
while (ascii_isdigit(*ptr)) {
un = 10 * un + (unsigned long)(*ptr - '0');
// avoid ubsan error for overflow
if (un < UVARNUMBER_MAX / 10) {
un = 10 * un + (uvarnumber_T)(*ptr - '0');
} else {
un = UVARNUMBER_MAX;
}
ptr++;
if (n++ == maxlen) {
break;
@@ -1731,10 +1751,17 @@ void vim_str2nr(const char_u *const start, int *const prep, int *const len,
}
if (nptr != NULL) {
if (negative) {
// account for leading '-' for decimal numbers
*nptr = -(varnumber_T)un;
if (negative) { // account for leading '-' for decimal numbers
// avoid ubsan error for overflow
if (un > VARNUMBER_MAX) {
*nptr = VARNUMBER_MIN;
} else {
*nptr = -(varnumber_T)un;
}
} else {
if (un > VARNUMBER_MAX) {
un = VARNUMBER_MAX;
}
*nptr = (varnumber_T)un;
}
}